737-300 400 500 AMM 飞机维护手册 AIRBORNE AUXILIARY POWER 2(99)

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4)  Set the L PACK or the R PACK switch to ON and look at the duct pressure.
 (d)  
Make sure there is no duct pressure and that the APU EGT does not increase. 1) If there is no duct pressure and the EGT does not increase,

 the control switch, the load control thermostat, and the 3-way solenoid valve operate correctly.

 (e)  
If the control switch operation is irregular or it does not close the APU bleed valve, do these steps: 1) Do the APU usual shutdown (AMM 49-11-00/201). 2) Replace the control switch (Ref par. 2 and 3) or do the

 control switch deactivation (Ref par. 5).
 S 842-014
 (3)  Put the airplane back to its usual condition:
 (a)  
Do the APU usual shutdown (AMM 49-11-00/201).

 (b)  
Make sure the APU master switch, on the P5 forward overhead panel, is in the OFF position and attach a DO-NOT-OPERATE tag.

 (c)  
Connect the electrical connector to the J1 receptacle on the control switch.

 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, THE FIRE DETECTOR, THE CLAMPS, AND THE LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (d)  
Install the lower shroud: 1) Hold the lower shroud against the upper shroud. 2) Close the shroud latches.

 (e)  
Close the APU cowl door: 1) Disconnect the door support rods. 2) Put the door support rods in the clips on the APU cowl

 door. 3) Close the APU cowl door. 4) Close the latches for the APU cowl door.
 TASK 49-52-81-002-015
 5.  Overtemperature Control Switch Deactivation (Fig. 201)___________________________________________
 A.  Standard Tools and Equipment
 (1)  
Splice - NAS 1388 or the equivalent

 (2)  
Wire - BMS 13-31 Type 1, 18 gage, approximately 6 inches (16 cm)

 (3)  
Points - Contact, P/N BACC47DR1

 (4)  
Plug - Electrical, P/N BACC63BW10SLC4S (preferred)

 (5)  
Plug - Electrical, P/N FRF6E10SL4501 (optional)

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE OVERTEMPERATURE ú

 49-52-81
 CONTROL SWITCH  ú ú 02 Page 206 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B. Consumable Materials
 (1)  G01113 Tape - Electrical, Insulated
 C. References
 (1)  AMM 49-11-00/201, APU Power Plant
 D. Access
 (1)  
Location Zones
 101 Flight Compartment, LH
 205 Electronic Compartment
 703 APU Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 3804 APU Cowl Door

 

 E. Procedure
 S 862-016
 (1)  Set the switch and the circuit breaker:
 (a)  
Set the APU master switch, on the P5 forward overhead panel, to the OFF position and attach a DO-NOT-OPERATE tag.

 (b)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit

 S 012-017
 (2)  Open the APU cowl door:
 (a)  
Open the latches for the APU cowl door.

 (b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 012-018
 CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (3)  Remove the lower shroud:
 (a)  
Hold the lower shroud and open the shroud latches.

 (b)  
Remove the lower shroud.

 S 042-019
 (4)  Do the control switch deactivation (preferred procedure):
 (a)  
Disconnect the electrical connectors from the J1 receptacle and the J2 receptacle.

 (b)  
Remove pins B and D from the J2 receptacle connector.

 (c)  
Cut the wires from pins B and D.
 1) Discard the pins.

 

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH THE OVERTEMPERATURE ú

　
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