(a)  
You must operate the engine at idle for a minimum of five minutes after the initial start and before the engine shutdown.

 (b)  
If the engine is operated at high power (more than 1.4 EPR) for more than 30 seconds, with the acceleration time included, and then put back to idle, you must operate the engine at idle for less than one minute or more than 10 minutes before a snap acceleration to high power is done again. You do not have to operate the engine at idle if the acceleration is done slowly (a minimum of 60 seconds).

 D.
Engine Cool Down

 S 862-018-N00
 WARNING: DO NOT TOUCH THE BUFFER AIR COOLER FOR THE NO. 3 BEARING OR THE
_______ RELATED TUBES FOR THREE HOURS AFTER THE ENGINE SHUTDOWN. INJURIES CAN OCCUR BECAUSE THE BUFFER AIR COOLER CAN GET TO A TEMPERATURE OF 950°F (510°C) DURING THE ENGINE OPERATION.
 (1)  
After an engine operation, make sure that the turbine exhaust sleeve and plug are not hot before you do the work in these areas. Without the buffer air cooler included, you can do the work on most other parts without the risk of injury.

 E.
Compressor Bleed Valves

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 862-019-N00
 WARNING: WHEN A BLEED VALVE OPENS, HIGH PRESSURE AIR AT HIGH VELOCITY IS
_______
 RELEASED OUT OF THE ENGINE. THE FORCE OF THIS HIGH PRESSURE
 AIR, SPECIALLY WHEN THE BLEED VALVE FIRST OPENS DURING
 DECELERATION FROM HIGH RPM, IS SUFFICIENT TO CAUSE INJURY TO
 PERSONS.

 (1)  
When you operate the engine, make sure persons stay away from the
 surge bleed ducts during the open operation of the bleed valve. If
 the side cowl panels are not installed, make sure the persons stay
 away from the compressor bleed valves.

 F.
Engine Noise (Fig. 202)

 S 862-063-N00
 (1)  
All persons must obey the noise hazard areas of the engine. The noise of the jet engine can cause temporary or permanent damage to your ears. All persons must use protection for their ears. If you are in a very high noise area for a short time, you can cause damage to your ears. The noise can cause damage to the ear mechanism which will cause you to not be stable or move correctly. Thus, you are recommended to use the cup-type ear protection. If used, aerostands or platforms must have protection railings for persons to hold on.

 G.
Engine Ignition

 S 862-062-N00
 WARNING:_______OBEY THESE INSTRUCTIONS WHEN YOU DO WORK ON THE ENGINE. THE
 ENGINE IGNITION SYSTEM IS USUALLY HIGH IN ENERGY. THIS IS A
 DANGEROUS SOURCE OF ELECTRICAL SHOCK UNLESS YOU USE
 PRECAUTIONS. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN
 CAUSE INJURY TO PERSONS, OR POSSIBLY KILL.

 (1)  
Do not disconnect the ignition system components unless you first
 remove the input leads from the ignition exciter.

 H.
Buffer Air Cooler for the No. 3 Bearing (Fig. 203)

 S 862-061-N00
 WARNING: DO NOT TOUCH THE BUFFER AIR COOLER FOR THE NO. 3 BEARING OR THE
_______
 RELATED TUBES FOR THREE HOURS AFTER THE ENGINE SHUTDOWN.
 INJURIES CAN OCCUR BECAUSE THE BUFFER AIR COOLER CAN GET TO A
 TEMPERATURE OF 950°F (510°C) DURING THE ENGINE OPERATION.

 (1)  
The buffer air cooler can get to a temperature of 950°F (510°C)
 during a high power operation. It is necessary to let the engine
 become cool if this occurs.

 I.
Deicing Fluid

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_______WITH EAR PROTECTION,
　
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