12-33-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
EXTREME COLD WEATHER MAINTENANCE - SERVICING
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1. General
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A. This procedure has these tasks:
(1)
Short term parking at temperatures below -22°F (-30°C).
(2)
Overnight or extended parking (airplane unattended) at temperatures below 5°F (-15°C).
(3)
Return the airplane to service after overnight or extended parking at temperatures below 5°F (-15°C).
(4)
Interior ice removal
B. After every 50 flight hours when you operate continuously in cold weather, you must remove all interior ice.
(1) In the usual operation of the airplane, air comes through the airplane structure. During flight, the water vapor in the air can condense and freeze in the airplane. When you continuously operate the airplane in cold weather, ground temperatures below the freezing point will not let the ice melt. You must do the Interior Ice Removal tasks to find and remove the ice. Too much ice will lower the performance of the airplane below permitted values.
C. In cold weather it is necessary to 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. In cold weather water can freeze, and not let the drain valves open.
TASK 12-33-02-603-001
2. Short Term Parking at Temperatures Below -22°F (-30°C)
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A. General
(1)
Short term parking at temperatures below -22°F (-30°C):
(a) When the cabin and flight deck temperature is maintained above 32°F (0°C) and the engine oil temperature is maintained at 6°F (3°C) above the freeze point or above -40°F (-40°C) while the airplane is on the ground.
(2)
After every 50 flight hours when you operate continuously in cold weather, do the Interior Ice Removal procedure.
NOTE: Removal of the ice buildup will not impact the airplane's
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center of gravity.
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12-33-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
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 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.
(3)
In cold weather it is necessary to drain the fuel tank sumps prior to refueling to remove water from the fuel tanks if the airplane has been idle for more then 45 minutes prior to refueling. Drain the fuel tanks sumps again after refueling if the airplane has been idle for 2 hours or more after refueling, prior to departure (AMM 12-33-01/301).
(4)
When adding fuel, you must use these requirements:
(a) Make sure the fuel temperature is at least 6°F (3°C) above the fuel freeze point or -45.4°F (-43°C), whichever is higher. Use the ASTM method to determine the freeze point.
NOTE: The Fuel Quantity Indicator on the wing fuel station can
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