NOTE: The condensation temperature of the gas is approximately
____
100°F (38°C).
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A
747-400 MAINTENANCE MANUAL
(j)
Continue to flush the inlet screen and spring assembly (11) in the opposite direction and ultrasonic clean the inlet screen and spring assembly for 1-3 minutes.
(k)
Drain the inlet screen and spring assembly (11) above the water jacket level for 1-5 minutes.
(l)
Make sure the cooling system is on for a minimum of 30 minutes after the ultrasonic cleaner is off.
WARNING: DO NOT USE COMPRESSED AIR WITH A PRESSURE OF MORE THAN 30
_______ PSIG (207 kPa GAGE) TO CLEAN THE PARTS. USE SOME GOGGLES OR A FACE SHIELD FOR EYE PROTECTION. DO NOT POINT THE AIR AT YOUR SKIN. INJURY TO PERSONS CAN OCCUR.
(m) Dry the inlet screen and spring assembly (11) with the clean compressed air at 30 psig (207 kPa gage) for 1-3 minutes.
S 422-111
(4) Do this task: Fuel Pump Inlet Screen Installation (Par. 3).
TASK 49-31-00-002-024
5. Fuel Pump Outlet Filter Element Removal (Fig. 201)_______________________________________
A. Equipment
(1)
Container - Fuel Resistant, 1 U.S. Gallon (4 Liters)
B.
Access
(1)
Location Zones
221 Control Cabin - Left
222 Control Cabin - Right
310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
C.
Prepare for the Removal
S 862-090
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 862-091
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6-2 Main Power Distribution Panel
1) 6K18, APU ALTN CONT
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747-400 MAINTENANCE MANUAL
(b) P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT
S 012-092
(3)
Open the left APU access door, 317AL, and right APU access door, 318AR:
(a)
While you hold the two APU access doors in the closed position, open the six latches on the right access door.
NOTE: The left access door will open fully and the right
____ access door will drop approximately one inch (2.5 cm) from the fuselage frame when the last latch is opened.
NOTE: A lanyard is attached to the aft end of the right access
____ door to hold the access door to the APU compartment bulkhead.
CAUTION: BE CAREFUL NOT TO MOVE THE TWO APU ACCESS DOORS TO THE
_______ OUTBOARD SIDE FROM THE FULL OPEN POSITION. THE FULL OPEN POSITION IS WHERE THE APU ACCESS DOOR IS DOWN AND THE TWO HOLD-OPEN RODS ARE CONNECTED TO THE TWO BRACKETS ON THE APU COMPARTMENT BULKHEAD. DAMAGE TO THE ELEVATOR CONTROL SURFACES CAN OCCUR.
(b)
Open the left access door to the fully open position and remove the two hold-open rods from the two clips.
(c)
Remove the two quick-release pins from the two brackets on the left APU compartment bulkhead.
(d)
Connect the two hold-open rods from the left access door to the two brackets and install the two quick-release pins.
(e)
Push the right access door up and remove the lanyard from the pin on the aft APU compartment bulkhead.
(f)
Open the right access door to the fully open position and remove the two hold-open rods from the two clips.
(g)
Remove the two quick-release pins from the two brackets on the right APU compartment bulkhead.
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