AD 77-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | Airworthiness Directives; MCDONNELL DOUGLAS DC-4 and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54A-DC | Airworthiness Directives; MCDONNELL DOUGLAS DC-4 and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54B-DC | Airworthiness Directives; MCDONNELL DOUGLAS DC-4 and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54D-DC | Airworthiness Directives; MCDONNELL DOUGLAS DC-4 and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54E-DC | Airworthiness Directives; MCDONNELL DOUGLAS DC-4 and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54G-DC | Airworthiness Directives; MCDONNELL DOUGLAS DC-4 and C-54 Series Airplanes |
| aircraft | The Boeing Company | DC-4 | Airworthiness Directives; MCDONNELL DOUGLAS DC-4 and C-54 Series 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 specified fire resistance requirements. Acceptable assemblies include Resistoflex SSFR-3800-10, Aeroquip 680-10S, Aeroquip 309009, Aeroquip 309009-8S, Aeroquip 634000-8/-10, or TSO-C42 compliant hose assemblies. Equivalent solutions may be used with FAA approval.
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Compliance Time
The first engine change after June 16, 1977, or October 1, 1977, whichever occurs earlier, unless previously accomplished under AD 55-15-03 as amended by Amendment 55-24 to Part 507.
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Affected Aircraft
MCDONNELL DOUGLAS DC-4 and C-54 series airplanes, including models C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, and DC-4, certificated in all categories and using Hamilton Standard propellers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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