A320飞机维护手册 AMM 机载辅助动力 AIRBORNE AUXILIARY POWER 6(25)_航空信息_民用航空_通用航空

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No specific access platform 3.5 m (11 ft. 6 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through the Ground Connector 31-32-00-860-001 Procedure to Get Access to the SYSTEM REPORT/TEST
Menu Page 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access

3. Job Set-up
__________ Subtask 49-73-51-860-051
A. Aircraft Maintenance Configuration
(1)
Energize the ground service network
(Ref. TASK 24-42-00-861-001).

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

(3)
Make sure that there is 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 49-73-51-865-051
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-73-51-010-053
C. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.

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

(3)
Make sure that the light SW 11LJ is set to the ON position.

4. Procedure
_________ Subtask 49-73-51-420-050
A. Installation of the Encoder
NOTE : If replacement of the encoder is required, make sure that an

____ encoder which has been pre-programmed with the correct APU Serial Number is installed.
(1)
Install the encoder (2) with the screws (3) the washers (5) and the nuts (4) to the bracket (6).

(2)
Remove the blanking cap from the electrical connector (1).

(3)
Install the electrical connector (1) to the encoder (2). Subtask 49-73-51-865-052

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

-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-73-51-710-050
C. Do the BITE test of the encoder (Ref. TASK 31-32-00-860-001).
5. Close-up
________ Subtask 49-73-51-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.

(2)
Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).

(3)
Remove the access platform(s).

Subtask 49-73-51-860-052
B. Aircraft Maintenance Configuration
(1)
De-energize the ground service network
(Ref. TASK 24-42-00-862-001).

(2)
Pressurize the reservoirs of the hydraulic systems. (Ref. TASK 29-14-00-614-002).

(3)
Remove the warning notice(s).

EXHAUST - DESCRIPTION AND OPERATION
___________________________________

R **ON A/C 001-003, 051-099, 401-499,
1.
General

_______ The APU exhaust system ducts the engine exhaust gas overboard. Its secondary function is to decrease the exhaust noise level. To keep aerodynamic losses during APU operation to a minimum, the duct has a sufficiently large diameter. Also, the exhaust system discharge is positioned at the very aft end of the aircraft, where a low pressure area is generated during flight. Thus it is also made sure that exhaust gas does not re-enter the APU air intake system.

2.
Component Location

__________________
(Ref. Fig. 001)