Airworthiness directives › 2016-25-26
AD 2016-25-26 Airworthiness Directives; The Boeing Company Airplanes
Models named: MD-90-30. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company Model MD-90-30 airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 6 years after the effective date of this AD, install AOA sensor external case heaters on the existing AOA sensors, install additional wires, and do a functional test and applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD90-30A029, dated November 25, 2015. All applicable corrective actions must be done before further flight. The correct part number for the existing AOA sensor is P/N 0861EW1.
Unsafe condition
This AD was prompted by reports of stick shaker activation at airspeeds that were above the stall protection system's stick shaker schedule. We are issuing this AD to prevent ice formation between the angle-of-attack (AOA) sensor vane and face plate, which could cause both vanes to become immobilized. If both vanes become immobilized, the stall protection system could become unreliable or non-functional, which could result in loss of control of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1