72-31-00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(7)
PWA 85234 Riveter - (Flaring Pliers, for Fan Weight Rivets)
Pratt & Whitney
(8)
ENGINES POST-PW-SB 72-385;
0.190-32 Jackscrews - 8 are necessary
(9)
ENGINES PRE-PW-SB 72-385;
PWA 83507 Puller - Pratt & Whitney
C.
Consumable Materials
(1)
G00846 Pencil - Silver
(2)
D00504 Petrolatum - White
(3)
D00390 Oil - Engine
(4)
G00949 Ink
D.
References
(1)
AMM 71-00-00/201, Power Plant
(2)
AMM 71-00-00/501, Power Plant
(3)
AMM 72-31-01/401, Inlet Cone
(4)
AMM 78-11-02/401, Turbine Exhaust Plug
E.
Access
(1)
Location Zone
412 Engine No. 1
422 Engine No. 2
432 Engine No. 3
442 Engine No. 4
F.
Prepare for the Trim Balance Procedure.
S 485-097-N00
(1)
Do the steps that follow to install the trim balance equipment (See Figure 507).
(a)
Find the AVM Signal Conditioner.
(b)
Connect the MTI 8900-5065 Interface Cable to AVM front panel maintenance connector.
(c)
Route the MTI 8900-5065 Interface Cable to PBS-4100 location in the aircraft.
(d)
Connect the MTI 8900-5065 Interface Cable to Switch Box (8115-6714) and to the PBS-4100 Data Acquisition Unit.
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(e) Connect PBS-4100 Data Acquisition Unit to the PBS-4100 Computer.
NOTE: Refer to the PBS-4100 equipment manual for
____ installation instructions of the PBS-4100.
(f) With the extension cord and adapter, connect the DAU, and the laptop computer to 115V 400HZ power in the cockpit.
S 975-098-N00
(2)
Make a record of the date, airplane, and engine that will be balanced (Fig. 502 and 503):
G.
As-Is Trim Balance Survey.
S 975-099-N00
(1)
Do the steps that follow to do the As-Is Trim Balance Survey:
(a)
Thermally stabilize the engine as follows:
NOTE: You must have a thermally stable engine before you
____
do the vibration survey.
WARNING:_______USE AMM 71-00-00/201 TO OPERATE THE POWER PLANT. IF YOU DO NOT USE THIS PROCEDURE, YOU CAN CAUSE DAMAGE TO EQUIPMENT OR INJURIES TO PERSONS.
1) Use the Power Plant Operation (Normal) procedure to start
the engine (AMM 71-00-00/201). 2) Operate the engine at minimum power for five minutes. 3) Do a slow acceleration to 1.3 EPR power, then stay at 1.3
EPR for three minutes. 4) Decrease the power to IDLE, then stay at IDLE for six minutes.
NOTE: You now have a thermally stable engine.
____
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b) To do the trim balance survey, stop at these N1 speeds and take trim balance data during the slow accel (90-120 seconds) to 90% N1 (3250 RPM).
63% N1 (2250 RPM) speed 68% N1 (2450 RPM) speed 82% N1 (2950 RPM) speed 90% N1 (3250 RPM) speed
NOTE:____ Refer to PBS-4100 operation manual for instructions on computer operations.
NOTE:____ PBS-4100 software V2.21 and higher will let you take the trim balance data during the vibration survey. If the software is pre V2.21, the vibration survey and the trim balance can be done separately.
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