(25)
 AMM 33-51-04/201, Power Supply - Battery Pack

 (26)
 AMM 49-11-00/201, APU Starting and Operation

 (27)
 AMM 71-00-00/201, Power Plant

 C. Equipment
 (1)  MARK I COLDBUSTER Heater - External Cabin, Trailer Mounted, Diesel Powered, Spencer Industries, Inc. (Vendor Code 12008) 8410 Dallas Ave. S., Seattle WA 98108-4423
 D. Consumable Materials
 (1) D00109 Oil, Aircraft turbine engine, synthetic base - MIL-L-7808
 E. Access
 (1)  
Location Zones
 100 Lower Half of Fuselage
 200 Upper Half of Fuselage
 300 Empennage
 400 Power Plant and Nacelle Struts
 500 Left Wing
 600 Right Wing
 700 Landing Gear and Landing Gear Doors
 800 Doors

 (2)  
Access Panels

 (a)  117A Main Equipment Center Access Panel
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747-400 MAINTENANCE MANUAL
 (b)  
191NL Air Conditioning Access Door

 (c)  
192HR Air Conditioning Access Door

 F. Procedure
 S 663-041
 CAUTION: IF YOU CAN DRAIN THE FUEL FROM THE DRAIN VALVE AFTER YOU
_______ APPLIED HOT AIR TO THE EXTERIOR FOR 3 TO 5 MINUTES, DO NOT THINK THAT ALL THE ICE IS MELTED. THE ICE ADJACENT TO THE DRAIN VALVE UNIT CAN MELT AND LET SOME WATER AND FUEL TO FLOW FROM THE DRAIN. BUT, A PIECE OF ICE CAN STAY BEHIND. IF THE FUEL DOES NOT FLOW FROM THE DRAIN, CONTINUE TO APPLY HOT AIR FOR A SHORT TIME, AND FREQUENTLY DO A CHECK OF THE FLOW FROM THE DRAIN. CATCH THE FUEL IN A CONTAINER AND MAKE SURE ALL OF THE WATER IS REMOVED.
 THE HEAT APPLIED TO THE SUMP DRAIN VALVES FOR THE OUTBOARD MAIN AND RESERVE TANKS WILL NOT REMOVE THE ICE WHICH HAS COLLECTED IN THE TANK SUMP OR IN THE DRAIN LINE BETWEEN THE TANK SUMP AND VALVE. TO REMOVE THIS ICE, YOU MUST PUT THE AIRPLANE IN A WARM HANGAR FOR SUFFICIENT TIME TO MELT THE ICE. THEN DRAIN THE SUMPS UNTIL THE WATER IS REMOVED.
 (1)  
In cold weather drain the fuel tank sumps prior to refueling to remove water from the fuel tanks if the airplane has been idle for more than 45 minutes prior to refueling. Drain the fuel tank sumps again after refueling if the airplane has been idle for 2 hours or more after refueling, prior to departure (AMM 12-11-03/301).

 (2)  
Do the Cold Weather Maintenance procedure (AMM 12-33-01/310).

 S 553-043

 (3)  
Put the airplane back to a serviceable condition after storage (AMM 10-11-02/201).

 S 883-044

 (4)  
If the ambient temperature is -40°F (-40°C) or below within the last 12 hours, do the steps that follow:

 S 553-042
 (a)  Secure the lavatory doors in the open position.
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MAINTENANCE MANUAL

 CAUTION: THE AIR ENTERING THE CONDITIONED AIR GROUND SERVICE PORT
_______ MUST NOT EXCEED 158°F (70°C) AND THE PRESSURE MUST NOT EXCEED 15 INCHES (38 CENTIMETERS) OF WATER AT THE POINT WHERE THE AIR ENTERS THE BODY OF THE AIRPLANE.
 (b)  For ground equipment with multiple heating hoses (YMP-350), do the steps that follow:
 NOTE: It will take approximately 60 minutes to raise the
____ flight deck temperature from -54°F (-65°C) to -4°F (-20°C) with the YMP-350 heating unit.
 1)  Put the outflow valve to the OPEN position.
 2)  Connect one heating hose to the Air Conditioning Access Door, 192HR or the Air Conditioning Access Door, 191NL conditioned air ground service panel.
 3) Insert two heating hoses in the main equipment center through the access panel 117A. 4) Make sure you maintain the flight deck temperature at or above -4°F (-20°C) for 30 minutes.
 CAUTION: THE AIR ENTERING THE CONDITIONED AIR GROUND SERVICE PORT
_______ MUST NOT EXCEED 158°F (70°C) AND THE PRESSURE MUST NOT EXCEED 15 INCHES (38 CENTIMETERS) OF WATER AT THE POINT WHERE THE AIR ENTERS THE BODY OF THE AIRPLANE.
　
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