Airworthiness Directive · Amendment 39-21007 · Navigation
the Boeing Company Airplanes
This AD applies to The Boeing Company airplanes, identified in paragraphs (c)(1) through (3) of this AD, certificated in any category.
(1) Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes, as identified in Boeing Alert Service Bulletin 727-34A0247, Revision 1, dated October 1, 2019; except for airplanes having variable numbers QB065, QD191, QD192, QD402, QD403, QD407, and QD410.
(2) Model 757-200, -200PF, -200CB, and -300 series airplanes, as identified in Boeing Alert Service Bulletin 757-34A0611, Revision 1, dated March 22, 2019.
(3) Model 767-200, -300, -300F, and -400ER series airplanes, as identified in Boeing Alert Service Bulletin 767-34A0828, dated December 6, 2018.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 727 airplanes, Model 757 airplanes, and Model 767-200, -300, -300F, and -400ER series airplanes. This AD was prompted by reports of nuisance stick shaker activation while the airplane accelerated to cruise speed at the top of climb. This AD was also prompted by an investigation of those reports that revealed that the angle of attack (AOA) (also known as angle of airflow) sensor vanes could not prevent the build-up of ice, causing the AOA sensor vanes to become immobilized, which resulted in nuisance stick shaker activation. This AD requires a general visual inspection of the AOA sensors for certain AOA sensors, and replacement of affected AOA sensors. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified in paragraph (h) of this AD: Within 36 months after the effective date of this AD or at the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 727-34A0247, Revision 1, dated October 1, 2019; Boeing Alert Service Bulletin 757-34A0611, Revision 1, dated March 22, 2019; or Boeing Alert Service Bulletin 767-34A0828, dated December 6, 2018; as applicable, whichever occurs first, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 727-34A0247, Revision 1, dated October 1, 2019; Boeing Alert Service Bulletin 757-34A0611, Revision 1, dated March 22, 2019; or Boeing Alert Service Bulletin 767-34A0828, dated December 6, 2018; as applicable. All replacements of the affected AOA sensors must be done before further flight.
(1) Where Boeing Alert Service Bulletin 727-34A0247, Revision 1, dated October 1, 2019; Boeing Alert Service Bulletin 757-34A0611, Revision 1, dated March 22, 2019; or Boeing Alert Service Bulletin 767-34A0828, dated December 6, 2018; as applicable, uses the phrase “the original issue date of this service bulletin,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Alert Service Bulletin 727-34A0247, Revision 1, dated October 1, 2019; Boeing Alert Service Bulletin 757-34A0611, Revision 1, dated March 22, 2019; or Boeing Alert Service Bulletin 767-34A0828, dated December 6, 2018; specify to accomplish a general visual inspection of the AOA sensors and to replace affected AOA sensors, a review of the airplane maintenance records is acceptable in lieu of those actions if the part number of the installed AOA sensors can be conclusively determined during that review to have a new or serviceable AOA sensor part number identified in Boeing Alert Service Bulletin 727-34A0247, Revision 1, dated October 1, 2019; Boeing Alert Service Bulletin 757-34A0611, Revision 1, dated March 22, 2019; or Boeing Alert Service Bulletin 767-34A0828, dated December 6, 2018; as applicable.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
