AD 47-10-30
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
Fuel tank surge box flapper valves (LAC P/N 285750) may fail, leading to potential fuel leakage or improper fuel distribution.
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Required Actions
Replace fuel tank surge box flapper valves LAC P/N 285750 with new type valve LAC P/N 285750-600. Compliance must follow Lockheed Service Instructions 49/SI-15 (revised August 10, 1946) or 49/SI-15A (revised August 3, 1946).
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Compliance Time
prior to April 1, 1947
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Affected Aircraft
Lockheed Aircraft Corporation Model 49-46, serial numbers 2047 up to and including 2075, and serials prior to 2047 with 68092 surge box flapper valves replaced by 285750 valves per Lockheed SI-15 dated June 18, 1946.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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