AD 47-10-37
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
Loosening of the inboard pair of bolts in the outboard fulcrum and the outboard pair of bolts in the inboard fulcrum of each main landing gear, which could lead to reduced clamping force and potential failure of the landing gear structure.
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Required Actions
Periodically check the tightness of specified landing gear fulcrum bolts at intervals not exceeding 500 flight hours using a torque wrench. Maintain a continuous record of torque readings. If any bolt loosens to approximately 900 inch-pounds, remove all 16 fulcrum bolts, countersink fitting holes to 0.064 x 45 degrees, replace bolts, and tighten to 2,300-2,500 inch-pounds. Discontinue 500-hour inspections after corrective action.
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Compliance Time
before further flight
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 serial numbers up to and including 2071.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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