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737-300/400/500MAINTENANCE MANUAL
 S 863-008
 (8)  Install the engine inlet and exhaust covers.
 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 temperatures, the time for the engine to
____ cool to -40°F (-40°C) can be greatly increased by the use of engine inlet and exhaust covers.
 S 203-009
 (9)  
Continue to use the engine oil temperature indicator on P2-2 panel to monitor the engine oil temperature when the engines are not running.

 S 603-010

 (10)
 Fill the CSD or VSCF Generator/Converter with oil as required (AMM 12-13-21/301).

 NOTE: If the CSD or VSCF Generator/Converter is serviced for
____ cold weather operation, use the preferred oil, MIL-L- 7808 instead of MIL-L-23699 lubricant. The only MIL-L-7808 lubricant approved for Sundstrand IDGs is Exxon 2389.
 S 213-011
 (11)
 Visually check the wing lower surface for fuel leaks.

 S 213-012

 (12)
 Visually check the landing gear.

 (a)  Wipe the inner cylinder with a clean cloth to check for hydraulic leakage from the seals.
 S 213-013
 (13) Check the landing gear tire pressure and inflate as required (AMM 12-15-51/301).
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737-300/400/500MAINTENANCE MANUAL
 S 213-014
 (14)
 Check the main landing gear shock strut fluid (AMM 12-15-31/301).

 S 213-015

 (15)
 Check the nose landing gear shock strut fluid (AMM 12-15-41/301).

 S 663-016
 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 THANKS 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.
 (16)
 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 12-33-01/301).

 S 863-017

 (17)
 Do these steps just prior to flight:

 (a) Provide electrical power (AMM 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
 (b)  Turn on the hydraulic system electric motor pumps 30 minutes before starting the engines (AMM 29-15-00/201).
 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 these electric pump switches are in the ON position, on the overhead Hydraulic Control Panel. a) HYD PUMPS - ELEC I b) HYD PUMPS - ELEC 2
 2)  If the hydraulic pressure in one system increases, then drops to zero, do these steps:
　
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