Airworthiness Directive · Amendment 39-18727 · Auto flight
The Boeing Company Airplanes
This AD applies to The Boeing Company airplanes, certificated in any category, identified in paragraphs (c)(1) through (c)(5) of this AD.
(1) Model 747-400, 747-400D, and 747-400F series airplanes, as identified in Boeing Special Attention Service Bulletin 747-22-2256, Revision 1, dated January 6, 2016 (“SASB 747-22-2256 R1”).
(2) Model 757-200, -200PF, -200CB, and -300 series airplanes, as identified in Boeing Special Attention Service Bulletin 757-22-0096, Revision 1, dated February 8, 2016 (“SASB 757-22-0096 R1”).
(3) Model 767-200, -300, -300F, and -400ER series airplanes, as identified in Boeing Special Attention Service Bulletin 767-22-0143, Revision 2, dated May 25, 2016 (“SASB 767-22-0143 R2”), except those Model 767-300 and -300F series airplanes with winglets installed in accordance with Supplemental Type Certificate (STC) ST01920SE (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/59027f43b9a7486e86257b1d006591ee/Body/0.48A!OpenElement&FieldElemFormat=gif), and that are identified in Aviation Partners Boeing (APB) Service Bulletin AP767-22-005, Revision 1, dated June 16, 2015 (“SB AP767-22-005 R1”).
(4) Model 767-300 and -300F series airplanes, as identified in Boeing Special Attention Service Bulletin 767-22-0146, Revision 1, dated June 25, 2015 (“SASB 767-22-0146 R1”).
(5) Model 767-300 and -300F series airplanes with winglets installed per STC ST01920SE (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/59027f43b9a7486e86257b1d006591ee/Body/0.48A!OpenElement&FieldElemFormat=gif) having part number (P/N) 2276-COL-AF2-03 installed, as identified in APB Service Bulletin AP767-22-005, dated May 8, 2015; or SB AP767-22-005 R1.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400, 747-400D, and 747-400F series airplanes; Model 757 airplanes; and Model 767-200, -300, -300F, and - 400ER series airplanes. This AD was prompted by reports of uncommanded autopilot engagement events resulting in incorrect stabilizer trim adjustment during takeoff. This AD requires, depending on the model/ configuration, installing an on-ground stabilizer autotrim inhibit system, relays and related wiring to open and close the flight control computer (FCC) analog output, and new operational program software (OPS) into the FCCs. We are issuing this AD to address the unsafe condition on these products.
For airplanes identified in paragraph (c)(1) of this AD: Within 24 months after the effective date of this AD, install new wiring and relays to reroute the four autotrim arm signals through new or existing air/ground determination source select switches, and do functional testing, in accordance with the Accomplishment Instructions of SASB 747-22-2256 R1. If the functional test fails, before further flight, do corrective actions, repeat the test, and do all applicable corrective actions until the functional test is passed, in accordance with the Accomplishment Instructions of SASB 747-22-2256 R1. Repeat the functional test of the automatic stabilizer trim system specified in step 250. of paragraph 3.B. of the Accomplishment Instructions of SASB 747-22-2256 R1, thereafter at intervals not to exceed 1,500 flight hours. If the functional test fails, before further flight, do corrective actions, repeat the test, and do all applicable corrective actions until the functional test is passed, in accordance with the Accomplishment Instructions of SASB 747-22-2256 R1.
For airplanes identified in paragraph (c)(2) of this AD: Within 24 months after the effective date of this AD, install wiring to inhibit the automatic stabilizer trim arm discrete when the airplane is on ground, install a two-position momentary contact test switch in the main equipment center, and do the functional test and all applicable corrective actions until the functional test is passed, in accordance with the Accomplishment Instructions of SASB 757-22-0096 R1. Repeat the functional test of the on-ground automatic stabilizer auto trim inhibit system and all applicable corrective actions specified in step 11. of paragraph 3.B. of the Accomplishment Instructions of SASB 757-22-0096 R1, thereafter at intervals not to exceed 1,500 flight hours. If the functional test fails, before further flight, do corrective actions, repeat the test, and do all applicable corrective actions until the functional test is passed, in accordance with the Accomplishment Instructions of SASB 757-22-0096 R1.
For airplanes identified in paragraph (c)(3) of this AD: Within 24 months after the effective date of this AD, install relays and wiring to open and close the flight control computer (FCC) analog output that controls the stabilizer trim adjustment, install a momentary action ground test switch, and do the functional testing and all applicable corrective actions, in accordance with the Accomplishment Instructions of SASB 767-22-0143 R2. Repeat the functional test of the on-ground automatic stabilizer auto trim inhibit system and all applicable corrective actions specified in steps 5.a. through 5.g. of Paragraph 3.B. of the Accomplishment Instructions of SASB 767-22-0143 R2, thereafter at intervals not to exceed 1,500 flight hours. If the functional test fails, before further flight, do corrective actions, repeat the test, and do all applicable corrective actions until the functional test is passed, in accordance with the Accomplishment Instructions of SASB 767-22-0143 R2.
(1) For airplanes identified in paragraph (c)(4) of this AD: Within 16 months after the effective date of this AD, install new operational program software into the FCCs, in accordance with the Accomplishment Instructions of SASB 767-22-0146 R1.
(2) For airplanes identified in paragraph (c)(5) of this AD: Within 16 months after the effective date of this AD, install new operational program software into the FCCs, in accordance with the Accomplishment Instructions of SB AP767-22-005 R1.
(1) This paragraph provides credit for actions required by paragraph (g) of this AD, if those actions were performed before the effective date of this AD using Boeing Special Attention Service Bulletin 747-22-2256, dated March 6, 2015.
(2) This paragraph provides credit for actions required by paragraph (h) of this AD, if those actions were performed before the effective date of this AD using Boeing Special Attention Service Bulletin 757-22-0096, dated March 23, 2015.
(3) This paragraph provides credit for actions required by paragraph (i) of this AD, if those actions were performed before the effective date of this AD using Boeing Special Attention Service Bulletin 767-22-0143, dated March 6, 2015; or Boeing Special Attention Service Bulletin 767-22-0143, Revision 1, dated July 6, 2015.
(4) This paragraph provides credit for actions required by paragraph (j) of this AD, if those actions were performed before the effective date of this AD using Boeing Special Attention Service Bulletin 767-22-0146, dated March 24, 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.
