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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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  To do the trim balance survey, stop at the N1 speeds that follow 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 the 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.
 (c)  Do a slow decel (90-120 seconds) to IDLE.
 NOTE: Trim balance data is only taken during the accel
____
 vibration survey.

 (d)  
Operate the engine at IDLE for five minutes to let the engine become cool.

 (e)  
Use the Power Plant Operation (Normal) procedure to do the engine shutdown (AMM 71-00-00/201).

 (f)  
Remove the inlet cone (AMM 72-31-01/401).

 (g)  
Examine the hub flange for installed counter-weights (See Figure 503).

 (h)  
If weights are installed, do these steps: 1) Examine the fan blades and fan hub for an N1 Reference Mark.

 2)  If there is no N1 Reference Mark on a fan blade or the fan hub, do the steps that follow to make an N1 Reference Mark (See Figure 504). a) Remove the retaining ring of the key washer and the key
 washer.
 NOTE: The key washer holds the turbine shaft plug
____
 in position.

 b) Use a PWA 85306 Puller to remove the plug.
 c) Discard the packing.
 d) Find the small recess on the end of the coupling

 assembly of the turbine shaft.
 NOTE: This recess gives the location of the short
____ tooth which makes the signal for the N1 speed transducer.
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e) Make a mark with ink in a location which you can easily see on the fan blade which is aligned with the recess. f) Lubricate a new packing with the petrolatum. g) Install the packing to the turbine shaft plug. h) Install the turbine shaft plug to the coupling ID. i) Install the key washer and the retainer ring. j) Make sure that the retainer ring is fully installed all around the groove in the retainer nut.
 NOTE: The clearance between the ends of the retainer____
 ring will be 0.10 inch (0.254 mm) when it is correctly installed.
 3) 4)  Make a mark with a Silver Pencil on the fan blade rubstrip at the 12 o'clock position.To index the fan, rotate the fan until the mark on the fan blade is aligned with the mark on the fan rubstrip. a) Lubricate a new packing with the petrolatum. b) Install the packing to the turbine shaft plug. c) Install the turbine shaft plug to the coupling ID. d) Install the key washer and the retainer ring. e) Make sure that the retainer ring is fully installed all around the groove in the retainer nut.
 NOTE: The clearance between the ends of the retainer____
 ring will be 0.10 inch (0.254 mm) when it is correctly installed.
 f) Examine the hub flange for installed counterweights. g) Examine each counterweight for the letters "TB" marked on the inner diameter face.
　
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