AD 91-21-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | BAe 146-100A | Airworthiness Directives; British Aerospace Models BAe 146-100A, 146-200A, and 146-300A Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | BAe 146-200A | Airworthiness Directives; British Aerospace Models BAe 146-100A, 146-200A, and 146-300A Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | BAe 146-300A | Airworthiness Directives; British Aerospace Models BAe 146-100A, 146-200A, and 146-300A Series Airplanes |
Unsafe Condition
Chafing of the extinguisher pipe and clamp assemblies between the two fire extinguisher bottles in the engine nose cowls and inadequate clearance between the three pipe assemblies and adjacent equipment and structure could result in improper discharge of the engine fire extinguisher medium during an engine fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 30 days after the effective date, perform a visual inspection for chafing of the extinguisher pipe and clamp assemblies and ensure adequate clearance between the pipe assemblies and adjacent equipment/structure per British Aerospace Inspection Service Bulletin 26-A29, Rev 2. Prior to installing any nose cowl or engine/nose cowl combination on an operational airplane, perform the same inspection. Repair or replace damaged assemblies before further flight as required.
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Compliance Time
Within 30 days after the effective date of this AD, and prior to further flight if damage is found
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Affected Aircraft
British Aerospace Models BAe 146-100A (Serial Numbers up to E1152), BAe 146-200A (Serial Numbers up to E2156), and BAe 146-300A (Serial Numbers up to E3157)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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