Installation of the Automatic Direction Finder (ADF) Loop and Sense Antenna

TASK 34-53-11-400-001-A
Installation of the Automatic Direction Finder (ADF) Loop and Sense Antenna

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 240
FIN: 3RP1
FIN: 3RP2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 6M (20 FT)
No specific	Torque wrench: range to between 0.412 and 0.338 m.daN (36.46 and 29.91 lbf.in )
98L12003001000	1	HARNESS,SAFETY

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.04JAA3)	Top Coat Polyurethane_- - External Structure
(Material No.04QAB2)	Coating_- Flexible Structure
(Material No.04TMB2)	Varnish-- Electrical Bonding Structure
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -
(Material No.06ABF1)	Polysulfide Sealant-Fuel Tank Quick Curing -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
240	MID PASSENGER COMPARTMENT

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	O-RING	AIPC 34-53-11-05-010
4	GASKET	AIPC 34-53-11-05-040

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 34-53-00-710-002-A	Operational Test of the ADF
TASK 51-76-11-300-001-A	Repair of the Sealing
ADF Loop and Sense Antennas

3. Job Set-up
Subtask 34-53-11-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Put on a safety harness:

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

(a) Put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area.
(3) Make sure that the ACCESS PLATFORM 6M (20 FT) is in position.
(4) Make sure that the aircraft is in the same configuration as for the removal task.
(5) Make sure that the parts retained from the removed component are clean and in the correct condition.

Subtask 34-53-11-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/ADF/1	1RP1	H14
** ON A/C NOT FOR ALL
49VU	NAV PROBES/ADF/1	1RP1	F09
** ON A/C NOT FOR ALL
121VU	COM NAV/ADF/2	1RP2	K02

4. Procedure
Subtask 34-53-11-914-050-A

CAUTION: AFTER THREE DAYS OF FLIGHT WITHOUT SEALANT, DO THE FULL INSTALLATION OF THE ANTENNA:

REMOVE THE ANTENNA
CLEAN THE FUSELAGE AND ANTENNA SURFACES AND REMOVE ALL SIGNS OF HUMIDITY.

IF YOU DO NOT DO THIS, WATER CAN GO INTO THE STRUCTURE AND CORROSION CAN OCCUR.

CAUTION: AFTER TEN DAYS OF FLIGHT WITH INTERPOSITION SEALANT OR A GEL/ SILICON GASKET, DO THESE STEPS:

CLEAN THE AREA AROUND THE ANTENNA, AND
APPLY A SEALANT BEAD AROUND THE ANTENNA AND/OR SEALANT ON THE HEADS OF THE SCREWS.

IF YOU DO NOT DO THIS, WATER CAN GO INTO THE STRUCTURE AND CORROSION CAN OCCUR.

A. Aircraft Antenna Sealant-Exemption

If it is not possible to apply sealant and to wait until the sealant cure time is completed, refer to the subsequent table. The table gives the time limits to apply the sealant on the ADF loop and sense antenna.
These time limits are related to:

The antenna installation configuration
The antenna location
The risk of water infiltration
The sealant availability.

Configuration of the antenna installation	If the airline has sealant but does not want to wait until the sealant cure time is completed	If the airline has no sealant or gasket
No sealant (with Teflon gasket) between the antenna and the fuselage Sealing bead around the antenna Sealant on the heads of the screws O-ring on the antenna.	The aircraft can continue to fly for a maximum of 10 days without sealant on the heads of the screws if all the other sealants and gasket are installed.	The aircraft can continue to fly for a maximum of three days without sealant (interposition gasket, sealing bead and sealing on the heads of the screws) if the O-ring is installed. No exemption is possible if only the interposition gasket is installed (because of the risk of water infiltration between the aircraft and the antenna).

NOTE: When there is no sealing bead, there is a risk of aerodynamic noise.

Subtask 34-53-11-420-051-A ** ON A/C NOT FOR ALL

B. Installation of the Automatic Direction Finder (ADF) Loop and Sense Antenna
(1) Clean the component interface and/or the adjacent area with the Non Aqueous Cleaner-General - - (Material No.08BAA9) and a Textile-Lint free Cotton - (Material No.14SBA1) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Put the new AIPC 34-53-11-05-010 O-RING (3) in the correct position on the antenna.
(6) Put the new AIPC 34-53-11-05-040 GASKET (4) on the fuselage and align the bolt holes.
(7) Remove the masking tape from the coaxial cable (6) and connect the cable connector (5) to the antenna connector.
(8) Install the antenna (2) on the fuselage structure with the bolts (1).
(9) TORQUE the bolts (1) in a diagonally opposite sequence to between 0.412 and 0.338 m.daN (36.46 and 29.91 lbf.in )

NOTE: The antenna mounting bolts (1) and the holes (8) give the electrical bonding.

(10) Make sure that the bonding contact resistance between the antenna (2) and the fuselage structure is not more than 5 milliohms (Ref. AMM TASK 20-28-00-912-802).
(11) Apply a bead of the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) (7) or, as an alternative, the Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) , around the antenna (2) (Ref. AMM TASK 51-76-11-300-001) and on the fuselage.
(12) Fill the recesses of the bolts (1) with the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or, as an alternative, the Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) .
(13) Make the contour of the sealant on the bolts (1) and around the antenna (2) smooth.
(14) Let the sealant cure.
(15) Apply the Coating_- Flexible Structure (Material No.04QAB2) or the Top Coat Polyurethane_- - External Structure (Material No.04JAA3) on the sealant around the bottom of the antenna (2).

NOTE: It is not mandatory to paint the sealant that is around the bottom of the antenna and on the heads of the bolts.

(16) Apply the Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant on the heads of the bolts (1).

Subtask 34-53-11-420-051-B ** ON A/C NOT FOR ALL

NOTE: The antenna mounting bolts (1) and the holes (8) give the electrical bonding.

(10) Make sure that the bonding contact resistance between the antenna (2) and the fuselage structure is not more than 5 milliohms (Ref. AMM TASK 20-28-00-912-802).
(11) Apply a bead of the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) (7) or, as an alternative, the Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) , around the antenna (2) and on the fuselage (Ref. AMM TASK 51-76-11-300-001).
(12) Fill the recesses of the bolts (1) with the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or, as an alternative, the Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) .
(13) Make the contour of the sealant on the bolts (1) and around the antenna (2) smooth.
(14) Let the sealant cure.
(15) Apply the Coating_- Flexible Structure (Material No.04QAB2) or the Top Coat Polyurethane_- - External Structure (Material No.04JAA3) on the sealant around the bottom of the antenna (2).

NOTE: It is not mandatory to paint the sealant that is around the bottom of the antenna and on the heads of the bolts.

(16) Apply the Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant on the heads of the bolts (1).

Subtask 34-53-11-865-052-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	NAV/ADF/1	1RP1	H14
** ON A/C NOT FOR ALL
49VU	NAV PROBES/ADF/1	1RP1	F09
** ON A/C NOT FOR ALL
121VU	COM NAV/ADF/2	1RP2	K02

Subtask 34-53-11-710-050-A

D. Test
(1) Do the operational test of the ADF system (Ref. AMM TASK 34-53-00-710-002).

5. Close-up
Subtask 34-53-11-410-052-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).

Subtask 34-53-11-862-050-A

B. Put the aircraft back to its initial configuration.
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 04:06:08 UTC