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ALL ú ú 16 Page 533 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
2) Loosen the locknut for the valve adjustment screw. 3) If the cracking pressure is too low, turn the valve adjustment screw clockwise.
NOTE: A full turn of the adjustment screw is the same as
____ approximately a 8-10 psig change.
4) If the cracking pressure is too high, turn the valve
adjustment screw counterclockwise. 5) Tighten the locknut for the valve adjustment screw. 6) Install a lockwire on the locknut for the valve adjustment
screw.
(k)
AIRPLANES WITH THE TAFCU; If the cracking pressure is more than 65 psig (448 kPa) or less than 55 psig (380 kPa), replace the timed acceleration fuel control unit (AMM 49-31-11/401).
(l)
Set the APU master switch on the P5 forward overhead panel to the OFF position and attach a DO-NOT-OPERATE tag.
CAUTION: MAKE SURE YOU OBEY THE DUTY CYCLE FOR THE STARTER MOTOR
_______ (AMM 49-11-00/201). DAMAGE TO THE STARTER MOTOR CAN OCCUR.
(m)
Set the No. 1 AFT FUEL PUMP switch on the P5 forward overhead panel to the OFF position.
(n)
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit
(o)
Remove the external electrical power from the airplane (AMM 24-22-00/201).
S 085-096
(7) Remove the test pressure gage:
(a)
Disconnect the pressure gage from the high-pressure fuel line.
(b)
Connect the high-pressure fuel line to the fuel atomizer.
(c)
Install the cap on the control-air pressure port on the fuel control unit.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 415-097
CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, FIRE DETECTOR, CLAMPS AND LOWER SHROUD.
BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
(8) Install the lower shroud:
(a)
Hold the lower shroud against the upper shroud.
(b)
Close the shroud latches.
S 415-098
(9) Close the APU cowl door:
(a)
Disconnect the door support rods.
(b)
Put the door support rods in the clips on the APU cowl door.
(c)
Close the APU cowl door.
(d)
Close the latches for the APU cowl door.
S 865-099
(10) Set the circuit breakers and the switch:
(a)
Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit
(b)
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
TASK 49-11-00-705-100
7. Bleed Air Valve Opening Rate Test
_________________________________
A. General
(1) It is not necessary to do the opening rate test for the bleed air valve after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting or adjustment of the bleed air valve.
B. Special Tools and Equipment
(1) 290270-2-1 Tester - Gas Turbine Engine, AlliedSignal, Inc., Airline Services Division, P.O. Box 52170, Phoenix, AZ 85072-2170
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49-11-00
ALL ú ú 08 Page 535 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
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