AD 90-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dornier Luftfahrt GmbH | Do 28 D | Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes |
| aircraft | Dornier Luftfahrt GmbH | Do 28 D-1 | Airworthiness Directives; DORNIER Models Do28D and Do28D-1 Airplanes |
Unsafe Condition
Engine mount failure due to loose or damaged rivets at the riveted connections between the L-section and formed sheet of the right-hand and left-hand engine mounts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 50 hours time-in-service after the effective date, visually inspect the riveted connections. If loose or damaged rivets are found, remove and replace damaged rivets, replace 3.2mm universal/Huck blind rivets with 4.0mm steel blind rivets per Dornier Service Bulletin 1131-1613, and reinspect every 100 hours TIS. If no issues, reinspect every 100 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours time-in-service after the effective date of this AD
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Affected Aircraft
Dornier Luftfahrt GmbH Models Do28D and Do28D-1 (all serial numbers)
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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