Airworthiness directives › 2016-25-01
AD 2016-25-01 Airworthiness Directives; The Boeing Company Airplanes
Models named: 747-400, 747-400D, 747-400F series, 757-200, -200PF, -200CB, -300 series, 767-200, -300, -300F. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD was prompted by reports of uncommanded autopilot engagement events resulting in incorrect stabilizer trim adjustment during takeoff. We are issuing this AD to prevent stabilizer mistrim, which could result in a high-speed rejected takeoff and runway overrun, or reduced controllability of the airplane after takeoff due to insufficient pitch control.
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