(b)
If the engine oil temperature is colder than -40°C (-40°F), do these steps:
NOTE: At engine oil temperatures that are colder than -40°C
____ (-40°F), you must warm the engine bearings and the engine oil to prevent engine damage. The process to warm the engine bearings is slow.
To look at the oil temperature on EICAS with the engines stopped, turn on the EEC Ground Test Power. If the engine oil temperature is colder than -50°C (-58°F), the EICAS indication will be blank.
1) Warm the engine with a hot air source heater. a) Remove the turbine exhaust cover. b) Install a modified turbine exhaust cover on the turbine
exhaust. c) Install two heater hoses through the modified exhaust
cover holes. d) Install two heater hoses to the heater. e) 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).
f) Apply hot air to the engine core through the turbine exhaust.
2) As an alternate procedure, move the airplane to a warm airplane hangar to warm the engine oil temperature to 0°C or more.
(c) When the engine oil temperature is warmer than 0°C (32°F), do these steps: 1) If the engine is warmed with hot air from a heater:
a) Stop the operation of the hot air source heater.
b) Disconnect the heating hoses.
c) Remove the modified turbine exhaust cover.
d) Install the turbine exhaust cover.
2) If the airplane is in a hangar, move it to the outside ramp.
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3) Supply electrical power (AMM 24-22-00/201). 4) Remove the inlet and exhaust covers and the thrust reverser plugs from the engines. 5) Start the engine with the cold weather procedure (follow these steps).
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.
6) Operate the engine at idle power until the oil temperature is equal to or more than 0°C (32°F) before you move the thrust levers forward and accelerate the engine from idle power. a) 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.
b) 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.
7) Stop the engine.
8) Install the inlet cover.
9) Install the thrust reverser plugs.
10) Install the turbine exhaust cover when the engine exhaust
is sufficiently cool to prevent damage to the cover.
E. Start the Engine with the Cold Weather Procedure
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(1) Do the procedure to prepare the engine for normal engine operation.
(a) Make sure that you follow these procedures for temperatures colder than -30°C (-22°F). 1) Through-flight at temperatures colder than -30°C (-22°F). 2) Return the airplane to service after a cold soak.
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CAUTION: DO NOT OPERATE AN ENGINE, WHICH HAS BEEN AT LOW TEMPERATURES,
_______ IF THE ENGINE DOES NOT ACCELERATE CORRECTLY TO IDLE POWER. IMMEDIATELY SHUTDOWN THE ENGINE IF THE INDICATIONS ARE LESS THAN NORMAL. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ENGINE CAN OCCUR.
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