747-400
MAINTENANCE MANUAL

SEE  A 
FWD APU COMPARTMENT  SEE  B 
A  FWD 
PLENUM INLET AIR  1.  ELECTRICAL CONNECTOR, D95009 (P9) INLET PRESSURE SENSOR 2. 3. PACKING 
ADAPTER 
FWD  B  NUT 
Figure 401 Inlet Pressure Sensor Installation 

L76704
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (d) Make sure you install all necessary protection covers.
 TASK 49-61-06-404-009
 3.  Inlet Pressure Sensor Installation (Fig. 401)
__________________________________
 A.  Consumable Materials
 (1)  D00418 Oil - Aircraft Turbine Engine
 B. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 2 | Air Pressure Sensor (Inlet | 49-61-06 | 01 | 5 | | | | Pressure Sensor (P1)) | | | | | | 3 | Packing | | | 7 | 2.......….......…...................................…...........…......….......1
 C.  Access
 (1)  
Location Zones 221 Control Cabin - Left 222 Control Cabin - Right 310 Fuselage - Station 2360 to Station 2792

 (2)  
Access Panels
 317AL APU Access Door - Left
 318AR APU Access Door - Right

 D.  
Procedure

 S 424-010
 CAUTION: MAKE SURE YOU DO NOT HIT THE AIR INLET PLENUM WITH YOUR HANDS
_______ OR YOUR TOOLS. DAMAGE TO THE AIR INLET PLENUM CAN OCCUR.
 CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY.
_______ IF YOU DO NOT REMOVE THE PROTECTION COVERS, DAMAGE TO THE APU CAN OCCUR.
 (1)  
Do these steps to install the inlet pressure sensor (2):

 (a)  
Lubricate the new packing (3) with a light coat of oil.

 (b)  
Install the packing (3) on the inlet pressure sensor (2).

 (c)  
Install the inlet pressure sensor (2) on the adapter.

 (d)  
Tighten the nut on the inlet pressure sensor (2) to 65-75 inch-pounds (7.3-8.5 newton-meters).

 (e)  
Do these steps to connect the electrical connector D95009 (P9)

 (1)
 to the inlet pressure sensor (2): 1) Connect the electrical connector D95009 (P9) (1) to the inlet pressure sensor (2).

 2)  Tighten the coupling ring on the electrical connector D95009 (P9) (1) until the electrical connector is at the bottom of the receptacle and the connection is tight.
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747-400 MAINTENANCE MANUAL
 3)  Make sure the electrical connection is not loose when you move the APU harness.
 E.  Put the Airplane Back to Its Usual Condition
 S 864-014
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT

 S 864-015
 (2)  
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.

 S 414-020

 (3)  
Close the left APU access door, 317AL, and right APU access door, 318AR:

 (a)  
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the right access door.

 (b)  
Install the two quick-release pins in the two brackets on the right APU compartment bulkhead.

 (c)  
Lift the right access door until you can install the lanyard on the pin at the aft APU compartment bulkhead.

 NOTE: The lanyard will hold the right access door on the APU
　
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