(12)
 More procedures are necessary for very cold weather operations that are colder than -30°C (-22°F). Do the through-flight procedure or the cold soak procedure for overnight or extended periods.

 (13)
 A modified turbine exhaust cover is necessary when the engine is heated. It has two 250 mm (10 inch) diameter holes for the heater hoses.

 B.
Equipment

 (1)  
Heater, condition air cart

 (2)  
Service interphone equipment

 (3)  
LMC16M87 Engine inlet cover, or equivalent.

 Weckworth Langdon
 PO Box 3435
 Wichita, Kansas 67201-3435

 (4)  
LMC17M87 Turbine exhaust cover, or equivalent
 Weckworth Langdon

 (5)  
LMC17M87 Modified turbine exhaust cover (NOTE: This is a modified turbine exhaust cover with two 250 mm (10 in) holes for the heater hoses.) Weckworth Langdon

 (6)  
LMC18M87 Thrust reverser plug, or equivalent
 Weckworth Langdon

 C.
References

 (1)  
AMM 12-11-03/301, Fuel Sump Draining

 (2)  
AMM 12-33-01/301, Cold Weather Maintenance

 (3)  
AMM 24-22-00/201, Manual Control (Apply Power)

 (4)  
AMM 36-00-00/201, Pneumatic - General

 (5)  
AMM 72-00-00/201, Engine

 D.
Prepare the power plant.

 (1)
Prepare for normal engine operation and add the steps that follow:

 S 862-138-N00
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 ALL  ú ú N01A Page 275 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
WARNING: MAKE SURE THAT YOU FOLLOW THE PROCEDURES TO TURN THE LOW
_______ PRESSURE (N1) AND THE HIGH PRESSURE (N2) ROTOR SYSTEMS. FAILURE TO FOLLOW AMM 72-00-00/201 COULD RESULT IN INJURY TO PERSONS OR DAMAGE TO THE POWER PLANT.
 (a)  
Make sure the N1 rotor can turn freely in the counterclockwise direction as seen from the front (AMM 72-00-00/201). 1) Turn the fan blades with a wooden stick or a rod that is

 made of another material that will not damage the fan blades. 2) Make sure the N2 rotor can turn freely (AMM 72-00-00/201).

 (b)  
If the N1 or N2 rotors cannot turn, do these steps to heat the engine: 1) Remove all snow and ice from the engine inlet and the

 acoustic panels of the inlet cowl, the thrust reverser
 exhaust, and turbine exhaust areas. 2) Install the inlet cover. 3) Install the plugs for the thrust reverser. 4) Install the modified turbine exhaust cover. 5) Attach two heating hoses to the heater. 6) Install the two heater hoses through the modified turbine
 exhaust cover. 7) Operate the hot air source heater to supply hot air.
 NOTE: The temperature of the hot air must not be more than
____
 121°C (250°F).

 8) Apply hot air until the rotors turn freely.
 9) Stop the operation of the hot air source heater.
 10) Disconnect the heating hoses.
 11) Remove the modified turbine exhaust cover from the turbine

 exhaust.
 12) Install the turbine exhaust cover.

 CAUTION:_______THE ENGINE INLET MUST BE FULLY CLEAN OF ICE AND SNOW. THE ENGINE ANTI-ICE SYSTEM CAN MELT THE ICE AND SNOW AT THE HEATED AREA, BUT THE ICE CAN FREEZE AGAIN ON THE INLET ACOUSTIC PANELS AND ON THE ENGINE PARTS. THE ICE CAN CAUSE DAMAGE TO THE ENGINE.
 (c)  If the N1 or N2 rotors can turn, do these steps:
 1)  Remove all snow and ice from the engine inlet and the acoustic panels of the inlet cowl, the thrust reverser exhaust, and turbine exhaust areas.
 2) Install the inlet cover.
 3) Install the plugs for the thrust reverser.
 4) Install the turbine exhaust cover.

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 ALL  ú ú N01A Page 276 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(d)  
If you find it is difficult to open the fan cowl panels or the thrust reverser because of the snow or ice, apply hot air to the external surfaces as necessary. 1) Blow the melted snow or ice from the exterior joints of the
　
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