AD 87-17-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | BAe 146-100A | Airworthiness Directives; BRITISH AEROSPACE Model BAe-146 Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | BAe 146-200A | Airworthiness Directives; BRITISH AEROSPACE Model BAe-146 Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | BAe 146-300A | Airworthiness Directives; BRITISH AEROSPACE Model BAe-146 Series Airplanes |
Unsafe Condition
Loss of primary or secondary drive of the flap system torque limiter output due to excessive backlash in the torque limiter drive sprocket splines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect torque limiter drive sprocket splines for excessive backlash and replace if necessary per BAe Alert Service Bulletin 27-A54, Rev 1. Repeat inspections per paragraphs 2A (every 600 landings) and 2B (every 300 landings) of the same bulletin. Modify flap drive system per BAe Modification Service Bulletin 27-54-70193A, Rev 1 to terminate repetitive inspections.
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Compliance Time
within 60 days after the effective date of this AD
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Affected Aircraft
BAE Systems (Operations) Limited Model BAe 146-100A, BAe 146-200A, BAe 146-300A airplanes listed in BAe-146 Service Bulletin 27-54-70193A, Rev 1
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
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