AD 61-03-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Aeronautics Company | 1649A-98 | LOCKHEED Model 1649A Aircraft |
Unsafe Condition
Failure of the right-hand vent float valve in the No. 7 fuel tank could allow fuel spillage or improper fuel distribution, leading to reduced fuel system reliability.
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Required Actions
Modify the right-hand vent float valve of the No. 7 tank by removing the float assembly and replacing the valve spring with P/N 22-0337-1, or replace the original right-hand valve assembly with LAC P/N 634024-5. Compliance required within 400 hours of time in service after February 13, 1961.
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Compliance Time
within 400 hours of time in service after the effective date of this directive
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Affected Aircraft
Lockheed Model 1649A-98 aircraft, all serial numbers
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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