Airworthiness Directive · Amendment 39-19025 · Flight controls
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 737-700 and -700C series airplanes identified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD, certificated in any category, except for airplanes on which winglets are installed as specified in Supplemental Type Certificate (STC) ST00830SE, Amendment dated on or after April 21, 2015.
(1) Airplanes having STC ST00830SE installed (Aviation Partners Boeing blended winglets), as identified in Aviation Partners Boeing Service Bulletin AP737-27-002, Revision 4, dated April 24, 2017.
(2) Airplanes identified in Boeing Alert Service Bulletin 737-27A1306, dated September 10, 2015, as revised by Boeing Alert Service Bulletin 737-27A1306, Revision 1, dated December 14, 2016.
(3) Airplanes identified in Aviation Partners Boeing Service Bulletin AP737-34-005, dated July 17, 2015.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-700 and -700C series airplanes. This AD was prompted by a report that, for certain airplanes, the nose-up pitch trim limit and associated warning will allow the horizontal stabilizer position to be set outside acceptable limits for a mis-trimmed takeoff condition. This AD requires, depending on airplane configuration, replacing certain pitch trim light plates, relocating certain position warning horn switches, revising certain software, removing a certain placard, and doing related investigative and corrective actions if necessary. We are issuing this AD to address the unsafe condition on these products.
(1) For airplanes identified in paragraph (c)(1) of this AD, except for airplanes also identified in paragraph (c)(2) of this AD: Within 72 months after the effective date of this AD, relocate the position warning horn switches of the horizontal stabilizer, replace the pitch trim light plates on the flight deck control stand, revise the software, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Aviation Partners Boeing Service Bulletin AP737-27-002, Revision 4, dated April 24, 2017, except as specified in paragraph (j) of this AD. Do all applicable related investigative and corrective actions before further flight.
(2) For airplanes identified in paragraph (c)(2) of this AD, except for the airplane having line number 3128: Within 72 months after the effective date of this AD, relocate the position warning horn switches of the horizontal stabilizer, replace the pitch trim light plates on the flight deck control stand, revise the software, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-27A1306, dated September 10, 2015, as revised by Boeing Alert Service Bulletin 737-27A1306, Revision 1, dated December 14, 2016; and Aviation Partners Boeing Service Bulletin AP737-27-002, Revision 4, dated April 24, 2017; except as specified in paragraph (j) of this AD. Do all applicable related investigative and corrective actions before further flight.
For airplanes identified in paragraph (c)(3) of this AD: Within 72 months after the effective date of this AD, revise the software and remove the placard, in accordance with the Accomplishment Instructions of Aviation Partners Boeing Service Bulletin AP737-34-005, dated July 17, 2015.
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.
