AD 2021-25-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Reports of nuisance stick shaker activation while the airplane was accelerating to cruise speed at the top of a climb, caused by the angle of attack (AOA) sensor vanes freezing and malfunctioning due to insufficient heat in certain AOA sensors.
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Required Actions
Inspecting the AOA sensors for certain part numbers or vane shapes, and replacing any affected AOA sensor with a new or serviceable sensor.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 737-200 and -200C series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-27A1324, dated March 2, 2021.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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