DOC AIRBUS | AMM A320FSafety Precautions for the Operation of the APU (131-9(A))
TASK 49-00-00-910-003-A
Safety Precautions for the Operation of the APU (131-9(A))
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 49-00-00-941-068-A ** ON A/C NOT FOR ALL
Subtask 49-00-00-910-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 12:37:17 UTC
Safety Precautions for the Operation of the APU (131-9(A))
WARNING:
DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING:
WHILE THE APU OPERATES, DO NOT GO INTO THESE AREAS:
- THE AREA BEHIND THE APU EXHAUST DUCT: 25m (82ft.) REARWARD OF THE DUCT, MORE THAN 3m (10ft.) ABOVE THE GROUND, AND THE WIDTH OF THE HORIZONTAL STABILIZER
- THE AREA AROUND THE APU AIR-INTAKE: 2m (7ft) AROUND THE INTAKE
- THE AREA OF THE OIL-COOLER OUTLET.
WARNING:
DO NOT START THE APU WHEN THE AIRCRAFT IS IN THE HANGAR. WHEN THE APU OPERATES, THERE ARE RISKS OF INJURY FROM HIGH TEMPERATURES AND DANGEROUS FUMES (THAT CAN FILL THE HANGAR). MAKE SURE THAT PERSONS STAY AWAY FROM THE EXHAUST DUCT. THE EXHAUST DUCT IS DANGEROUS.
CAUTION:
DO NOT USE THE APU DURING FLUID DE-ICING OPERATIONS. DE-ICING FLUID CAN CONTAMINATE THE INSIDE OF THE APU.
CAUTION:
DO NOT START OR TRY TO START THE APU MORE THAN THREE TIMES, ONE AFTER THE OTHER. AFTER THE THIRD TIME, THERE MUST BE A MINIMUM OF ONE HOUR BEFORE YOU START OR TRY TO START THE APU AGAIN. THIS MAKES SURE THAT THE TEMPERATURE OF THE STARTER MOTOR DECREASES SUFFICIENTLY.
CAUTION:
DO NOT START THE APU WITH ACCESS DOORS 315AL AND 316AR OPEN/REMOVED.
THE APU FIRE EXTINGUISHER SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF THE ACCESS DOORS 315AL AND 316AR ARE OPEN/REMOVED.
CAUTION:
DO NOT TRY TO START THE APU AGAIN DURING A REFUEL/DEFUEL PROCEDURE AFTER AN AUTOMATIC SHUTDOWN OR FAILED APU START. IF YOU DO, THERE IS A RISK OF INJURY AND/OR DAMAGE.
CAUTION:
OBEY THE SAFETY PRECAUTIONS.
FIN: 4005KM ** ON A/C NOT FOR ALL
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 811 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 26-22-00-710-001-A | Operational Test of the APU Fire-Extinguishing Loop/Squib |
| TASK 28-22-00-710-001-A | Operational Test of the APU Fuel-Pump System on Ground to Purge the Fuel Line |
| TASK 52-41-00-010-002-A | Open the Avionics Compartment Doors for Access |
| TASK 52-41-00-410-001-A | Close the APU Doors after Access |
Dangerous areas at the running APU (131-9(A))Subtask 49-00-00-941-068-A ** ON A/C NOT FOR ALL
A. Not applicable
4. ProcedureSubtask 49-00-00-910-054-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Make sure that the forward avionic-compartment door 811 (Ref. AMM TASK 52-41-00-010-002) is open.
(a) Make sure that the WARNING NOTICE(S) is put in position on the opened forward avionic-compartment door 811 which tells persons not to close the door.
(3) Make sure that the APU is serviceable.
(4) Make sure that the APU fuel line bleeds correctly (Ref. AMM TASK 28-22-00-710-001) if it was drained to do a maintenance task since the last operation of the APU.
(5) Make sure that all blanking plugs and covers are removed.
(6) Make sure that the nose of the aircraft points into the wind.
(7) Make sure that the aircraft fuel system is serviceable and the fuel quantity is sufficient.
(8) Make sure that the APU fire and overheat detection system and the APU fire-extinguishing system are serviceable (Ref. AMM TASK 26-22-00-710-001).
(9) Do the APU shutdown immediately if you find a malfunction of the APU system during the operation. Correct the failure before you operate the APU again.
(10) If an emergency occurs, do the APU emergency shutdown immediately. You can start the emergency shutdown from:
(11) Make sure that the APU access doors 315AL and 316AR are closed correctly (Ref. AMM TASK 52-41-00-410-001).
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Make sure that the forward avionic-compartment door 811 (Ref. AMM TASK 52-41-00-010-002) is open.
(a) Make sure that the WARNING NOTICE(S) is put in position on the opened forward avionic-compartment door 811 which tells persons not to close the door.
(3) Make sure that the APU is serviceable.
(4) Make sure that the APU fuel line bleeds correctly (Ref. AMM TASK 28-22-00-710-001) if it was drained to do a maintenance task since the last operation of the APU.
(5) Make sure that all blanking plugs and covers are removed.
(6) Make sure that the nose of the aircraft points into the wind.
(7) Make sure that the aircraft fuel system is serviceable and the fuel quantity is sufficient.
(8) Make sure that the APU fire and overheat detection system and the APU fire-extinguishing system are serviceable (Ref. AMM TASK 26-22-00-710-001).
(9) Do the APU shutdown immediately if you find a malfunction of the APU system during the operation. Correct the failure before you operate the APU again.
(10) If an emergency occurs, do the APU emergency shutdown immediately. You can start the emergency shutdown from:
- the APU FIRE PUSH pushbutton switch on the panel 20VU,
- the APU SHUT OFF pushbutton switch on the panel 108VU.
NOTE: Do the APU emergency shutdown immediately if smoke, unusual noise, fuel or oil leakage occurs.
(a) Make sure that the fault which caused the emergency is corrected before you operate the APU again. (11) Make sure that the APU access doors 315AL and 316AR are closed correctly (Ref. AMM TASK 52-41-00-410-001).