(e)  
You can motor the engine at speeds as low as 10% N2 rpm for a maximum of two minutes.

 B. Engine Operation Limits
 S 862-095-N00
 (1)  
The related wind data that is recommended for the engine maintenance operation is shown in Fig. 203A.

 S 862-031-N00

 (2)  
More data about the effect of the tailwinds on the engine ground operations are in the steps that follow.

 S 862-071-N00

 (3)  
Tailwinds, or components of the tailwinds, have a bad effect on the ground operation of the engines.

 (a)  During a start, and at idle speed or a low level of power, you can get a high EGT.
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THE WIND VELOCITY IS FOR STABLE WINDRELATIVE WIND
CONDITIONS. DECREASE THE MAXIMUM
WIND LIMIT 5 KNOTS FOR GUSTY WIND RECOMMENDED (25 KNOTS MAXIMUM CONDITIONS, OR UNTIL THE SVA INDICATION WIND VELOCITY ON THE EICAS EPCS PAGE BECOMES STABLE.
FOR POWER LEVELS UP TO 1.25 EPR. FOR POWER STOP THE TRIM RUN OF THE ENGINE IF THELEVELS ABOVE 1.25 EPR. A MINIMUM WIND SPEED SVA INDICATION ON THE EICAS EPCS PAGE
IS NOTSTABLE. ALSO STOP THE TRIM RUN10 KNOTS IS PERMITTED. OPERATION SHOULD BE IF THE INLET SOUND CHANGES TO AWITH EXTRA HIGH ALERT FOR DESTABILIZING BLOWTORCH-TYPE SOUND. DECREASETHEINDICATIONS AS DESCRIBED IN NOTE 1. A LOCAL

POWER TO IDLE AND EXAMINE THE RELATIVEWIND STATIONIS RECOMMEDED IF AVAILABLE.
WIND DIRECTION AND SPEED. STOP THE PERMITTED (15 KNOTS MAXIMUM ENGINE AND CHANGE THE POSITION OF THE WIND VELOCITY) AIRPLANE TOPOINT IN THE DIRECTION OF

THE WIND, IF IT IS NECESSARY, BEFOREFOR POWER LEVELS UP TO 1.25 EPR.
YOU COMPLETE THE ENGINE TRIM RUN. LIMITED UP TO THE FLIGHT IDLE
YOU CAN OPERATE THE APU DURING THE(5 KNOTS MAXIMUM WIND VELOCITY) ENGINE OPERATION ON THE GROUND.
Preferred Relative Wind Direction During an Engine Operation
Figure 203A

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A85164
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
At a high level of power, a compressor stall can occur.

 (c)  
You must quickly (in less than 1-2 seconds) move the thrust lever rearward, from a high power to idle, to prevent a compressor stall. 1) The EGT and the fuel flow must decrease.

 (d)  
When a compressor stall occurs, you must quickly move the thrust lever rearward to prevent the compressor stall.

 (e)  
When the airplane is in a strong tailwind which causes the engine to turn in the opposite direction, it is recommended that you monitor the start to prevent a possible hot start.

 (f)  
If problems with the start occur because of the tailwind, put the airplane at a location into the wind.

 C. Overspeed Limits
 NOTE: When the engine speed is more than the overspeed limits, you must
____ quickly do the Engine Shutdown (Normal) Procedure when it is possible unless the operation will cause more engine damage. Do not start the engine again until the applicable overspeed inspection is done.
 S 862-033-N00
 (1)  If the N1 speed is more than 111.4 percent (4012 rpm) or if the N2 speed is more than 105.5 percent (10,450 rpm), do the steps that follow:
 (a)  
Make a record from the EICAS maintenance page of the maximum N1 or N2 speed during the engine operation and the quantity of time the speed was more than the N1 or N2 limit.

 (b)  
Push the CNCL button on the EICAS select panel to remove the overspeed indication when the overspeed fault is corrected. Make sure the box around the digital display of the rotor speed changes from red to white.

 NOTE: Before you remove an engine because of an overspeed
____ indication, make sure the tachometer indicating system operates correctly (AMM 77-12-00/501).
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