Airworthiness Directive · Amendment 39-21454 · Flight controls
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 757-200, -200PF, -200CB, and -300 series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 757-27A0158 RB, dated July 9, 2020.
The FAA is superseding Airworthiness Directive (AD) 2017-26- 10, which applied to certain The Boeing Company Model 757 airplanes. AD 2017-26-10 required deactivating the spoiler control module (SCM) relays and capping and stowing the associated wiring on certain airplanes. This AD requires repetitive operational tests of the spoiler inhibit function. For certain airplanes, this AD requires installing a new relay bracket assembly, making changes to the wire bundles for certain SCMs, installing new SCMs, measuring the clearance between a wire bundle and the top of the new relay bracket assembly, and applicable on-condition actions. For a certain other airplane, this AD requires changing certain wire bundles. This AD was prompted by reports of unwanted lateral oscillations during landing operations, and the development of wiring changes for certain SCMs, which will improve the lateral handling qualities of the airplane during approach and landing. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 757-27A0158 RB, dated July 9, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 757-27A0158 RB, dated July 9, 2020.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 757-27A0158, dated July 9, 2020, which is referred to in Boeing Alert Requirements Bulletin 757-27A0158 RB, dated July 9, 2020.
(1) Where Boeing Alert Requirements Bulletin 757-27A0158 RB, dated July 9, 2020, uses the phrase “the original issue date of the Requirements Bulletin 757-27A0158 RB,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Alert Requirements Bulletin 757-27A0158 RB, dated July 9, 2020, specifies in figure 4 (sheet 3 of 3), step 2, to drill a quantity of six holes, this AD requires drilling two holes.
In the event that the spoiler inhibit function (SIF) system as modified by this AD is inoperable, an airplane may be operated as specified in the operator's existing FAA-approved MEL, provided the operator's existing FAA-approved MEL includes provisions that address the modified SIF system.
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
