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(3) AMM 49-91-41/601, Oil Cooler Inspection/Check
D. Access
(1)
Location Zones
101 Control Cabin (Left)
205 Electronic Compartment
701 Tail Compartment
703 APU Compartment
(2)
Access Panels
1201 Electronic Equipment Access Door
3701 Stabilizer Trim Access Door
3804 APU Cowl Door
E. Procedure
S 862-007
(1) Make sure the switch and the circuit breaker are set correctly:
(a)
Make sure the APU master switch, on the P5 forward overhead panel, is in the OFF position with a DO-NOT-OPERATE tag attached.
(b)
Make sure this circuit breaker is open with a DO-NOT-CLOSE tag attached: 1) E3-3 Electrical Shelf, APU Control Unit
S 862-028
(2) Make sure the electrical connectors are disconnected:
(a)
Make sure the electrical connector is disconnected from the stabilizer trim electric actuator.
(b)
Make sure the electrical connector is disconnected from the autopilot stabilizer trim servo.
S 142-008
(3) Clean the fan inlet screen:
(a)
Clean the fan inlet screen with the vacuum cleaner. 1) Put the nozzle of the vacuum cleaner in the inspection tube to remove all blockage.
2) If there are pieces too large or heavy for the vacuum cleaner, use a claw type retriever to remove them.
(b)
With a flashlight, examine the fan inlet screen for remaining blockage. 1) If you found blockage, do these steps to clean the fan
inlet screen with solvent:
a) Remove the fire loop bracket from the crossover duct.
b) Remove the two clamps from the crossover duct.
c) Remove the crossover duct and the two gaskets.
d) Put a cover on the cooling air inlet to the generator
and the cooling air inlet to the oil cooler. e) Put a container under the cooling fan housing. f) Place the solvent into the pressure washer.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
g) Place the nozzle of the washer into the inspection
tube. h) Wash the screen with the solvent. i) Use the container to catch the solvent and dissolved
blockage. j) Rinse the inspection tube, the cooling fan, and the APU with clean water. k) Remove the cover from the cooling air inlet to the oil
cooler. l) Do the inspection of the oil cooler (AMM 49-91-41/601). m) Remove the cover from the cooling air inlet to the
generator. n) Put the two gaskets in the crossover duct. o) Put the crossover duct on the cooling fan and the oil
cooler. p) Install the two clamps on the crossover duct. q) Install the fire loop bracket on the crossover duct.
2) With a flashlight, examine the fan inlet screen for blockage. a) If you found blockage, remove the APU and clean or
replace the fan inlet screen (AMM 49-11-00/401).
S 432-009
(4)
Install the cap assembly on the inspection tube.
S 432-269
(5)
Install the pin or bolt in the cap assembly.
S 022-025
(6)
Remove the caps from the electrical connectors and receptacles.
S 422-026
(7)
Connect the electrical connector to the autopilot stabilizer trim servo.
S 422-027
(8)
Connect the electrical connector to the stabilizer trim electric actuator.
(9)
Close the access door 3701 for the stabilizer trim.
S 412-010
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