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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
TASK 49-11-00-202-009
16. APU Inspection After Overtemperature During Start
_________________________________________________
A. General
(1) You must do this task if EGT is more than the red line (760°C) during the APU start and acceleration.
B. References
(1)
AMM 49-11-00/401, APU Power Plant
(2)
AMM 49-11-00/501, APU Power Plant
(3)
AMM 49-16-11/701, APU Shroud Drains
(4)
AMM 49-31-11/401, Fuel Control Unit
(5)
AMM 49-31-42/401, Combuster Unit
(6)
AMM 49-31-71/601, Fuel Drain
(7)
AIRPLANES WITHOUT THE ETC;
AMM 49-52-32/401, APU Control Thermostat
(8)
AIRPLANES WITH THE ETC;
AMM 49-52-31/401, Proportional Control Valve
C. Access
(1)
Location Zones
101 Control Cabin, LH
205 Electronic Compartment
703 APU Compartment
(2)
Access Panels
1201 Electronic Equipment Access Door
3804 APU Cowl Door
D. Procedure
S 862-173
(1) Set the switch and the circuit breaker:
(a)
Set the APU master switch on the P5 forward overhead panel to the OFF position and attach a DO-NOT-OPERATE tag.
(b)
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit
S 012-012
(2) Open the APU cowl door:
(a) Open the latches for the APU cowl door.
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(b)
Open the APU cowl door.
(c)
Connect the door support rods.
S 012-013
CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
(3) Remove the lower shroud:
(a)
Hold the lower shroud and open the shroud latches.
(b)
Remove the lower shroud.
S 032-014
(4)
Remove the combustor unit (AMM 49-31-42/401).
S 212-015
(5)
Visually examine the turbine wheel and the nozzle guide vanes for signs of damage:
(a)
Examine the turbine wheel tips for erosion or burns.
(b)
Examine the turbine wheel blades for erosion or worn areas.
(c)
Inspect the nozzle guide vanes and the torus assembly for erosion.
(d)
If the inspection shows damage, you must remove the APU power plant (AMM 49-11-00/401).
S 432-016
(6)
Install the combustor unit (AMM 49-31-42/401).
S 902-017
(7)
Replace the fuel control unit (AMM 49-31-11/401).
S 902-182
(8)
AIRPLANES WITHOUT THE ETC; Replace the control thermostat (AMM 49-52-32/401).
S 902-183
(9)
AIRPLANES WITH THE ETC; Replace the proportional control valve (AMM 49-52-31/401).
S 212-019
(10)
Make sure the fuel drains are not blocked (AMM 49-16-11/701 and 49-31-71/601).
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