AD 61-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Air Trading Corporation | Army B-34 | LOCKHEED Models PV-1 and B-34 |
| aircraft | Air Trading Corporation | Navy PV-1 | LOCKHEED Models PV-1 and B-34 |
Unsafe Condition
Main landing gear lower drag strut P/N 112004 is understrength due to lack of specified heat treatment, resulting in potential failure.
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Required Actions
Within 50 hours' time in service from November 3, 1961, test struts P/N 112004 for heat-treated tensile strength of 150,000 to 170,000 p.s.i. Replace struts with heat-treated parts or P/N 125715 if strength is below 150,000 p.s.i. before further flight except ferry flight. Spare struts must also be tested and replaced as required.
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Compliance Time
Within the next 50 hours' time in service from the effective date of this directive
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Affected Aircraft
Lockheed Models PV-1 and B-34 with main landing gear lower drag struts P/N 112004
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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