AD 91-21-08
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
Corrosion and cracks in the tailplane lower skin panel and stringers could reduce structural integrity of the tailplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial external and internal visual inspections per British Aerospace Alert Service Bulletin 55-A-PM5827, Issue 2, to detect corrosion and cracks. Repeat external inspections every one year and internal inspections every three years. Repair corrosion within specified limits by restoring protective treatment, repair with FAA approval if outside limits, and inspect/repair cracked areas with FAA approval before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to the latest of: 90 days after AD effective date, one year after last AD 90-08-18 external inspection, or ten years after airplane manufacture for external inspections; and 270 days after AD effective date, three years after last AD 90-08-18 internal inspection, or ten years after airplane manufacture for internal inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
British Aerospace Model BAC 1-11 200 and 400 Series airplanes with Modification PM1573 incorporated.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.