Airworthiness directives › 2025-21-02
AD 2025-21-02 Airworthiness Directives; The Boeing Company Airplanes
Models named: 777-200, -200LR, -300, -300ER, 777F 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 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before the effective date of this AD: This paragraph restates the requirements of paragraph (g) of AD 2022-15-06, with revised affected airplanes. At the later of the times specified in paragraphs (g)(1) and (2) of this AD: Disconnect the connectors and cap and stow the wires to bundles/connectors W7314/D02006P and W7579/D02005P from the transorb module part numbers CLPT-12SP-06, CLPT-12SP-07, and CLPT-12SP-67. Note 1 to the introductory text of paragraph (g): Guidance on locating wire bundles/connectors W7314/D02006P and W7579/D02005P can be found in Section 05-55-43 of the Boeing 777 aircraft maintenance manual. Note 2 to the introductory text of paragraph (g): Guidance on capping and stowing the wires once they are disconnected can be found in Section 20-10-11 of the Boeing Standard Wiring Practices Manual. (1) Before the accumulation of 75,000 total flight hours or 23,000 total flight cycles, whichever occurs first. (2) Within 3 months after August 18, 2022 (the effective date of AD 2022-15-06).
Unsafe condition
This AD was prompted by high electrical resistance within the gust suppression sensor (GSS) transorb modules due to corrosion on the transorb threads and insufficient engagement of the anti-rotation teeth. The FAA is issuing this AD to address high electrical resistance in both transorb modules, which can result in two actuator control electronics (ACEs) being exposed to damaging lightning transient voltages in excess of the qualification levels, potentially inducing erroneous or oscillatory outputs to flight control surfaces. The unsafe condition, if not addressed, could result in loss of control of the airplane.
Affected ADs
This AD replaces AD 2022-15-06, Amendment 39-22126 (87 FR 47334, August 3, 2022) (AD 2022-15-06).
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