Installation of the GPS Active Antenna

TASK 34-36-16-400-001-B
Installation of the GPS Active Antenna

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

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: 220

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 6M (20 FT)
No specific	AR	SCRAPER - NON METALLIC

B. Consumable Materials

REFERENCE	DESIGNATION
(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
220	FWD CAB UTILITY AREAS

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
5	O-RING	AIPC 34-36-16-01-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 34-10-00-860-004-A	Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-02	Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
TASK 51-76-11-300-001-A	Repair of the Sealing
GPS Active Antenna ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 34-36-16-865-056-A ** ON A/C NOT FOR ALL

A. 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/MMR/1	42RT1	G12
121VU	COM NAV/MMR/2	42RT2	L07

Subtask 34-36-16-010-054-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 6M (20 FT) is in position at zone 220 to get access to the antenna.

4. Procedure
Subtask 34-36-16-914-052-B ** ON A/C NOT FOR ALL

CAUTION: AT OR BEFORE THE END OF THE APPLICABLE TIME LIMIT (3 OR 10 DAYS), IT IS NECESSARY TO DO THE FULL INSTALLATION:

REMOVE THE ANTENNA
CLEAN THE FUSELAGE AND ANTENNA SURFACES AND REMOVE ALL SIGNS OF HUMIDITY
INSTALL THE ANTENNA WITH FULL INSTALLATION OF THE SEALANT.

IF YOU DO NOT DO THIS, THERE IS A RISK OF WATER INFILTRATION AND CORROSION.

A. Aircraft antenna sealant-exemption
The table that follows gives the time limits for sealant installation for each radio-navigation, surveillance and communication antenna.
These limits are adapted to:

Antenna installation configuration
Antenna location
Antenna sensitivity to water infiltration
Sealant availability

(1) Aircraft Maintenance Configuration

Configuration of antenna installation	If the Airline has sealant but does not want to wait until the sealant is cured	If the Airline has no sealant available
No sealant between the antenna and the fuselage Sealing bead around the antenna Sealant on the heads of the screws O-ring at the antenna connector level	Authorization to fly up to 3 days without sealant (sealing bead + sealant on the heads of the screws) if the O-ring is installed.	Authorization to fly up to 3 days without sealant (sealing bead + sealant on the heads of the screws) if the O-ring is installed.
Sealant between the antenna and the fuselage (interposition sealant) Sealing bead around the antenna Sealant on the heads of the screws O-ring at the antenna connector level	Authorization to fly up to 10 days without sealing bead around the antenna if the interposition sealant was applied and the O-ring installed. Authorization to fly up to 10 days without sealant on the heads of the screws.	Authorization to fly up to 3 days without sealant (interposition sealant + sealing bead + sealant on the heads of the screws) if the O-ring is installed.

Subtask 34-36-16-420-052-B ** ON A/C NOT FOR ALL

B. Installation of the GPS Active Antenna without a Teflon Seal

GPS Active Antenna ** ON A/C NOT FOR ALL

(1) Remove the used sealant from the fuselage structure (3) with the SCRAPER - NON METALLIC.
(2) Clean the mating surfaces with the Non Aqueous Cleaner-General - - (Material No.08BAA9) and a Textile-Lint free Cotton - (Material No.14SBA1) .
(3) Do an inspection of the component interfaces and the adjacent area.
(a) On the antenna (1), make sure that there is no paint, sealant or corrosion in the recesses of the attachment screw heads.
(4) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).

NOTE: You will subsequently do the electrical bonding of the antenna (1) at the attachment screws (2).

(5) Make sure that the O-ring (5) is in good condition.
(a) If the O-ring is not in good condition, discard it and install the new AIPC 34-36-16-01-010 O-RING (5).
(6) Install the O-ring (5) in the correct position on the antenna (1).
(7) Remove the CAP-BLANKING from each electrical connector and receptacle.
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Connect the coaxial connector (4) to the connector of the antenna (1).
(10) Put the antenna (1) in position and install the screws (2).
(11) Tighten the screws (2) in a diagonal sequence.
(12) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(a) Make sure that the bonding contact resistance between the antenna (1) and the fuselage structure (3) is not more than 5 milliohms (Ref. AMM TASK 20-28-00-912-802).
(13) Make a sealing bead with the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or the Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) around the antenna (1) (Ref. AMM TASK 51-76-11-300-001).
(14) Apply the Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or the Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) on the heads of the screws (2).
(15) Make the contour of the sealant on the screws (2) and around the antenna (1) smooth.
(16) Let the sealant cure.
(17) Apply the Coating_- Flexible Structure (Material No.04QAB2) on the sealant around the bottom of the antenna (1).
(18) Apply the Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant on the heads of the screws (2).

Subtask 34-36-16-865-057-A ** ON A/C NOT FOR ALL

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/MMR/1	42RT1	G12
121VU	COM NAV/MMR/2	42RT2	L07

Subtask 34-36-16-710-052-A ** ON A/C NOT FOR ALL

D. Do the operational test of the GPS.
(1) Make sure that the IR system is aligned (Ref. AMM TASK 34-10-00-860-004).
(2) On one MCDU, push the DATA key to get the DATA INDEX page and then push the line key adjacent to the GPS MONITOR indication.
(3) On the GPS MONITOR page, after some minutes, make sure that:

the GPS1(2) POSITION indication is correct.
the TTRK indication shows dashes.
the MERIT indication shows between 0 and 100 m or 0 and 328.08 ft.
the GS indication shows approx. 000.
the MODE indication shows NAV.

NOTE: MERIT is an estimate of the 95% position accuracy of the position output by the GPS sensor.

(4) On the upper ECAM DU, make sure that there is no GPS fault message.
(5) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(6) Put the aircraft back to its initial configuration.

5. Close-up
Subtask 34-36-16-410-052-A ** ON A/C NOT FOR ALL

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).

[Rev.10 from 2021] 2026.04.01 01:00:33 UTC