AD 93-21-07
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
Failure of the 'LIFT SPOILER UNLOCKED' indication system due to improper operation of lift spoiler configuration warning microswitches.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a functional test of the lift spoiler configuration warning microswitches in accordance with S.B.27-137. If any microswitch fails, replace the lift spoiler jack spindle with a compliant jack. Ensure entries in maintenance records indicate the serial numbers of affected jacks. Do not install lift spoiler jacks without S.B.27-137 compliance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next scheduled maintenance inspection of the lift spoiler configuration warning microswitches, but no later than 15 months after the effective date of this AD (December 13, 1993).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
British Aerospace Model BAe 146-100A, BAe 146-200A, BAe 146-300A airplanes equipped with lift spoiler jack part numbers P308-45-0002 or P308-45-0102.
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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