AD 91-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus SAS | BAC 1-11 200 Series | Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes |
| aircraft | Airbus SAS | BAC 1-11 400 Series | Airworthiness Directives; British Aerospace Model BAC 1-11 200 and 400 Series Airplanes |
Unsafe Condition
Cracks in the skin and cleats at the front and rear extremities of the twelve stiffeners could lead to loss of cabin pressurization.
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Required Actions
Perform visual inspections of skin and cleats at specified intervals per British Aerospace Alert Service Bulletin 53-A-PM5990. Repair skin cracks and replace cracked cleats prior to further flight. Install Modification PM5629 Part (a) before 85,000 landings.
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Compliance Time
Prior to the accumulation of 24,000 landings (or within 3,000 landings after the effective date, whichever is later) for 7.5 psi airplanes; prior to 16,000 landings (or within 2,000 landings after the effective date, whichever is later) for 8.2 psi airplanes. Thereafter at intervals not exceeding 3,200 or 2,400 landings respectively. Install PM5629 before 85,000 landings.
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Affected Aircraft
British Aerospace Model BAC 1-11 200 and 400 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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