Navigation - Angle of Attack Sensors - Inspection / Replacement
- Published
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Boeing Model 727, 757, and 767 airplanes must perform a general visual inspection of the AOA sensors and replace any sensors identified as affected. Compliance with this AD is required by February 3, 2020, with specific compliance times varying by airplane model but not exceeding 36 months from the effective date. Maintenance records review may assist in determining sensor part numbers for compliance.
Summary
Federal Register Volume 84, Number 249 (December 30, 2019) is a final rule airworthiness directive issued by the FAA addressing certain Boeing Model 727, 757, and 767 series airplanes. The directive targets angle of attack (AOA) sensors that may ice over, causing sensor vane immobilization and resulting in nuisance stick shaker activation. This AD mandates inspection and replacement of affected AOA sensors to ensure flight safety.
What changed
This new airworthiness directive introduces mandatory general visual inspections of specific AOA sensors and requires replacement of those found affected by ice build-up. It updates previous service information by referencing Boeing Alert Service Bulletin 727-34A0247, Revision 1, dated October 1, 2019, which adds airplanes to the effectivity list but does not expand the AD applicability. The AD also provides credit for prior compliance using the earlier service bulletin revision.
Why it matters
This AD is critical for aviation professionals because ice accumulation on AOA sensors can lead to false stall warnings and potential loss of airplane controllability. Operators and maintenance teams must address this unsafe condition to prevent nuisance stick shaker activations that could compromise flight safety. Compliance ensures reliable sensor data and maintains regulatory adherence.
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