AD 77-10-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 18 | LOCKHEED Model 18 Airplanes |
Unsafe Condition
Flexible hose components of propeller feathering lines forward of the firewall may fail due to damage from a powerplant fire, compromising fire resistance integrity.
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Required Actions
Replace flexible hose components of propeller feathering lines forward of the firewall with lines and fittings meeting fire resistance requirements of specified hose assemblies. Acceptable assemblies include Resistoflex SSFR-3800-10, Aeroquip 680-10S with protective sleeves, Aeroquip 309009, 309009-8S, 634000-8/-10, AE2460001, or TSO-C42 compliant hose assemblies with appropriate pressure ratings. Equivalent assemblies may be used with FAA approval.
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Compliance Time
by the first engine change after June 16, 1977 or October 1, 1977, whichever occurs earlier, unless previously accomplished in accordance with AD 55-15-03 as amended by Amendment 55-24 to Part 507
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Affected Aircraft
Lockheed Model 18 airplanes, certificated in all categories, using Hamilton standard propellers. Excludes feathering lines in Zone I with steel tubing where flexible hose assemblies are forward of the cylinders and connecting to the governor.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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