AD Amdt-39-10691
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | British | Aerospace Model B.121 Series 1, 2, and 3 | Airworthiness Directives; British Aerospace Model B.121 Series 1, 2, and 3 Airplanes |
Unsafe Condition
Fatigue cracking or separation of the wing caused by loose nuts at the wing to fuselage main-spar attachment fittings could result in structural failure of the main spar web area and loss of control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install an inspection opening in the main spar web area, repetitively inspect the area for cracks, repair or replace cracked parts, and install improved design nuts at the wing to fuselage main-spar attachment fittings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
British Aerospace Model B.121 Series 1, 2, and 3 airplanes
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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