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747-400 MAINTENANCE MANUAL
 S 863-018
 (16) Do the steps that follow just prior to flight:
 CAUTION: DO NOT APPLY GROUND ELECTRICAL POWER BEFORE THE
_______
 TEMPERATURE HAS REACHED -4°F (-20°C).

 (a)  
Provide electrical power (AMM 24-22-00/201).

 (b)  
Turn on the hydraulic system electric motor pumps and air driven pumps, as applicable 30 minutes before starting the engines (AMM 29-11-00/201).

 NOTE: This will make sure the hydraulic system operates
____ normally and will prolong the life of the components.
 Leave the pumps running until the engine-driven pumps
 are operating.
 1)  Make sure the electric pump and air driven pump switches, as applicable are in the ON position, on the overhead Hydraulic Control Panel.
 2)  If the hydraulic pressure in one system increases, then drops to zero, do the steps that follow:
 NOTE:____Repeat the steps a maximum of three times. After three times (cycles), you must find the cause of the pressure drop.
 a) Turn the electric motor pump OFF. b) Turn the electric motor pump ON. 3) Leave the motor pumps running until the engine-driven pumps are operating.
 S 863-019
 (17) At temperatures below -22°F (-30°C), pump the brake pedals eight (8) times shortly before starting the engines. At each wheel, verify extension/retraction of brake pistons.
 (a)  If brake operation is not normal, do the steps that follow: 1) Provide local warming to the brake.
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747-400 MAINTENANCE MANUAL
 2)  Do the Antiskid/Autobrake System - Functional Test (AMM 32-42-00/501).
 NOTE: Do the tasks for the brakes only:
____ System Interface, Antiskid Brake Release, and Autobrake Application.
 To do an operational check with the Antiskid Brake Release task, you do not need to install pressure gages at each brake. As an alternative to this, make sure that there is brake piston movement.
 3) Repeat the test until proper operation is observed. 4) If the difficulty continues, replace the brake. a) Do the Brake Disconnect Removal procedure (AMM 32-41-17/401). b) Do the Brake Disconnect Installation (AMM 32-41-17/401). c) Do the Main Landing Gear Brake Removal (AMM 32-41-15/401). d) Do the Main Landing Gear Brake Installation (AMM 32-41-15/401).
 S 863-020
 (18)
 Prepare the engines for operation (AMM 71-00-00/201).

 S 863-021

 (19)
 Use the EICAS engine oil temperature indicator to monitor the engine oil temperature.

 (a)  
To view the engine oil temperature when the engines are not running, turn on the EEC ground test power.

 (b)  
If the engine oil temperature shown on the EICAS
 approaches -27.4°F (-33°C), do the steps that follow:
 1) Remove the inlet and exhaust covers.

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747-400 MAINTENANCE MANUAL
 CAUTION: MAKE SURE THE ENGINE CORE TEMPERATURE IS
_______ ABOVE -27.4°F (-33°C) BEFORE YOU START THE ENGINE. IF THE ENGINE CORE TEMPERATURE IS BELOW -27.4°F (-33°C), DAMAGE TO THE ENGINE BEARINGS CAN OCCUR.
 2)  Heat the engine core to a minimum of -27.4°F (-33°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.
　
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