Airworthiness directives › 2023-13-09
AD 2023-13-09 Airworthiness Directives; The Boeing Company Airplanes
Models named: 767-200, -300, -300F, -400ER, -2C 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 767-200, -300, -300F, -400ER, and -2C series airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For all Model 767-200, -300, -300F, and -400ER airplanes: Except as specified by paragraph (h) of this AD, at the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 767-27A0240 RB, dated January 19, 2021, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 767-27A0240 RB, dated January 19, 2021. Note 1 to paragraph (g)(1): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 767-27A0240, dated January 19, 2021, which is referred to in Boeing Alert Requirements Bulletin 767-27A0240 RB, dated January 19, 2021. (2) For Model 767-200, -300, -300F, and -400ER airplanes, as identified in Boeing Alert Requirements Bulletin 767-27A0243 RB, dated May 28, 2021: Except as specified by paragraph (h) of this AD, at the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 767-27A0243 RB, dated May 28, 2021, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 767-27A0243 RB, dated May 28, 2021. Accomplishing the installation of two new drain holes required by this paragraph terminates the repetitive inspections of the drain holes required by paragraph (g)(1) of this AD. Note 2 to paragraph (g)(2): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 767-27A0243, dated May 28, 2021, which is referred to in Boeing Alert Requirements Bulletin 767-27A0243 RB, dated May 28, 2021. (3) For Model 767-2C airplanes: Within 90 days after the effective date of this AD, inspect the LSPTMs, LSPTM electrical wiring, drain holes, and leveling compound; install two new drain holes as applicable; and do applicable on-condition actions in accordance with a method approved by the Manager, AIR-520 Continued Operational Safety Branch, FAA.
Unsafe condition
This AD was prompted by reports of inoperative manual and alternate horizontal stabilizer trim switches; an investigation found that certain drain holes were blocked, causing water and ice to collect and subsequently cover the limit switch and position transmitter modules (LSPTMs), which affected their function. The FAA is issuing this AD to address collected water or ice that could damage the LSPTMs and cause stabilizer trim position sensors to generate corrupt or erroneous signals to the flight crew. This condition, if not addressed, could result in misleading or confusing flight deck indications, a high speed overrun during takeoff, or a low altitude stall immediately after takeoff.
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