AD Amdt-39-9415
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland | DHC-6 | Airworthiness Directives; de Havilland DHC-6 Series Airplanes |
Unsafe Condition
Separation of the horizontal stabilizer from the airplane caused by a cracked attachment fitting, leading to subsequent loss of control of the airplane.
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Required Actions
Inspect horizontal stabilizer attachment fittings for cracks or loose rivets at specified intervals. Replace cracked fittings with specified part numbers and incorporate Modifications 6/1890, 6/1891, and 6/1892. For airplanes with Modifications 6/1808/6/1809, inspect rivets and incorporate the same modifications within specified times to terminate inspections.
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Compliance Time
Within 50 hours TIS after effective date or 800 hours TIS after last inspection, with subsequent inspections every 800 hours TIS. Modifications must be done before further flight if issues found. Airplanes with 6/1808/6/1809 have 400 hours TIS for initial inspection and 2,400 hours TIS to incorporate modifications.
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Affected Aircraft
de Havilland DHC-6 series airplanes (models DHC-6-1, -100, -200, -300, serials 3-820) without Modifications 6/1890, 6/1891, 6/1892 incorporated on all four horizontal stabilizer fittings.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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