AD 77-14-17 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dornier-Werke GmbH | Dornier Luftfahrt GmbH | Do 27 Q-6 | Airworthiness Directives; Dornier GmbH Model Do 27 and Do 28 Series Airplanes |
| aircraft | Dornier-Werke GmbH | Dornier Luftfahrt GmbH | Do 28 A-1 | Airworthiness Directives; Dornier GmbH Model Do 27 and Do 28 Series Airplanes |
| aircraft | Dornier-Werke GmbH | Dornier Luftfahrt GmbH | Do 28 B-1 | Airworthiness Directives; Dornier GmbH Model Do 27 and Do 28 Series Airplanes |
| aircraft | Dornier-Werke GmbH | Dornier Luftfahrt GmbH | Do 28 D | Airworthiness Directives; Dornier GmbH Model Do 27 and Do 28 Series Airplanes |
| aircraft | Dornier-Werke GmbH | Dornier Luftfahrt GmbH | Do 28 D-1 | Airworthiness Directives; Dornier GmbH Model Do 27 and Do 28 Series Airplanes |
Unsafe Condition
Defective DORNIER fuel and oil hoses manufactured to specification LN9226 may lead to possible engine failure or sudden seizure of an engine.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect each DORNIER fuel and oil hose manufactured to specification LN9226 in the first quarter of 1970 and thereafter, within 10 hours time-in-service after the AD effective date or within 25 hours since the last inspection under AD 77-14-17, whichever comes first, and every 25 hours thereafter until exceeding 50 hours TIS. Replace defective hoses with serviceable DORNIER or TSO-C53a, Type C hose before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours time-in-service (TIS) after the effective date of this AD, or within the next 25 hours TIS since the last inspection in accordance with AD 77-14-17, whichever occurs first, and every 25 hours thereafter until attaining more than 50 hours TIS on each hose
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Dornier-Werke GmbH | Dornier Luftfahrt GmbH Model Do 27 Q-6, Do 28 A-1, Do 28 B-1, Do 28 D, Do 28 D-1 series (all serial numbers) airplanes certificated in any category.
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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