DOC AIRBUS | AMM A320FCleaning of the Radio Altimeter Transceiver Fan
TASK 34-42-45-100-001-A
Cleaning of the Radio Altimeter Transceiver Fan
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 34-42-45-861-051-A Subtask 34-42-45-865-053-A
Subtask 34-42-45-020-053-A
Subtask 34-42-45-410-052-A
[Rev.10 from 2021]
2026.04.02 06:23:24 UTC
Cleaning of the Radio Altimeter Transceiver Fan
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 2M (6 FT) |
| No specific | 1 | BLOWING EQUIPMENT - DRY AIR |
| No specific | 1 | BRUSH - NON METALLIC, SOFT |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 152HW, 826 |
| 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 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 34-42-33-000-001-A | Removal of the Radio Altimeter Transceiver |
| TASK 34-42-33-400-001-A | Installation of the Radio Altimeter Transceiver |
| TASK 34-42-45-000-001-A | Removal of the Radio Altimeter-Transceiver Fan |
| TASK 34-42-45-400-001-A | Installation of the Radio Altimeter-Transceiver 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 |
Subtask 34-42-45-861-051-A Subtask 34-42-45-865-053-A
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 34-42-45-010-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| FOR FIN: 3SA1 (FANRA XCVR1) | |||
| 121VU | COM NAV/RAD ALTM/1 | 1SA1 | K11 |
| FOR FIN: 3SA2 (FANRA XCVR2) | |||
| 121VU | COM NAV/RAD ALTM/2 | 1SA2 | K12 |
C. Get Access
(1) Open the AFT Cargo Door 826 (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) at the aft cargo door 826.
(3) Remove the access panel 152HW.
4. Procedure(1) Open the AFT Cargo Door 826 (Ref. AMM TASK 52-30-00-860-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) at the aft cargo door 826.
(3) Remove the access panel 152HW.
Subtask 34-42-45-020-053-A
A. Remove the radio altimeter units
(1) Remove the radio altimeter transceiver (Ref. AMM TASK 34-42-33-000-001).
(2) Remove the radio altimeter transceiver fan (Ref. AMM TASK 34-42-45-000-001).
Subtask 34-42-45-100-052-A (1) Remove the radio altimeter transceiver (Ref. AMM TASK 34-42-33-000-001).
(2) Remove the radio altimeter transceiver fan (Ref. AMM TASK 34-42-45-000-001).
B. Cleaning
(1) Use the BLOWING EQUIPMENT - DRY AIR and/or the BRUSH - NON METALLIC, SOFT to clean the fan or the fan housing:
(a) Make sure that the fan and the fan housing are blocked when you use the blowing equipment. Cleaning with the blowing equipment can cause exessive fan rotation speed and thus fan failure.
Subtask 34-42-45-420-051-A (1) Use the BLOWING EQUIPMENT - DRY AIR and/or the BRUSH - NON METALLIC, SOFT to clean the fan or the fan housing:
(a) Make sure that the fan and the fan housing are blocked when you use the blowing equipment. Cleaning with the blowing equipment can cause exessive fan rotation speed and thus fan failure.
C. Install the radio altimeter units
(1) Install the radio altimeter transceiver fan (Ref. AMM TASK 34-42-45-400-001).
(2) Install the radio altimeter transceiver (Ref. AMM TASK 34-42-33-400-001).
Subtask 34-42-45-865-054-A (1) Install the radio altimeter transceiver fan (Ref. AMM TASK 34-42-45-400-001).
(2) Install the radio altimeter transceiver (Ref. AMM TASK 34-42-33-400-001).
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 34-42-45-710-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| FOR FIN: 3SA1 (FANRA XCVR1) | |||
| 121VU | COM NAV/RAD ALTM/1 | 1SA1 | K11 |
| FOR FIN: 3SA2 (FANRA XCVR2) | |||
| 121VU | COM NAV/RAD ALTM/2 | 1SA2 | K12 |
E. Do the test
(1) Do the fan test of the radio altimeter system (Ref. AMM TASK 34-42-00-750-001).
(2) Do the Bite test of the radio altimeter (Ref. AMM TASK 34-42-00-740-002).
5. Close-up(1) Do the fan test of the radio altimeter system (Ref. AMM TASK 34-42-00-750-001).
(2) Do the Bite test of the radio altimeter (Ref. AMM TASK 34-42-00-740-002).
NOTE: If the aircraft is operated in actual CAT 3 conditions, you must also do the LAND CAT III capabillity test (Ref. AMM TASK 22-97-00-710-001).
Subtask 34-42-45-410-052-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 152HW.
(3) Remove the access platform(s).
(4) Close the AFT Cargo Door 826 (Ref. AMM TASK 52-30-00-860-002).
Subtask 34-42-45-862-051-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 152HW.
(3) Remove the access platform(s).
(4) Close the AFT Cargo Door 826 (Ref. AMM TASK 52-30-00-860-002).