Landing
If additional go–around thrust is desired, configure for a “No Engine Bleed Landing.”
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Supplementary Procedures -Air Systems 737 Flight Crew Operations Manual
When below 10,000 feet:
WING ANTI-ICE switch.............................................................OFF
Right PACK switch .................................................................. AUTO
ISOLATION VALVE switch ................................................. CLOSE
Left PACK switch .................................................................... AUTO
Engine No. 1 BLEED air switch..................................................OFF
APU BLEED air switch ................................................................ ON
Engine No. 2 BLEED air switch..................................................OFF
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737 Flight Crew Operations Manual
Anti–Ice Operation
Requirements for use of anti–ice and operational procedures for engine and wing anti–ice are contained in Supplementary Procedures, Adverse Weather Section SP.16.
Cold-Soaked Fuel Frost
Frost may form on the lower and upper wing surfaces due to cold-soaked fuel touching the wing surface after long flights with large fuel loads.
Exterior Safety Inspection - Airplanes with Defined Cold-Soaked Fuel Frost Area
Note: The presence of the painted cold soaked fuel frost area on the upper wing and the inclusion of these procedures in the FCOM do not constitute operational approval. Operators may be allowed to use these procedures by referring to the appropriate regulatory authority for approval or exemption, as required, to implement the procedure.
Surfaces.......................................................................................... Check
Visually inspect the lower and upper wing surfaces.
If there is frost or ice on the lower surface outboard of measuring stick 4, there may also be frost or ice on the upper surface. The distance that the frost extends outboard of measuring stick 4 can be used as an indication of the extent of the frost on the upper surface.
Takeoff with light coatings of cold-soaked fuel frost, up to 1/8 inch (3 mm) in thickness on lower wing surfaces is allowable; however, all leading edge devices, all control surfaces, tab surfaces and balance panel cavities must be free of snow, frost or ice. If the frost on the lower surface is greater than 1/8 inch (3 mm) in thickness, all ice or frost on the wings must be removed using appropriate deicing/anti-icing procedures.
Takeoff with light coatings of cold-soaked fuel frost on upper wing
surfaces is allowable, provided the following conditions are met:
. the frost on the upper surface is less than 1/16 inch (1.5 mm) in thickness
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Supplementary Procedures -Anti–Ice, Rain 737 Flight Crew Operations Manual
.
the extent of the frost is similar on both wings
.
the frost is on or between the black lines defining the allowable cold-soaked fuel frost area (see figure) with no ice or frost on the leading edges or control surfaces
.
the ambient air temperature is above freezing (0°C, 32°F)
.
there is no precipitation or visible moisture (rain, snow, drizzle or fog with less than 1 mile visibility, etc.)
If all the above criteria are not met, all ice or frost on the wings must be removed using appropriate deicing/anti-icing procedures.
Note: If the frost on the lower surface is less than 1/16 inch (1.5 mm) in thickness, the frost on the upper surface will be less than 1/16 inch (1.5 mm) in thickness.
UPPER SKIN FUEL CONTACT AREA
Exterior Safety Inspection - Airplanes without Defined Cold-Soaked Fuel Frost Area
Surfaces ..........................................................................................Check
Visually inspect the lower and upper wing surfaces. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737NG机组操作手册Flight Crew Operations Manual FCOM 1(72)
