A320飞机维护手册 AMM 机载辅助动力 AIRBORNE AUXILIARY POWER4(30)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
 Configuration before Maintenance Action 52-41-00-010-001 Open the APU Doors for Access 49-31-42-991-001 Fig. 201

 3. Job Set-up
__________ Subtask 49-31-42-860-054
 A. Aircraft Maintenance Configuration
 (1)
 Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 (2)
 On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.

 (3)
 Put a warning notice in the cockpit to tell persons not to start the APU.

 (4)
 Make sure that hydraulic systems are depressurized
 (Ref. TASK 29-00-00-864-001).

 Subtask 49-31-42-865-055
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
 Subtask 49-31-42-010-054
 C. Get Access
 (1)
 Put the access platform below the APU access doors 315AL and 316AR.

 (2)
 Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).

 (3)
 Set the LIGHT control switch 11LJ to the on position.

 4. Procedure
_________
 (Ref. Fig. 201/TASK 49-31-42-991-001) Subtask 49-31-42-020-052
 A. Removal of Nozzles and Manifold.
 (1)
 Put a container into position below the fuel manifold assembly.

 (2)
 Remove the bolt (6) and the nut (8) from the clamp (7).

 (3)
 Repeat step (1) at the three remaining clamp positions.

 (4)
 Disconnect the fuel manifold connector (4) at the nozzle (2).

 (5)
 Repeat step (3) at the five remaining main nozzle positions.

 (6)
 Disconnect the manifold connector (9) at the fuel flow divider and remove the manifold assembly.

 (7)
 Remove the bolts (3) from the nozzle assembly (2).

 (8)
 Remove the nozzles (2) and the gasket (1) from the mount boss (5).

 (9)
 Discard the gasket (1).

 (10)
 Repeat steps (6) thru (8) at the five remaining main nozzle positions.

 (11)
 Install approved blanking caps to all fuel tube ends and openings.

 (12)
 Remove the container.

 Main Fuel Nozzles and Manifold
 Figure 201/TASK 49-31-42-991-001

 CES  TASK 49-31-42-200-005 Inspection / Check of the Main Fuel Nozzles and Manifold (APS 3200) WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS

_______ WHEN YOU DO THE MAINTENANCE TASK(S).
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
49-31-42-000-003  Removal of the Main Fuel Nozzles and Manifold (APS 3200) 49-31-42-400-005 Installation of the Main Fuel Nozzles and Manifold (APS 3200) 49-31-42-991-001 Fig. 201
 3. Job Set-up
__________ (Ref. Fig. 201/TASK 49-31-42-991-001) Subtask 49-31-42-020-055
 A. Remove the main fuel nozzles and manifold (Ref. TASK 49-31-42-000-003)
 4. Procedure
_________ (Ref. Fig. 201/TASK 49-31-42-991-001) Subtask 49-31-42-210-053
 A. Inspection/Check of the Secondary Fuel Nozzles and Manifold
 (1)
 Inspect the manifold fuel tube insulation for splitting, hardening and porosity. None is permitted.

 (2)
 Make sure that the nozzle fuel-inlet connections (2) are not damaged, or blocked with carbon material.

 (3)
 Examine the nozzle mounting bosses (5) and make sure that they are clean and not damaged.

 (4)
 Examine the atomizer assembly for damage or carbon material. None is permitted.

 (5)
 Blow filtered air through each nozzle connection. Make sure that there are no blockages.