Wing Station Diagram
Figure 6
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CHAPTER
27
FLIGHT
CONTROLS
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FLIGHT CONTROLS
AREA Control Cables PROBLEM Corrosion of carbon-steel cables INDEX PREVENTION VOLUME 2 27-00-02 TERMINATING ACTION (IF ANY)
Flaps Corrosion in trailing-edge-flap ballscrews 27-50-01
SPECIFIC CORROSION PROBLEMS -Figure 1 FLIGHT CONTROLS
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CONTROL CABLES
1. General
A. Control cables are made of thin strands of tinned carbon steel. Cables are
protected by a thin film of grease. Corrosion can occur where the grease
film is not there and the cables are open to moisture.
2. Corrosion Prevention
A. At regular times, wipe off the grease with a dry, lint-free cloth and exam-ine the cable for corrosion.
B. Apply a thin film of grease over the length of the cable per 12-21-31 of the
Maintenance Manual after you examine the cable.
C. If corrosion starts, refer to Structural Repair Manual.
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FLAPS
1. General
A. Corrosion can occur in the trailing edge flap ballscrews. This can be caused
when the ballscrew is not lubricated sufficiently. The corrosion can
decrease the size of the balls in the unit, which can cause malfunctions.
2. Corrosion Prevention
A. Make sure the ballscrews are lubricated at the correct frequency as speci-fied in the Maintenance Manning Document. There are two tube fittings on the
ballnut, one for each of the two independent ball circuits. Lubrication of
one ball circuit does not supply lubrication to the other circuit. Thus, be
sure to apply lubricant at each fitting.
B. When you wash the trailing edge flap or wheel wells, be careful not to wash 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 防腐手册 CORROSION PREVENTION MANUAL(6)
