Airworthiness directives › 2020-24-02
AD 2020-24-02 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-8, 737-9. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 737-8 and 737-9 airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 737-31-1860, Revision 1, dated July 2, 2020.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Before further flight, install FCC OPS software version P12.1.2, part number (P/N) 2274-COL-AC2-26, or later-approved software versions, on FCC A and FCC B, and do a software installation verification. During the installation verification, if the approved software part number is not shown as being installed on FCC A and FCC B, before further flight, do corrective actions until the approved software part number is installed on FCC A and FCC B. Later-approved software versions are only those Boeing software versions that are approved as a replacement for the applicable software, and are approved as part of the type design by the FAA after the effective date of this AD. Accomplishment of all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737-22A1342 RB, dated November 17, 2020, is acceptable for compliance with the requirements of this paragraph. Note 1 to paragraph (g): Guidance for doing the installation and installation verification of the FCC OPS software can be found in Boeing 737-7/8/8200/9/10 Aircraft Maintenance Manual (AMM), Section 22-11-33. Note 2 to paragraph (g): Guidance for accomplishing the actions required by paragraph (g) can also be found in Boeing Alert Service Bulletin 737-22A1342, dated November 17, 2020, which is referred to in Boeing Alert Requirements Bulletin 737-22A1342 RB, dated November 17, 2020.
Unsafe condition
This AD was prompted by the potential for a single erroneously high angle of attack (AOA) sensor input received by the flight control system to result in repeated airplane nose-down trim of the horizontal stabilizer, which, in combination with multiple flight deck effects, could affect the flightcrew's ability to accomplish continued safe flight and landing.
Affected ADs
This AD replaces AD 2018-23-51, Amendment 39-19512 (83 FR 62697, December 6, 2018; corrected December 11, 2018 (83 FR 63561)) (“AD 2018-23-51”).
Read the original on the Federal Register →
You just looked this one up by hand
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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