Table of the Maximum Permitted Resistance-Values

TASK 20-28-00-869-002-A
Table of the Maximum Permitted Resistance-Values

1. Reason for the Job
This procedure gives:

The applicable resistance measurement test of the components or parts
And the maximum resistance values of the components or parts.

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-720-001-A	Check of the Electrical Bonding of the Different Components (but not Fluid Systems and Components Installed on Composite Materials) with a Millivoltmeter
TASK 20-28-00-720-005-A	Check of the Electrical Bonding of the Different Components (but not the Fluid Systems and Components Installed on Composite materials)
TASK 20-28-00-720-006-A	Check of the Electrical Bonding of the Fluid Systems
TASK 20-28-00-720-008-A	Check of the Electrical Bonding of the Different Components Installed on Composite Materials
TASK 20-28-00-720-010-A	Check of the Electrical Bonding of External Composite Panels with a Resistivity - Test Set
TASK 20-28-00-720-010-A-01	Check of the Electrical Bonding of Antenna Fairing (without Non-Conductive Finish paint) with a Megohmmeter
TASK 20-28-00-720-010-A-02	Check of the Electrical Bonding of Nose Radome with a Megohmmeter
TASK 20-28-00-720-010-A	Check of the Electrical Bonding of External Composite Panels with a Resistivity - Test Set
TASK 20-28-00-720-010-A-01	Check of the Electrical Bonding of Antenna Fairing (without Non-Conductive Finish paint) with a Megohmmeter
TASK 20-28-00-720-010-A-02	Check of the Electrical Bonding of Nose Radome with a Megohmmeter
TASK 20-28-00-720-011-A	Measurement of the Surface Electrical Resistance of External Composite Panels with a Resistivity Test Set
TASK 20-28-00-720-011-A-01	Measurement of the surface Electrical Resistance of External Composite Panels (without Non-Conductive Finish Paint) with Electrical Conductive Tape
TASK 20-28-00-720-011-A-02	Measurement of the Surface Electrical Resistance of External Composite Panels (without Non-Conductive Finish Paint) with Probes
TASK 20-28-00-720-011-A	Measurement of the Surface Electrical Resistance of External Composite Panels with a Resistivity Test Set
TASK 20-28-00-720-011-A-01	Measurement of the surface Electrical Resistance of External Composite Panels (without Non-Conductive Finish Paint) with Electrical Conductive Tape
TASK 20-28-00-720-011-A-02	Measurement of the Surface Electrical Resistance of External Composite Panels (without Non-Conductive Finish Paint) with Probes
TASK 20-28-00-720-012-A	Check of the Aircraft Electrical Grounding
TASK 20-28-00-720-012-A	Check of the Aircraft Electrical Grounding
TASK 20-28-00-720-014-A	Loop Impedance Test
TASK 20-28-00-720-014-A	Loop Impedance Test
TASK 20-28-00-720-802-A	Check of the Electrical Bonding of an External Composite Panel from a Dimple Washer with a Milliohmmeter
TASK 23-11-00-200-001-A	Check of the Electrical Bonding of the High Frequency (HF) System
Look-Up Table
Grounding Point Measurement Principles
Engine Bonding Lead Measurement Principle ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 20-28-00-941-063-A

A. Resistance Measurement Test Types
(1) To do a check of the resistance between the component and the structure:
(a) For components that contain fluids or gas and are installed in or out of an explosive atmosphere:

With a milliohmmeter, use the applicable procedure (Ref. AMM TASK 20-28-00-720-006).

(b) For other components that do not contain fluids or gas and are not installed on composite materials:
1 If installed in or out of an explosive atmosphere:

With a milliohmmeter, use the applicable procedure (Ref. AMM TASK 20-28-00-720-005).

2 Or if installed out of an explosive atmosphere:

With a variable power supply unit, an ammeter and a millivoltmeter, use the applicable procedure (Ref. AMM TASK 20-28-00-720-001).

(2) For components installed on composite materials, use the applicable procedure (Ref. AMM TASK 20-28-00-720-008).
(3) To do a check of the resistance between an external composite panel and the structure:
(a) For the composite panels and antenna fairing with or without non-conductive finish paint, use the applicable procedure:

With a resistivity-test set (Ref. AMM TASK 20-28-00-720-010).

(b) For an antenna fairing without non-conductive finish paint, use the applicable procedure (not applicable to nose radome):

With a resistivity-test set (Ref. AMM TASK 20-28-00-720-010) or
With a megohmmeter (Ref. AMM TASK 20-28-00-720-010).

NOTE: If the finish paint is applied on a panel or an antenna fairing, the measurement of the resistance is only possible with the resistivity-test set.

With a resistivity-test set (Ref. AMM TASK 20-28-00-720-010) or
With a megohmmeter (Ref. AMM TASK 20-28-00-720-010).

(d) Use the applicable procedure (Ref. AMM TASK 20-28-00-720-802) for the check of the electrical bonding of external composite panels from a dimple washer with a milliohmmeter.
Airbus recommends to measure the resistance with a resistivity-test set.
You can measure the resistance from a dimple washer with a milliohmmeter:

If you cannot use the resistivity-test set probe on the panel because of the panel shape, or
If it is not possible to measure the resistance with a resistivity-test set.

(4) For a surface resistance check on an external composite panel:

NOTE: The measurement of the surface electrical resistance is not necessary, if the panels are installed subsequently to their removal without modifications or repairs.

(a) Without non-conductive finish paint on the antistatic paint, use the applicable procedure:

With a resistivity-test set (Ref. AMM TASK 20-28-00-720-011) or
With electrical conductive tape (Ref. AMM TASK 20-28-00-720-011) or
With probes (Ref. AMM TASK 20-28-00-720-011).

(b) With non-conductive finish paint on the antistatic paint, use the applicable procedure:

With a resistivity-test set (Ref. AMM TASK 20-28-00-720-011).

(5) For a check of the aircraft electrical grounding, use the applicable procedure (Ref. AMM TASK 20-28-00-720-012).

NOTE: This procedure is used to measure the resistance between the ground and a landing gear leg.

(6) For a check of the electrical harness shielding or braid with a loop impedance tester, use the applicable procedure (Ref. AMM TASK 20-28-00-720-014).

4. Procedure
Subtask 20-28-00-869-103-A

A. Instructions Related to the Maximum-Resistance Value Table
(1) The tables from 1 to 15 give the maximum bonding resistance values for the components installed on the external surface of the aircraft or in the aircraft (pressurized or non-pressurized area).

NOTE: To find the applicable maximum resistance value of the bonded component, find the main location (column) and related system (row) from the illustration table.

Look-Up Table

The applicable location/system intersection gives the correct number of the resistance value table (from 1 to 15).

The measurement is done between each component specified in the table and the main adjacent structure.

NOTE: Some exceptions are given in tables 1 to 15.

(2) Specific table 16 gives the maximum resistance values for electromagnetic protection boxes and shielding conduits.
The measurement is done between each component specified in the table and the main adjacent structure with a milliohmmeter or with a loop tester.
(3) Specific table 17 gives the maximum resistance values for primary and secondary grounding points.
Table 17 is only applicable to bonding points.
The measurement is done on the lug that is connected to the structure, with:

One probe on the upper part of lug (connected to the structure)
One probe on the adjacent structure.
Grounding Point Measurement Principles

(4) Specific table 18 gives the maximum resistance value applicable for an aircraft ground check.
The measurement is done between a metallic plate under the tires and the aircraft main metallic-structure.
(5) Specific table 19 gives the maximum resistance values for the primary structure (applicable after a structural repair).
The measurement is done between each component specified in the table and Frame 1.

Subtask 20-28-00-869-104-A ** ON A/C NOT FOR ALL

B. Tables from 1 to 15 for Components and Surfaces

Look-Up Table ** ON A/C NOT FOR ALL

Do the measurement between the component and the main adjacent structure (except specified on the tables).

NOTE: * 100 milliohms for stainless steel or titanium material.

NOTE: ** Airbus recommends to measure the resistance with a resistivity-test set. If it is not possible, you can do the measurement with a milliohmmeter from a dimple washer.

(1) Table 1: External parts

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Sharklets: Between fixed metal structure at wing tip cap and wing structure (left and right)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Metal plate on wing leading edge	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Vent holes (NACA, Avionic ventilation doors, outflow valve, etc.)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Other fixed metal parts	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Pylon rear structure	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- For composite parts that include miscellaneous fairings (carbon composite or with antistatic coating) but not an antenna fairing or a radome	(a) With a resistivity-test set (Ref. AMM TASK 20-28-00-720-010)	100 Kohms
	(b) With a milliohmmeter for fairings with dimple washers ** (Ref. AMM TASK 20-28-00-720-802)	150 milliohms
- Antenna fairing or radome	(Ref. AMM TASK 20-28-00-720-010)	200 Megohms
- Antenna fairings (surface resistance of antistatic paint)	(Ref. AMM TASK 20-28-00-720-011)	between 5 and 100 Megohms square resistance
- Other fairings (flaps, fillet, etc.) (surface resistance of antistatic paint)	(Ref. AMM TASK 20-28-00-720-011)	50 Kohms square resistance
Static dischargers:
. Mounting base attached on metallic structure	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
. Mounting base attached on Carbon Fiber Reinforced Plastic (CFRP) structure	(Ref. AMM TASK 20-28-00-720-008)	50 Kohms
. Mounting base attached on CFRP structure of the sharklets (if installed)	(Ref. AMM TASK 20-28-00-720-008)	500 milliohms
. Mounting base attached on non-conductive composite structure or on antistatic paint	(Ref. AMM TASK 20-28-00-720-008)	500 Kohms

(2) Table 2: Doors, service and access panels (but not on pylon, engine, APU and landing gears)

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Cabin doors	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Metallic access doors/panels	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Tank access doors	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Cargo doors	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Potable water panel, and cargo service panels	(Ref. AMM TASK 20-28-00-720-005)	200 milliohms
- Toilet servicing panel electrically bonded with bonding braid	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms

(3) Table 3: Landing gear

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Lightning arrester strips at the edges of the landing gear doors	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Landing gear legs	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- MLG leg doors (metal)	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- NLG leg doors (metal)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Landing-gear lock assemblies	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Landing gear actuators	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Bonding strips of the landing gear doors	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms

(4) Table 4: Flight controls

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Frames and supports, but not transmission components	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Trailing edges of the control surfaces (elevators, rudder and ailerons)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Hinges of spoilers and ailerons	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Servocontrols	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Electrical and hydraulic components of high-lift system (flap and slat components)	(Ref. AMM TASK 20-28-00-720-005) or (Ref. AMM TASK 20-28-00-720-006)	20 milliohms
- Between the flap carriage and the adjacent flap bonding-lead bracket	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the flap track and the adjacent wing primary structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the flap track and the flap carriage	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Between the slat track and the adjacent slat bracket attachments (the slats)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the slat gear-box attachments and the adjacent wing primary structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the slat gear-box attachments and the slat tracks	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Slat lightning arrester strips	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms

(5) Table 5: Radome and antennas

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- End (fuselage side) of each radome lightning-arrester strip	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Communication and navigation antennas (HF antenna not included)	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- HF system (HF couplers not installed)	(Ref. AMM TASK 23-11-00-200-001)

(6) Table 6: Sensors and probes

NOTE: *** The measurement is done with the probe connector connected.

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Pitot probes ***	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Angle Of Attack (AOA) sensors ***	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Temperature probes ***	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Ice detector probes*** (if installed)	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms

(7) Table 7: External lights

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Engine scan lights	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Retractable lights and wing tip lights	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Engine air-inlet leading-edge light	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Other external lights	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms

(8) Table 8: Engine, nacelle and APU

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Fixed part of fan cowl attachment (cowl closed)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Fan cowl hinges	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- Nacelle doors and panels	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Engine and APU air intakes	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Engine and APU drains	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- APU generator (on connector screw)	(Ref. AMM TASK 20-28-00-720-005)	12 milliohms
- APU (on metal part)	(Ref. AMM TASK 20-28-00-720-005)	2 milliohms

(9) Table 9: Fuel system and other fluid systems or components in fuel compartment

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components (in or out of fuel tanks)	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Non-electrical components out of fuel tanks	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Non-electrical components in fuel tanks	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Stainless steel or titanium pipes	(Ref. AMM TASK 20-28-00-720-006)	100 milliohms
- Light alloy pipes	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Sequence valve	(Ref. AMM TASK 20-28-00-720-006)	100 milliohms
- Between bracket and adjacent structure	(Ref. AMM TASK 20-28-00-720-006)	5 milliohms
- Metallic rods	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(10) Table 10: Hydraulic and air systems

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Non-electrical components	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Metallic pipes, but not pipes below external composite panels in Trimmable Horizontal Stabilizer (THS) and fin area	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Pipes below external composite panels in THS and fin area	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(11) Table 11: Oxygen system

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Stainless steel components	(Ref. AMM TASK 20-28-00-720-006)	100 milliohms
- Light alloy components	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Pressure regulator/ transmitter on oxygen bottle	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
For passenger gaseous oxygen system in cabin (if installed): - Piping in overhead stowage compartment:
- Piping to adjacent primary structure	(Ref. AMM TASK 20-28-00-720-006)	20 milliohms
- Connection of two pipes (hose) through bonding jumper	(Ref. AMM TASK 20-28-00-720-006)	15 milliohms
- Connection of two pipes (T-coupling) through bonding jumper	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(12) Table 12: Other fluid systems

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Non-electrical components	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Metallic pipes	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Fire extinguisher bottles	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(13) Table 13: Inert Gas Generation System (IGGS)/ Fuel Tank Inerting System (FTIS) (if installed)

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- IGGS pallet system	(Ref. AMM TASK 20-28-00-720-006)	20 milliohms
- Upstream pipe between IGGS pallet and Conditioned Service Air System (CSAS)	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Oxygen Enriched Air (OEA) metallic pipe	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Nitrogen Enriched Air (NEA) pipe between IGGS pallet and Dual-Flapper Check Valve (DFCV)	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- DFCV	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- In-Tank Housing	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- IGGS pipes in fuel tank	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(14) Table 14: Electrical components and electrical cabinet components

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components not installed on rack and with bonding through the fasteners or bonding leads	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Electrical components with bonding through pin and cable	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Static inverters	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Transformer/rectifiers	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Transformers 115/26V	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Accelerometer	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- Brake pedal transmitter	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- Speedbrake control transducer unit 7CE	(Ref. AMM TASK 20-28-00-720-005)	120 milliohms
- Temperature sensor 24 HK	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- Weather radar control-unit (3SQ)	(Ref. AMM TASK 20-28-00-720-005)	70 milliohms
- Cockpit main instrument-panel, consoles, glareshield, center pedestal, overhead-panel	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Cockpit VU panels	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Cockpit electrical equipment casing	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Side sticks (CAPT, F/O)	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- CAPT and F/O seats	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- Third-occupant seat tracks that include a minimum of one electrical circuit	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- Emergency Locator Transmitter (ELT) beacon (bonding lead)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Electronic furniture used for bonding (measurement between furniture structure and aircraft structure)	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Electronic furniture not used for bonding (measurement between furniture structure and aircraft structure)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between primary structure of electrical cabinet and aircraft structure	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Between primary structure of electrical cabinet and secondary component of cabinet	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Aluminum grounding plates	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Stainless steel or titanium grounding plates	(Ref. AMM TASK 20-28-00-720-005)	3 milliohms
- Metal shelves (but not 105VU and 106VU)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- 105VU metal shelves	(Ref. AMM TASK 20-28-00-720-005)	20 milliohms
- 106VU metal shelves	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Carbon shelves:
. Metal support	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
. Center of the shelves	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms

(15) Table 15: Non-electrical components, furnishings and racks

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Between bracket and adjacent structure	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Belly fairing framework:
. In relation to aircraft structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
. Between two parts of metallic structure	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Carbon struts/rods:
. Between the strut or rods and the clamp junction	(Ref. AMM TASK 20-28-00-720-008)	20 Kohms
. Between the clamp and the structure junction	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Airstairs rails (if installed)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Airstairs hand rail (if installed)	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Cockpit seat tracks	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Cockpit protective covers and metal components (non-electrical)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Cockpit metal control components (pedals, handles, etc.)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Cockpit seat pick-up vertical leg (4th occupant)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Fluorescent lighting: ballast supports	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Hatracks (overhead stowage compartment)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Partitions (if installed with a bonding lead)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Metallic point on the toilet structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Toilet smoke detector	(Ref. AMM TASK 20-28-00-720-005)	70 milliohms
- Dummy windows	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Metallic point on the galley structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Measurement of monument/ cabinet bonding lead to primary structure:
. Space Flex V1 lavatory (if cabin flex)	(Ref. AMM TASK 20-28-00-720-014)	100 milliohms
. Space Flex V2 lavatory (if cabin flex)	(Ref. AMM TASK 20-28-00-720-014)	20 milliohms
. AFT complex	(Ref. AMM TASK 20-28-00-720-014)	20 milliohms
. Other monument/cabinet	(Ref. AMM TASK 20-28-00-720-014)	50 milliohms

Subtask 20-28-00-869-104-B ** ON A/C NOT FOR ALL

B. Tables from 1 to 15 for Components and Surfaces

Look-Up Table ** ON A/C NOT FOR ALL

Do the measurement between the component and the main adjacent structure (except specified on the tables).

NOTE: * 100 milliohms for stainless steel or titanium material.

NOTE: ** Airbus recommends to measure the resistance with a resistivity-test set. If it is not possible, you can do the measurement with a milliohmmeter from a dimple washer.

(1) Table 1: External parts

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Sharklets: Between fixed metal structure at wing tip cap and wing structure (left and right)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Metal plate on the wing leading edge	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Vent holes (NACA, avionic ventilation doors, outflow valve, etc.)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Other fixed metal parts	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Pylon rear structure	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- For composite parts that include miscellaneous fairings (carbon composite or with antistatic coating) but not an antenna fairing or a radome	(a) With a resistivity-test set (Ref. AMM TASK 20-28-00-720-010)	100 Kohms
	(b) With a milliohmmeter for fairings with dimple washers ** (Ref. AMM TASK 20-28-00-720-802)	150 milliohms
- Antenna fairing or radome	(Ref. AMM TASK 20-28-00-720-010)	200 Megohms
- Antenna fairings (surface resistance of antistatic paint)	(Ref. AMM TASK 20-28-00-720-011)	Between 5 and 100 Megohms square resistance
- Other fairings (flaps, fillet, etc.) (surface resistance of antistatic paint)	(Ref. AMM TASK 20-28-00-720-011)	50 Kohms square resistance
Static dischargers:
. Mounting base attached on metallic structure	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
. Mounting base attached on Carbon Fiber Reinforced Plastic (CFRP) structure	(Ref. AMM TASK 20-28-00-720-008)	50 Kohms
. Mounting base attached on CFRP structure of the sharklets (if installed)	(Ref. AMM TASK 20-28-00-720-008)	500 milliohms
. Mounting base attached on non-conductive composite structure or on antistatic paint	(Ref. AMM TASK 20-28-00-720-008)	500 Kohms

(2) Table 2: Doors, service and access panels (but not on pylon, engine, APU and landing gears)

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Cabin doors	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Metallic access doors/panels	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Tank access doors	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Cargo doors	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Potable water panel, and cargo service panels	(Ref. AMM TASK 20-28-00-720-005)	200 milliohms
- Toilet servicing panel electrically bonded with bonding braid	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms

(3) Table 3: Landing gear

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Lightning arrester strips at the edges of the landing gear doors	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Landing gear legs	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- MLG leg doors (metal)	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- NLG leg doors (metal)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Landing-gear lock assemblies	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Landing gear actuators	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Bonding strips of the landing gear doors	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms

(4) Table 4: Flight controls

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Frames and supports, but not transmission components	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Trailing edges of the control surfaces (elevators, rudder and ailerons)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Hinges of spoilers and ailerons	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Servocontrols	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Electrical and hydraulic components of high-lift system (flap and slat components)	(Ref. AMM TASK 20-28-00-720-005) or (Ref. AMM TASK 20-28-00-720-006)	20 milliohms
- Between the flap carriage and the adjacent flap bonding-lead bracket	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the flap track and the adjacent wing primary structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the flap track and the flap carriage	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Between the slat track and the adjacent slat bracket attachments (the slats)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the slat gear-box attachments and the adjacent wing primary structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between the slat gear-box attachments and the slat tracks	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Slat lightning-arrester strips	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms

(5) Table 5: Radome and antennas

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- End (fuselage side) of each radome lightning-arrester strip	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Communication and navigation antennas (HF antenna not included)	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- HF system (HF couplers not installed)	(Ref. AMM TASK 23-11-00-200-001)

(6) Table 6: Sensors and probes

NOTE: *** The measurement is done with the probe connector connected.

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Pitot probes ***	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Angle Of Attack (AOA) sensors ***	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Temperature probes ***	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Ice detector probes*** (if installed)	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms

(7) Table 7: External lights

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Engine scan lights	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Retractable lights and wing tip lights	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Engine air-inlet leading-edge- light	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Other external lights	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms

(8) Table 8: Engine, nacelle and APU

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Fixed part of fan cowl attachment (cowl closed)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Fan cowl hinges	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- Nacelle doors and panels	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Engine and APU air intakes	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Engine and APU drains	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms *
- Pylon bonding strap to thrust reverser cowl Engine Bonding Lead Measurement Principle ** ON A/C NOT FOR ALL	(Ref. AMM TASK 20-28-00-720-005)	0.5 milliohms
- Pylon bonding strap to fan cowl Engine Bonding Lead Measurement Principle ** ON A/C NOT FOR ALL	(Ref. AMM TASK 20-28-00-720-005)	0.5 milliohms
- Pylon bonding strap to inlet aft bulkhead Engine Bonding Lead Measurement Principle ** ON A/C NOT FOR ALL	(Ref. AMM TASK 20-28-00-720-005)	0.5 milliohms
- APU generator (on connector screw)	(Ref. AMM TASK 20-28-00-720-005)	12 milliohms
- APU (on metal part)	(Ref. AMM TASK 20-28-00-720-005)	2 milliohms

(9) Table 9: Fuel system and other fluid systems or components in fuel compartment

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components (in or out of fuel tanks)	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Non-electrical components out of fuel tanks	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Non-electrical components in fuel tanks	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Stainless steel or titanium pipes	(Ref. AMM TASK 20-28-00-720-006)	100 milliohms
- Light alloy pipes	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Sequence valve	(Ref. AMM TASK 20-28-00-720-006)	100 milliohms
- Between bracket and adjacent structure	(Ref. AMM TASK 20-28-00-720-006)	5 milliohms
- Metallic rods	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(10) Table 10: Hydraulic and air systems

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Non-electrical components	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Metallic pipes, but not pipes below external composite panels in Trimmable Horizontal Stabilizer (THS) and fin area	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Pipes below external composite panels in THS and fin area	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(11) Table 11: Oxygen system

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Stainless steel components	(Ref. AMM TASK 20-28-00-720-006)	100 milliohms
- Light alloy components	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Pressure regulator/ transmitter on oxygen bottle	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
For passenger gaseous-oxygen system in cabin (if installed): - Piping in overhead stowage compartment:
- Piping to adjacent primary structure	(Ref. AMM TASK 20-28-00-720-006)	20 milliohms
- Connection of two pipes (hose) through the bonding jumper	(Ref. AMM TASK 20-28-00-720-006)	15 milliohms
- Connection of two pipes (T-coupling) through the bonding jumper	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(12) Table 12: Other fluid systems

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components	(Ref. AMM TASK 20-28-00-720-006)	50 milliohms
- Non-electrical components	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Metallic pipes	(Ref. AMM TASK 20-28-00-720-006)	500 milliohms
- Fire extinguisher bottles	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(13) Table 13: Inert Gas Generation System (IGGS)/ Fuel Tank Inerting System (FTIS) (if installed)

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- IGGS pallet system	(Ref. AMM TASK 20-28-00-720-006)	20 milliohms
- Upstream pipe between IGGS pallet and Conditioned Service Air System (CSAS)	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Oxygen Enriched Air (OEA) metallic pipe	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- Nitrogen Enriched Air (NEA) pipe between IGGS pallet and Dual-Flapper Check Valve (DFCV)	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- DFCV	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- In-Tank Housing	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms
- IGGS pipes in fuel tank	(Ref. AMM TASK 20-28-00-720-006)	10 milliohms

(14) Table 14: Electrical components and electrical cabinet components

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Electrical components not installed on rack and with bonding through the fasteners or bonding leads	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Electrical components with bonding through pin and cable	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Static inverters	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Transformer/rectifiers	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Transformers 115/26V	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Accelerometer	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- Brake pedal transmitter	(Ref. AMM TASK 20-28-00-720-005)	100 milliohms
- Speedbrake control transducer- unit 7CE	(Ref. AMM TASK 20-28-00-720-005)	120 milliohms
- Temperature sensor 24 HK	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- Weather radar control-unit (3SQ)	(Ref. AMM TASK 20-28-00-720-005)	70 milliohms
- Cockpit Main instrument-panel, consoles, glareshield, center pedestal, overhead-panel	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Cockpit VU panels	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Cockpit electrical-equipment casing	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Side sticks (CAPT, F/O)	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- CAPT and F/O seats	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- Third-occupant seat tracks that include a minimum of one electrical circuit	(Ref. AMM TASK 20-28-00-720-005)	150 milliohms
- Emergency Locator Transmitter (ELT) beacon (bonding lead)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Electronic furniture used for bonding (measurement between furniture structure and aircraft structure)	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Electronic furniture not used for bonding (measurement between furniture structure and aircraft structure)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Between primary structure of electrical cabinet and aircraft structure	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Between primary structure of electrical cabinet and secondary component of cabinet	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Aluminum grounding plates	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Stainless steel or titanium grounding plates	(Ref. AMM TASK 20-28-00-720-005)	3 milliohms
- Metal shelves (but not 105VU and 106VU)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- 105VU metal shelves	(Ref. AMM TASK 20-28-00-720-005)	20 milliohms
- 106VU metal shelves	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Carbon shelves:
. Metal support	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
. Center of the shelves	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms

(15) Table 15: Non-electrical components, furnishings and racks

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Between bracket and adjacent structure	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Belly fairing framework:
. In relation to aircraft structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
. Between two parts of metallic structure	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
- Carbon struts/rods:
. Between the strut or rods and the clamp junction	(Ref. AMM TASK 20-28-00-720-008)	20 Kohms
. Between the clamp and the structure junction	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Airstairs rails (if installed)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Airstairs hand rail (if installed)	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Cockpit seat tracks	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Cockpit protective covers and metal components (non-electrical)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Cockpit metal-control components (pedals, handles, etc.)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Cockpit-seat pick-up vertical-leg (4th occupant)	(Ref. AMM TASK 20-28-00-720-005)	500 milliohms
- Fluorescent lighting: Ballast supports	(Ref. AMM TASK 20-28-00-720-005)	50 milliohms
- Hatracks (overhead stowage compartment)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Partitions (if installed with a bonding lead)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Metallic point on the toilet structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Toilet smoke detector	(Ref. AMM TASK 20-28-00-720-005)	70 milliohms
- Dummy windows	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Metallic point on the galley structure	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Measurement of monument/ cabinet bonding lead to primary structure:
. Space Flex V1 lavatory (if cabin flex)	(Ref. AMM TASK 20-28-00-720-014)	100 milliohms
. Space Flex V2 lavatory (if cabin flex)	(Ref. AMM TASK 20-28-00-720-014)	20 milliohms
. AFT complex	(Ref. AMM TASK 20-28-00-720-014)	20 milliohms
. Other monument/cabinet	(Ref. AMM TASK 20-28-00-720-014)	50 milliohms

Subtask 20-28-00-869-105-A

C. Table 16: Electromagnetic Protection Boxes and Shielding Conduits
(1) Measurement with a milliohmmeter

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- End of shielding conduits:
Conduit size code between 06 and 14:
. Length less than or equal to 0.3 m (0.98 ft.)	(Ref. AMM TASK 20-28-00-720-005)	3.5 milliohms
. Length more than 0.3 m (0.98 ft.) and less than or equal to 2 m (6.56 ft.)	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
. Length more than 2 m (6.56 ft.)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
Conduit size code between 16 and 20:
. Length less than or equal to 0.5 m (1.64 ft.)	(Ref. AMM TASK 20-28-00-720-005)	3.5 milliohms
. Length more than 0.5 m (1.64 ft.) and less than or equal to 2.5 m (8.20 ft.)	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
. Length more than 2.5 m (8.20 ft.)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
Conduit size code between 24 and 32:
. Length less than or equal to 1 m (3.28 ft.)	(Ref. AMM TASK 20-28-00-720-005)	3.5 milliohms
. Length more than 1 m (3.28 ft.) and less than or equal to 4.5 m (14.76 ft.)	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
. Length more than 4.5 m (14.76 ft.)	(Ref. AMM TASK 20-28-00-720-005)	10 milliohms
- Boxes and support plates	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- Metal raceways	(Ref. AMM TASK 20-28-00-720-005)	2.5 milliohms

(2) Measurement with a loop tester

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Raceways:	(Ref. AMM TASK 20-28-00-720-014)	10 milliohms
- For the braided conduits:
. In the wing areas	(Ref. AMM TASK 20-28-00-720-014)	200 milliohms
. At the interface area between the fuselage and the wing	(Ref. AMM TASK 20-28-00-720-014)	200 milliohms
. At the interface area between the fuselage and the horizontal tail plane	(Ref. AMM TASK 20-28-00-720-014)	200 milliohms
. At the interface area between the wing and the pylon	(Ref. AMM TASK 20-28-00-720-014)	200 milliohms
. In the vertical tail plane area and at the interface area between the vertical tail plane and the fuselage (but not for 4202VB, 4204VB 7103VC, 7135VC, 7112VC and 7148VC)	(Ref. AMM TASK 20-28-00-720-014)	25 milliohms
. For braided conduits: 4202VB, 4204VB, 7103VC, 7135VC, 7112VC and 7148VC	(Ref. AMM TASK 20-28-00-720-014)	100 milliohms
. In the MLG	(Ref. AMM TASK 20-28-00-720-014)	400 milliohms
- For the rigid conduit on the MLG	(Ref. AMM TASK 20-28-00-720-014)	200 milliohms

Subtask 20-28-00-869-106-A

D. Table 17: Grounding Points and Current Return
(1) Primary grounding points
(a) The values given are for measurement between the adjacent metal structure of the grounding point and the top end of the grounding lead of the equipment items that follow:

Grounding Point Measurement Principles

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- AC generators	(Ref. AMM TASK 20-28-00-720-005)	0.05 milliohms
- APU generator	(Ref. AMM TASK 20-28-00-720-005)	0.05 milliohms
- Emergency generator	(Ref. AMM TASK 20-28-00-720-005)	0.1 milliohms

(2) Secondary grounding points
(a) The values given are for measurement between the adjacent metal structure of the grounding point and the top end of the grounding lead or on the grounding module that follows:

Grounding Point Measurement Principles

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
. Steel, stainless steel and titanium material	(Ref. AMM TASK 20-28-00-720-005)	1 milliohm
. Light alloy material	(Ref. AMM TASK 20-28-00-720-005)	0.1 milliohms

Subtask 20-28-00-869-107-A

E. Table 18: Aircraft Grounding
(1) The measurement is done between a metallic plate under the tires and the aircraft main metallic structure

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- Landing gear leg	(Ref. AMM TASK 20-28-00-720-012)	10 Megohms

Subtask 20-28-00-869-108-A

F. Table 19: Primary Structure
(1) The values given are for measurement between the primary metal structure of Frame 1 and a metal part of the points that follow:

POINT LOCATION	TASK REFERENCE	MAX. PERMITTED RESISTANCE VALUE
- End of the wing	(Ref. AMM TASK 20-28-00-720-005)	2 milliohms
- End of the rear fuselage	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms
- End of the Trimmable Horizontal Stabilizer (THS) (measurement on one head of the two rivets)	(Ref. AMM TASK 20-28-00-720-005)	6 milliohms
- THS bonding braids	(Ref. AMM TASK 20-28-00-720-005)	2 milliohms
- Lower part of the vertical stabilizer	(Ref. AMM TASK 20-28-00-720-005)	5 milliohms

[Rev.10 from 2021] 2026.04.01 04:04:22 UTC