Airworthiness directives › 2018-22-04
AD 2018-22-04 Airworthiness Directives; The Boeing Company Airplanes
Models named: 787 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company Model 787 series airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For The Boeing Company Model 787-8 and 787-9 airplanes identified in Boeing Alert Service Bulletin B787-81205-SB270032-00, Issue 001, dated November 3, 2015: Within 60 months after February 21, 2017 (the effective date of AD 2017-01-02), do an inspection of the inboard and outboard trailing edge flap rotary actuator for any discrepant rotary actuator, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin B787-81205-SB270032-00, Issue 001, dated November 3, 2015; or Boeing Alert Service Bulletin B787-81205-SB270032-00, Issue 003, dated July 28, 2017. If any discrepant rotary actuator is found, within 60 months after February 21, 2017, do the actions specified in paragraph (g)(1) or (g)(2) of this AD, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin B787-81205-SB270032-00, Issue 001, dated November 3, 2015; or Boeing Alert Service Bulletin B787-81205-SB270032-00, Issue 003, dated July 28, 2017. After the effective date of this AD only Boeing Alert Service Bulletin B787-81205-SB270032-00, Issue 003, dated July 28, 2017, may be used. (1) Replace the discrepant rotary actuator. (2) Check the maintenance records to determine the flight cycles of each discrepant rotary actuator and, within 60 months after February 21, 2017 (the effective date of AD 2017-01-02), do all applicable related investigative and corrective actions.
Unsafe condition
This AD was prompted by a report indicating that some inboard and outboard trailing edge flap rotary actuators may have been assembled with an incorrect no-back brake rotor-stator stack sequence during manufacturing. We are issuing this AD to detect and replace incorrectly assembled rotary actuators, which could cause accelerated unit wear that will eventually reduce braking performance. This degradation could lead to loss of no-back brake function and reduced controllability of the airplane.
Affected ADs
This AD replaces AD 2017-01-02, Amendment 39-18769 (82 FR 4775, January 17, 2017) (“AD 2017-01-02”).
Read the original on the Federal Register →
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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