NOTE:  Do not connect the bleed air line to the check valve at this time.

(b)  
Install the pneumatic line filter for the cooling air shutoff valve (AMM 49-51-22/401).

NOTE:  Do not connect the pressure line for the pneumatic actuator to the reducer at this time.
(2)  
Install the bleed air duct and temporarily secure bleed air duct to the APU compartment.

(3)  
Connect the bleed air line to the check valve for the fuel sensing flow control.

(4)  
Connect the pressure line for the pneumatic actuator to the reducer.

(5)  
Install the upper shroud (AMM 49-12-31/401).

NOTE:  The bleed air duct is connected to the upper shroud and the bleed air valve during the upper shroud installation.
501 
Feb 01/96  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-52-13 Page 401 

F46264
Bleed Air Duct Installation  501 
49-52-13Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 01/96 

DIFFERENTIAL AIR PRESSURE REGULATOR - UNIT SERVICING
1.  Equipment and Materials
A.  Solvent - B00062 Acetone, Turco
B.  Grease - MIL-G-6032
2.  Prepare for Differential Air Pressure Regulator Unit Servicing
A.  Position battery switch and APU master switch to OFF and placard that APU maintenance is "in work."
B.  Open the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
C.  Open APU compartment access door latches and open access door.
3.  Service Differential Air Pressure Regulator Filter (Fig. 301)
A.  Remove regulator air inlet line clamp.
B.  Remove regulator air inlet line from regulator and from bleed air valve.
C.  Remove cover from regulator housing and remove filter.
D.  Remove lock-o-seal (including retaining washer) and packing from regulator housing.
WARNING:  DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
E.  Clean filter element using Turco Transpo. Wash filter in acetone and dry with clean compressed air.
NOTE:  Older filter elements are threaded at the base; condition of threads for these elements is not significant as the threads are not used in this application.
F.  Coat external threads of air pressure regulator housing with grease.
G.  Install new lock-o-seal (including retaining washer) and new packing in regulator housing.
CAUTION:  ENSURE THAT THE CORRECT CONFIGURATION OF PACKING(S) IS USED OR DAMAGE TO FILTER ELEMENT COULD RESULT. DIFFERENTIAL AIR PRESSURE REGULATOR P/N 108032-3, USES TWO PACKINGS; P/N 108032-8 AND ON, USES ONE PACKING (FIG. 301).
H.  Position filter in cover with new packing(s); install cover on regulator housing and tighten to torque value of 75 to 85 pound-inches.
May 01/98 49-52-21 Page 301 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Differential Air Pressure Regulator Unit Servicing  500 
49-52-21  Figure 301  May 01/76 
Page 302 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

I. Install regulator air inlet line to regulator and to bleed air valve.
CAUTION:  LIMIT TORQUE ON REGULATOR AIR INLET LINE TO 65 POUND-INCHES OR FITTING MAY SHEAR FROM FILTER COVER.
J. Install regulator air inlet line clamp.
K. Test Differential Air Pressure Regulator (Ref Adjustment/Test).
4. Restore Airplane to Normal Configuration
A. Close and latch APU compartment access door.
B. Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
C. Remove placard and position battery switch and APU master switch to ON.
501 
May 01/76  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-52-21 Page 303 

DIFFERENTIAL AIR PRESSURE REGULATOR - REMOVAL/INSTALLATION
1.  Prepare for Differential Air Pressure Regulator Removal
A.  Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is "in work."
B.  Open the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
C.  Open APU compartment access door latches and open access door.
2.  Remove Differential Air Pressure Regulator (Fig. 401)
A.  Disconnect regulator air inlet line from regulator.
B.  Disconnect constant pressure control air line from regulator.
　
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