AD 99-09-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | Jetstream Model 4101 | Airworthiness Directives; British Aerospace (Jetstream) Model 4101 Airplanes |
Unsafe Condition
Fatigue cracking in the structure that attaches the flap nacelle fairing to the wing flaps, which could result in partial or complete separation of the fairing from the wing flap, and consequent additional structural damage to the airframe and/or reduced controllability of the airplane.
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Required Actions
Perform a detailed visual inspection for discrepancies (cracks, loose rivets, chafing damage, nonstandard parts) and previous repairs per Alert Service Bulletin J41-A57-015. Drill a drain hole in each flap nacelle fairing per the same service bulletin. Apply primer and sealant to the gap between the wing flap and fairing. Correct discrepancies as specified, and modify wing flap structure per Service Bulletin J41-57-017 within 3,000 hours to terminate inspections.
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Compliance Time
Within 60 days after effective date or before 1,500 total hours time-in-service, whichever is later. Modification required within 3,000 hours after effective date.
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Affected Aircraft
British Aerospace (Jetstream) Model 4101 airplanes excluding those with Modifications JM41575B/C.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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