Differential Air Pressure Regulator Installation 500
49-52-21 Figure 401 Aug 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
DIFFERENTIAL AIR PRESSURE REGULATOR - ADJUSTMENT/TEST
1. General
A. An operational check of the differential air pressure regulator should be made if any one of the following occurs: (1) the regulator was disassembled for cleaning; (2) the regulator was removed and replaced; or (3), the bleed air valve was removed and replaced.
2. Equipment and Materials
A. Pressure gage - 60 or 100 psi
B. Suitable length of flexible air hose and fittings
3. Test Differential Air Pressure Regulator
A. Remove cap from tee fitting at bleed air valve (Fig. 401).
B. Attach flexible air line with pressure gage to tee fitting.
C. Operate APU (Ref 49-11-0, Engine Start Procedure).
NOTE: Allow engine to accelerate to no-load steady state rpm.
D. Observe pressure indicated on air pressure gage. Pressure should be 18.5 to 19.5 psi.
E. If pressure is not within specified limits, shut down engine and adjust air pressure regulator as follows:
(1)
Loosen locknut and adjust.
(a)
Turn adjusting screw clockwise to increase outlet pressure.
(b)
Turn adjusting screw counterclockwise to decrease outlet pressure.
(2)
Tighten locknut and repeat steps C thru E.
F. If pressure is within specified limits, shut down engine.
G. Remove flexible air line with pressure gage from tee fitting and reinstall cap.
500
Aug 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-52-21 Page 501
Differential Air Pressure Regulator Installation 500
49-52-21 Figure 401 Aug 15/73
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
APU CONTROL THERMOSTAT-REMOVAL/INSTALLATION
1. Equipment and Materials
A. Antiseize Compound - Fel-Pro C-5A (Ref 20-30-21)
2. Prepare for Thermostat 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.
D. Support lower shroud, open shroud latches and remove shroud.
CAUTION: EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
3. Remove Thermostat (Fig. 401)
A. Disconnect control air line from thermostat.
B. Remove attaching bolt and washer.
C. Carefully withdraw thermostat from mounting flange.
4. Install Thermostat (Fig. 401)
A. Install control thermostat in exhaust mounting flange.
B. Coat threads of retaining bolt with antiseize compound; install bolt with washer. Tighten bolt to torque value of 50 to 70 pound-inches.
CAUTION: DO NOT USE WRENCH ON THERMOSTAT ADJUSTMENT COLLAR OR BODY WHEN CONNECTING CONTROL AIR LINE AS THERMOSTAT SETTING WILL CHANGE AND POSSIBLY CREATE AN OVERTEMPERATURE CONDITION.
C. Connect control line to thermostat.
D. Test control thermostat (Ref Adjustment/Test).
5. Restore Airplane to Normal Configuration
A. Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B. Disengage APU compartment access door support rods and stow rods. Close and latch access door.
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