Cooling Air Shutoff Valve Pneumatic Line Filter Installation 500
49-51-22 Figure 401 May 15/73
Page 402
COOLING AIR SHUTOFF VALVE PNEUMATIC LINE FILTER - CLEANING/PAINTING
1. General
A. The filter assembly can be one of two types: a disposable filter or a reusable filter assembly. The following cleaning procedure is for the reusable filter assembly only.
2. Equipment and Materials
A. Solvent - B01000 - General Cleaning of Metals (Series 80) (Ref AMM/SOPM 20-30-80)
B. Brush, Fiber-Bristle
C. Lubricant-Petrolatum (Ref 20-30-21)
3. Clean Filter
A. Remove filter assembly from bleed air duct (Ref Cooling Air Shutoff Valve Pneumatic Line Filter-Removal/Installation).
B. Disassemble filter assembly. Remove O-ring and filter element. Discard O-ring.
C. Place filter element in small container of solvent and soak for one hour.
D. Clean external and internal surfaces of filter head and housing using brush and solvent. Blow dry with low pressure compressed air.
E. Dry filter element with low pressure compressed air.
F. Lubricate and install new O-ring on filter head portion of filter assembly.
G. Insert filter element in filter head and install filter body.
NOTE: Check that O-ring remains seated when screwing filter body onto filter head.
H. Lockwire filter body and filter head together.
I. Install filter assembly in bleed air duct (Ref Cooling Air Shutoff Valve Pneumatic Line Filter -Removal/Installation).
May 01/98 49-51-22 Page 701 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PNEUMATIC ACTUATOR - REMOVAL/INSTALLATION
1. General
A. This section covers the removal and installation of the pneumatic actuator of the cooling air shutoff valve, located on the APU upper shroud assembly. Removal of the actuator is through an enlarged rectangular opening in the horizontal web (torque box) above the APU upper shroud. Access to the actuator is through access door 3701, just forward of the APU compartment.
2. Prepare to Remove Pneumatic Actuator
A. Position horizontal stabilizer trim in full up position (airplane nose down).
B. Open stabilizer trim control circuit breaker on P6 panel and placard that APU maintenance is "in-work".
C. Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is "in-work".
D. Open circuit breaker on M280 module - APU accessory unit on E3-3 electrical shelf.
E. Gain access to horizontal stabilizer jackscrew compartment.
3. Remove Pneumatic Actuator (Fig. 401)
A. Disconnect pneumatic pressure line from pneumatic actuator.
B. Remove cotter pin, washers, and pin attaching link to actuator assembly.
C. Remove bushing retainer, teflon bushing, nut and washer attaching actuator assembly to bracket on cooling air valve body and remove actuator.
NOTE: Teflon bushing may fit loosely in actuator. When removing retainer, use care not to drop bushing.
4. Install Pneumatic Actuator (Fig. 401)
A. Position pneumatic actuator on bracket of cooling air valve body and install washer, nut, teflon bushing, and bushing retainer. Tighten nuts and lockwire.
B. Attach link to actuator assembly with pin, washers, and cotter pin.
C. Check operation of actuator (Ref. 49-51-21, Adjustment/Test).
D. Connect pneumatic pressure line to pneumatic actuator.
5. Restore Airplane to Normal Configuration
A. Close access door to horizontal stabilizer jackscrew compartment.
B. Close circuit breaker on M280 module - APU accessory unit on E3-3 electrical shelf.
C. Close horizontal stabilizer trim control circuit breaker on P6 panel and remove placard.
D. Check that BATTERY SWITCH is ON and rotate horizontal stabilizer trim to neutral position.
E. Remove placard from APU START SWITCH.
F. Position BATTERY SWITCH to OFF if power no longer required.
533
Feb 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-51-32 Page 401
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