cowl panels before the panels are opened.

 (e)  
Drain the water from all fuel sumps in the fuel system (AMM 12-11-03/301).

 NOTE: If the fuel flows freely from the drains in the tank
____
 sumps, the fuel system has no ice.

 1)  If there is ice in the fuel system, blow hot air from an explosion-proof hot air source (121°C or 250°F maximum) at the drain area (AMM 12-33-01/301).
 S 862-139-N00
 (2)  Do these steps for a through-flight at temperatures colder than -30°C.
 NOTE: Through-flight conditions are defined as follows:
____
 -
The cabin temperatures are kept warmer than 0°C (32°F) and,

 -
The engine oil temperatures are warmer than -40°C (-40°F), while the airplane is on the ground and,

 -
The airplane is monitored during this time.

 (a)  
If the EICAS engine oil temperature or cabin temperature indications have decreased below these values, do the steps to return the airplane to service after a cold soak (follow the through-flight steps).

 (b)  
Make sure that you follow the procedure for airplane cold weather maintenance (AMM 12-33-01/301).

 NOTE: To look at the oil temperature on EICAS with the engines
____ stopped, turn on the EEC Ground Test Power.
 (c)  Remove the inlet cover, thrust reverser plugs, and turbine exhaust cover from the engines.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION: THE EICAS ENGINE OIL TEMPERATURE VALUE MUST BE WARMER
_______ THAN -40°C (-40°F) AT THE ENGINE START FOR THROUGH-FLIGHTS. IF THE ENGINE OIL TEMPERATURE IS COLDER THAN -40°C (-40°F) AND YOU START THE ENGINE, DAMAGE TO THE ENGINE BEARINGS CAN OCCUR.
 (d)  Start the engine with the cold weather procedure (follow the steps for the cold soak).
 NOTE: During engine starts at cold temperatures, high oil
____ pressure can occur, and the indicated oil quantity can decrease. As the oil temperature increases with the engine operation at idle thrust, the oil pressure will decrease and the indicated oil quantity will go to the usual condition.
 (e) Operate the engine at idle until the oil temperature is equal to or warmer than 0°C (32°F) before you move the thrust levers forward and accelerate the engine from idle power. 1) Operate cold engines at idle power or taxi power until the oil temperature is more than 50°C (122°F) before you go to takeoff power.
 2)  If you use this procedure to re-warm the engine, make sure the engine operates at idle power for a minimum of ten minutes before the engine is shutdown.
 NOTE: Measure the ten minutes from the time that the
____ engine oil temperature is 0°C (32°F). These ten minutes are the minimum time for the engine temperature to become stable. You can increase the time periods between engine operations to re-warm the engine if you increase the engine run time to more than ten minutes or use a higher power level than idle power.
 (f)  
Stop the engine.

 (g)  
Install the inlet cover.

 (h)  
Install the thrust reverser plugs.

 (i)  
Install the turbine exhaust cover when the engine exhaust is sufficiently cool to prevent damage to the cover.

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S 862-112-N00
 (3)  Do these steps to return the airplane to service after a cold soak.
 NOTE: A cold soak is defined as follows:
____
 -
The outside temperature is less than -15°C (5°F).

 -
The airplane has remained overnight, or for an extended period, and is not monitored during this time.

 (a)  
Make sure that you follow the procedure for airplane cold
 weather maintenance (AMM 12-33-01/301).
　
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