Fan Trim Balance - 1 Sensor 1 Speed
1. Reason for the Job
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This procedure must only be used only after a fan blade replacement and when:
- the A/C is not at its main base
- the crew is not familiar with the imbalance correction process and that a
computer is not available.
Though it is not as efficient as the "Cold Trim Balance" procedures (Ref.
TASK 71-00-00-750-001), this procedure will clear the A/C for take-off if
the vibration survey shows that the vibration level is not higher than 6.0
units prior to the flight.
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
31-32-00-860-012 Procedure to Get Access to the SYSTEM REPORT/TEST/ENG
Page 71-00-00-710-003 Engine Automatic Start 77-32-34-860-042 Acquire Unbalance Data During the Flight and Read
Unbalance Data 71-00-00-991-361 Fig. 532
3. Job Set-up
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Subtask 71-00-00-869-208
A. Safety Precautions
(1) Make sure that the aircraft is parked on a clean dry flat area. There must be no oil, grease or other slippery material on that surface. Pavement must be in concrete because asphalt can cause damage to the engine.
(2) Make sure that a total of 3000 Kg (minimum) of fuel are in the inner tanks.
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B. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
49VU L/G/LGCIU/SYS1/NORM 1GA C09 121VU HYDRAULIC/LGCIU/SYS2 2GA Q35 121VU HYDRAULIC/LGCIU/SYS1/GRND SPLY 52GA Q34
4. Procedure
_________ Subtask 71-00-00-710-089
A. Start the two engines and let them become stable at minimum idle for 5 minutes (Ref. TASK 71-00-00-710-003).
Subtask 71-00-00-869-111
B. Aircraft Maintenance Configuration
(1) On the MCDU 1(2), get the SYSTEM REPORT/TEST ENG page (Ref. TASK 31-32-00-860-012).
(2) Push the key adjacent to the EVMU indication: the first EVMU page comes into view.
(3) Push the NEXT PAGE key.
(4) Push the key adjacent to the ENGINE UNBALANCE indication.
(5) The EVMU ENGINE UNBALANCE menu comes into view. Subtask 71-00-00-750-056
C. Do this procedure: WARNING : DO NOT LET ONE ENGINE OPERATE AT N1 GREATER THAN OR EQUAL TO 75
_______ PERCENT WHEN ONLY THE WHEEL CHOCKS AND THE PARKING BRAKE STOP THE MOVEMENT OF THE AIRCRAFT.
(1) Before N1 is more than or equal to 75 percent, do this procedure: CAUTION : DO NOT OPEN LGCIU CIRCUIT BREAKERS 1GA, 2GA, AND 52GA. IF
_______ YOU DO THIS, AIRCRAFT BRAKING THROUGH BRAKE PEDALS DOES NOT OPERATE.
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(a) On the landing gear control and indicating panel 402VU: 1 Make sure that the A/SKID & N/WSTRG selector switch 5GG is ON.
_
(b) Push and hold the brake pedals at the full limit position.
(c) On the RUD TRIM/PARKING BRK panel 110VU:
- Set the PARKING BRAKE control switch to OFF.
(2) Slowly increase power of the non tested engine to 60 percent N1.
(3) Slowly increase power to 80 percent N1 while monitoring the vibration parameters of the No. 1 bearing and TRF sensors.
(4) Warm up the engine at 80 percentr N1 for 5 minutes.
(5) Increase engine rate to T/O N1 if the vibration amplitudes are less than 6 mils.
NOTE : If the vibration amplitude is above 6 mils, do a fan trim
____ balance on speed below 6 mils as a pre trim balance and then trim balance again until the vibration amplitude is below 6 mils.
(6) Record the amplitude (A) and angle (D) of the No. 1 bearing vibration at the maximum N1 reached. (Ref. Fig. 532/TASK 71-00-00-991-361)
(7) Reduce power to minimum idle, let the engine power become stable for 5 minutes then stop the engines.
(8) Put the aircraft in the "parking-brake applied" configuration: 中國航空網(wǎng) www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機(jī)維護(hù)手冊 AMM 動力裝置 POWER PLANT 1(70)
