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 (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) (f) (g) (h)  Use the Power Plant Operation (Normal) procedure to do the engine shutdown (AMM 71-00-00/201).Remove the inlet cone (AMM 72-31-01/401).Examine the hub flanged for installed counter-weights (See Figure 503).If weights are installed, do these steps: 1) Examine the fan blades and the 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.

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3)
4)

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.
 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.

Make a mark with Silver Pencil on the fan blade rubstrip at
 the 12 o'clock position.
To index the fan, turn 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.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
f) Examine each counter-weight for the letters "TB" marked on the inner diameter face. g) Make a record of the part number and tang location of all counter-weights.
 NOTE: After the fan is indexed, the tang at the
____ 12 o'clock position is the No. 1 tang. The tangs are numbered 1 through 19 in the clockwise direction.
 5)  Input their weight (PBS class number) and location (tang number) into the PBS-4100 computer.
 NOTE: The PBS class number must be input as a negative
____ (-) number.
 6) Remove all of the counterweights on the fan.
 7) Install the inlet cone (AMM 72-31-01/401).
 8) Do a Check Run with the steps given later in this task.

 (i) If counterweights are not installed, do these steps:
 1)  Install counterweights No. 1 (CW1) trial weights to the fan balance ring (See Table 504).
 NOTE: Use assembled phase angle and sensitivity data to
____ find CW1 trial weight location.
 2)  Temporarily install the correction weights in the fan with
 the cotter pins.
 3)  Install the inlet cone (AMM 72-31-01/401).
 4)  Do a Check Run with the steps given later in this task.
　
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