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737-300/400/500MAINTENANCE MANUAL
(b) After the airstair is in the stowed postion, do these steps: 1) Get access to the airstair through the Electronic Equipment Access Door, 1201L. 2) Check for water on the drip shields and around the electronic equipment. 3) Remove all water on the drip shields and around electronic equipment.
4) Go out of the Electronic Equipment Bay and close the Electronic Equipment Access Door, 1201L.
S 883-004
(4) Do one of these steps to maintain the cabin temperature at or above 32°F (0°C):
(a)
Use the APU or a ground air source to run both ECS packs:
1) Do this procedure: Use External Source to Supply Conditioned Air (AMM 21-00-00/201) or Airplane Air-Conditioning Packs To Supply Conditioned Air (AMM 21-00-00/201).
(b)
Use a heater, MARK I COLDBUSTER to heat the airplane through the ground air service connection panel, 1304L.
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(5) Install the engine inlet and exhaust covers as soon as possible after landing.
NOTE: Keep the engine covers in a warm location before you install
____ them on the airplane. Covers that are cold or frozen may be difficult to install, and may freeze to the engine inlet and exhaust.
NOTE: At very low ambient air temperatures, the time for the engine
____ oil to cool to -40°F (-40°C) can be greatly increased by the use of engine inlet and exhaust covers.
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(6) Use the engine oil temperature indicators on the P2-2 display panel to monitor the engine oil temperature.
(a) If the engine oil temperature shown on P2-2 panel is
below -40°F (-40°C), do these steps:
1) Remove the inlet and exhaust covers.
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737-300/400/500MAINTENANCE MANUAL
CAUTION: MAKE SURE THE ENGINE CORE TEMPERATURE IS ABOVE -40°F
_______ (-40°C) BEFORE YOU START THE ENGINE. IF THE ENGINE OIL TEMMPERATURE IS BELOW -40°F (-40°C), DAMAGE TO THE ENGINE BEARINGS CAN OCCUR.
2) Heat the engine core to a minimum of -40°F (-40°C) with a heater, MARK I COLDBUSTER or suitable substitute. a) If you use a multiple hose ground cart heater, MARK I
COLDBUSTER, direct one heater hose in the inlet to heat the engine core, and one heater hose on the engine gearbox.
b) If you use a multiple hose ground cart (YMP-350 heater), direct one heater hose in the inlet to heat the engine core, and one heater hose on the engine gearbox.
c) If you use a single hose ground cart (Herman Nelson heater), direct the heater hose on the engine gearbox.
3) Make sure the engine oil temperature on the P2-2 panel is above -40°F (-40°C) to prevent damage to the engine bearings when you start the engines. a) See cold weather starting procedures
(AMM 71-00-00/201). b) See engine operating limits (AMM 71-00-00/201).
(b)
Start the engines (Automatic Start) (AMM 71-00-00/201).
(c)
Run the engines at idle until the oil temperature is at or above 86°F (30°C).
NOTE: To idle the engines, the oil temperature must be at
____
least -40°F (-40°C).
(d)
Make sure the engine oil temperature is at least 32°F (0°C) before you increase the power above idle.
(e)
Before shutdown of the engines, run the engines at idle for a minimum of 10 minutes.
NOTE: This will let the engine temperature stabilize.
____
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(7) Use the procedures in the task: Normal Power Plant Operation Engines (AMM 71-00-00/201) to shut down the engine (usual shutdown).
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