(c)
Put the AUTOSTART switch to the OFF position.
CAUTION: MAKE SURE YOU DO NOT ENGAGE THE STARTER AT A SPEED OF MORE
_______
THAN 15% N2. DAMAGE TO THE STARTER CAN OCCUR.
(d)
Let the engine decrease in speed to less than 15 %N2, then pull out the applicable START switch.
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 AND INJURY TO PERSONS.
(e)
Use the Power Plant Dry-Motor procedure to motor the engine
until the EGT is less than 180°C (AMM 71-00-00/201).
(f)
Do the necessary corrections for an engine stall [Ref 71-FAULT CODE DIAGRAM, Surge (Stall) - Fault Codes].
CAUTION: MAKE SURE YOU DO THE START PROCEDURE AFTER AN EMERGENCY
_______ ENGINE SHUTDOWN. IF YOU DO NOT DO THIS PROCEDURE, DAMAGE TO THE TURBINE BLADE TIP SEALS CAN OCCUR.
(g) Do this procedure: Start Procedure After An Emergency Engine Shutdown (AMM 71-00-00/201).
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(5) Operate the engine at stable idle for 5 minutes.
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WARNING: MAKE SURE THE BRAKES OPERATE CORRECTLY AND NO PERSONS ARE IN
_______ THE AREA OF THE HIGH SPEED EXHAUST. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONS CAN OCCUR.
(6) Slowly increase the speed of the engine to 1.3 EPR for 3 minutes to let the temperature of the engine become stable.
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TEST NO. 8 - VIBRATION SURVEY
_____________________________
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(7)
Move the thrust lever rearward to decrease the speed of the engine to the idle N2 rpm position.
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(8)
Let the engine become stable for 6 minutes.
NOTE: You can do the Vibration Survey only if the temperature
____
of the engine is stable.
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(9)
Monitor the N1 and N2 VIB data on the auxiliary EICAS.
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(10)
Slowly move the thrust lever forward at a constant rate from stable idle to 1.4 EPR.
NOTE: A constant rate changes the speed from stable idle to 1.4 EPR
____ in 90-120 seconds. You must have a sufficiently slow rate of change to make sure you can see the high vibration indications.
(a) During the acceleration, monitor the N1 and the N2 VIB indications on the auxiliary EICAS display for high vibrations.
NOTE: The engine can have one or more high vibrations when the
____ engine speed increases from idle to 1.4 EPR.
(b) Make a record of the %N1 and %N2 rpm indications at which the high vibrations occur during the acceleration.
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(11) Slowly move the thrust lever rearward at the same constant rate to decrease the speed from 1.4 EPR to the idle position.
NOTE: A constant rate changes the speed from 1.4 EPR to idle in
____
90-120 seconds. You must have a sufficiently slow rate of
change to make sure you can see the high vibration
indications.
(a) During the deceleration, monitor the N1 and the N2 VIB indications on the auxiliary EICAS display for high vibrations.
NOTE: The engine can have one or more high vibrations when the
____ engine speed decreases from 1.4 EPR to idle.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TEST NO. 8 - VIBRATION SURVEY
_____________________________
(b) Make a record of the %N1 and %N2 rpm indications at which the high vibrations occur during the deceleration.
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(12) Do a check of the vibration at each of the engine speeds written in the steps before.
(a)
Slowly increase the speed of the engine to the RPM indications, which each high vibration occurred, and let the engine become stable for 30 seconds.
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本文链接地址：747-400 AMM 飞机维护手册 动力装置 POWER PLANT 1(65)
