(a) On the load control panel P6:
1) ENG NO.2 LEFT IGNITION
2) ENG NO.2 RIGHT IGNITION
S 862-128-C00
(4) Remove the DO-NOT-CLOSE tags and close these circuit breakers.
(a) On the panel, P6-3:
1) FUEL SYSTEMS SHUTOFF VALVE ENG 1
2) FUEL SYSTEMS SHUTOFF VALVE ENG 2
S 862-129-C00
(5) Remove the pneumatic power, if it is not necessary (AMM
36-05-00/201).
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71-00-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(6) S 862-130-C00Remove the electrical power, if it is not necessary (AMM 24-22-00/201).
(7) S 862-131-C00If the fan cowl panels are open, close the fan cowl panel (AMM 71-11-02/201).
(8) S 862-132-C00If the thrust reverser is open, close the thrust reverser (AMM 78-31-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-00-00
ALL ú ú C11 Page 274 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
TASK 71-00-00-802-133-C00
7. Power Plant Operation - Cold Weather____________________________________
A. General
(1)
This procedure gives the instructions that are necessary to operate the engine during cold weather conditions. These instructions give the information, techniques, and additional procedures to supplement the usual operation procedure.
(2)
During cold weather operation, you can prevent damage to the engine if you do these steps:
(a)
Use the inlet cover and the exhaust cover.
(b)
Make sure the rotors are not locked before you start the engine.
(c)
You must prevent or remove the snow and ice that can collect around the inlet cowl.
(3)
Ice formation in the engine inlet is one of the principal hazards during cold weather engine operation.
(a) Snow that is blown into a cooling engine can become ice if it melts and freezes again. 1) This ice formation can lock the rotor blades to the stator
case. 2) This ice formation can cover the surface of the rotor blades and cause the blades to become unbalanced.
(4)
Rain and high winds that cause a large temperature decrease in a small amount of time can cause the ice to form in the engine and lock the rotors.
(5)
Ice formation during engine operation can occur because of the large airflows and the suction at the engine inlet.
(a)
This is very dangerous during engine operation at high power settings and static conditions on the ground.
(b)
The suction action decreases the air pressure with a subsequent decrease in the air temperature.
(c)
The evaporative cooling and the temperature decrease from the suction causes the ice to form when the water droplets hit the spinner, fan blades, and guide vanes.
(6)
When the engine is not operated, there is a possibility of foreign object damage (FOD) or snow/rain ingestion for some conditions.
(a)
It is recommended that the engine inlet and exhaust covers are installed when it is practical and necessary.
(b)
It is recommended that the airplane is pointed into the prevailing wind when it is parked for a long time.
(7)
During heavy snowstorms, the engine must be shut down in forward thrust to prevent ice formation on the thrust reverser cascade vanes, blocker doors, and linkages.
(8)
Jet engines do not usually need to be preheated and reliable starts can be done with the usual start procedures.
(a) It may be necessary to preheat the engine for these conditions: 1) To free ice-locked rotors. 2) To remove the snow and the ice from the cowling and the
thrust reverser external surfaces and joints.
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本文链接地址：737-300 400 500 AMM 飞机维护手册 动力装置 POWER PLANT 1(41)
