AD 57-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 240 Series | CONVAIR Models 240/340 Series Aircraft |
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | CONVAIR Models 240/340 Series Aircraft |
Unsafe Condition
Failure of the nose landing gear drag strut pivot shaft sleeve (Convair P/N 240-5257112) due to a fatigue crack developing at the relief radius undercut of the shoulder of the bearing surface at the threaded end, caused by the 1.06-inch counterbore being drilled beyond acceptable limits.
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Required Actions
Inspect the nose landing gear pivot shaft sleeve to measure the distance from the threaded end to the intersection of the pilot hole and the counterbore bottom. Replace or further inspect sleeves with dimensions below specified limits (minimum 4.1 inches for long threaded ends, 3.5 inches for short). X-ray or remove unsatisfactory parts for magnaflux inspection; reinstall only if no cracks and material distance exceeds 0.350 inch.
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Compliance Time
As soon as possible but not later than September 1, 1957, unless already accomplished.
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Affected Aircraft
All Convair 240/340 Series aircraft incorporating nose landing gear pivot shaft sleeve P/N 240-5257112.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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