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Trim Balance - One Shot Method Figure 509/TASK 77-32-34-991-950- 12 (SHEET 1)
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Trim Balance - One Shot Method Figure 509/TASK 77-32-34-991-950- 22 (SHEET 2)
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TASK 77-32-34-750-001- 01
Fan Trim Balance with the EVMU (Vectorial Method)
1. Reason for the Job
__________________
You can use this procedure when consecutive fan trim balances with the EVMU when you use the one shot method did not give significant results. In all other cases the one shot method is recommended.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific warning notice
No specific Torque Wrench : range 36.00 to 220.00 lbf.in
(0.40 to 2.60 m.daN)
B. Consumable Materials
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REFERENCE DESIGNATION
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Material No. CP2101 *
graphite grease (Ref. 70-30-00)
C. Referenced Information
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REFERENCE DESIGNATION
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24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 31-32-00-860-012 Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page 77-32-34-860-042 Acquire Unbalance Data During the Flight and Read
Unbalance Data
77-32-34-860-043 Unbalance Acquisition on the Ground
77-32-34-991-951 Fig. 510
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3. Job Set-up
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Subtask 77-32-34-861-070
A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 77-32-34-865-079
B. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU ENGINE/ENG1 AND 2/EVMU 1EV R44
Subtask 77-32-34-941-053
C. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 77-32-34-860-066
D. Aircraft System Configuration
(1) On the spinner rear cone, record the identification (P0X) and the position of all the 36 balance screws.
NOTE : The balance screws are identified by a number (P0X) engraved
____
on the screw head.
NOTE : A spherical mark is machined on the spinner rear cone to show
____ the fan blade No.1 location. The fan blade No.1 is to the left
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of the mark, forward looking aft (the blades are counted counterclockwise).
Subtask 77-32-34-869-099
E. Aircraft Maintenance Configuration
(1) To do this procedure flight or ground vibration data must be available (Ref. TASK 77-32-34-860-042) or (Ref. TASK 77-32-34-860-043).
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