Installation of the Radio Altimeter Transceiver

TASK 34-42-33-400-001-A
Installation of the Radio Altimeter Transceiver

ZONE: 152
FIN: 2SA1
FIN: 2SA2

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
152	AFT CARGO COMPARTMENT
152GW, 826

B. Referenced Information

REFERENCE	DESIGNATION
TASK 22-97-00-710-001-A	Operational Test of the LAND CAT III Capability
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 25-55-11-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 25-55-11-400-003-A	Installation of the Sidewall Panels in the Aft Cargo Compartment - FR47/FR59
TASK 34-42-00-740-002-A	BITE Test of the Radio Altimeter
TASK 34-42-00-750-001-A	Operational Check and Detailed Inspection for Contamination of Radio Altimeter Fan
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Radio Altimeter Transceiver ** ON A/C NOT FOR ALL
Radio Altimeter Transceiver ** ON A/C NOT FOR ALL
Radio Altimeter Transceiver ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 34-42-33-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that aft cargo-compartment door 826 is open (Ref. AMM TASK 52-30-00-860-001).
(3) Make sure that access panel 152GW is removed (Ref. AMM TASK 25-55-11-000-003).

Subtask 34-42-33-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2SA1 (XCVRRA, 1)
121VU	COM NAV/RAD ALTM/1	1SA1	K11
FOR FIN: 2SA2 (XCVRRA, 2)
121VU	COM NAV/RAD ALTM/2	1SA2	K12

4. Procedure
Subtask 34-42-33-420-050-A

A. Installation of the Radio Altimeter Transceiver
(1) Clean the component interfaces and the adjacent area.
(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) Carefully install the radio altimeter transceiver (1) into the rack (2).
(6) Make sure that the radio altimeter transceiver (1) is correctly aligned to prevent damage to the electrical connectors (4).
(7) Lift the fasteners and tighten the knurled nuts (3) until the radio altimeter transceiver (1) is correctly attached.

Subtask 34-42-33-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 2SA1 (XCVRRA, 1)
121VU	COM NAV/RAD ALTM/1	1SA1	K11
FOR FIN: 2SA2 (XCVRRA, 2)
121VU	COM NAV/RAD ALTM/2	1SA2	K12

Subtask 34-42-33-740-050-A

C. Test
(1) Do the BITE test of the radio altimeter (Ref. AMM TASK 34-42-00-740-002).
(2) If the aircraft is in actual CAT 3 conditions, you must also do the LAND CAT III capability test (Ref. AMM TASK 22-97-00-710-001).
(3) Do the functional test of the radio altimeter fan (Ref. AMM TASK 34-42-00-750-001).

5. Close-up
Subtask 34-42-33-410-052-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install access panel 152GW (Ref. AMM TASK 25-55-11-400-003).
(3) Close aft cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-002).

Subtask 34-42-33-862-050-A

B. Aircraft Maintenance Configuration
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:23:24 UTC