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CESSNA 210L SDR # 20040423003
Lubrication Type Unclear
The main landing gear down-lock spring assembly sliding action was restricted by accumulation of dirt and debris. The down-lock, P/N 124160-1, was unable to fully engage, resulting in an "unsafe" gear indication. Inspection revealed wet lubrication attracted debris and dirt in the spring assembly concentric sleeve and spring.
Section 2 of the Cessna inspection manual is vague regarding lubrication type and applicability, and states in part - "…and any other friction point obviously requiring lubrication".
The submitter recommends that dry lubrication be used in this area and increased awareness of individual inspection programs for aircraft operating in "off-airport" locations, such as gravel and dusty strips.
DIAMOND DA20 A1 SDR # 20040203013
Muffler Obstructed
When the muffler tailpipe was found nearly snapped off; a detailed examination revealed that the internal baffles in the muffler were broken off at the weld. The muffler baffles obstructed the exhaust outlet port creating a pressure build-up inside the muffler and caused loss of engine power.
The operator has started a fleet-campaign and now carries out a "tap-test" inspection to determine if the muffler baffles are excessively loose or broken off.
The exhaust system components are subjected to extreme temperatures, and the resulting expansion and contraction produce stresses that often result in cracks and distortion due to warpage. Regular and thorough inspections are especially important to detect internal muffler failures.
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