Airworthiness directives › 2021-08-14
AD 2021-08-14 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-300, -400, -500 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 737-300, -400, and -500 series airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 250 flight hours or 2 months after the effective date of this AD, whichever occurs first: Perform the applicable A/T computer BITE (built-in test equipment) test, “A/T BITE TEST LRU INTERFACE,” and before further flight do all applicable corrective actions, in accordance with paragraphs 1. through 5. of Boeing Multi-Operator Message MOM-MOM-21-0145-01B(R2), dated March 30, 2021, except as provided in paragraph (h) of this AD. Repeat the test thereafter at intervals not to exceed 2,000 flight hours.
Unsafe condition
This AD was prompted by a flap synchro wire failure that may go undetected by the autothrottle (A/T) computer. The FAA is issuing this AD to address failure of the flap position sensor, which could result in failure of the asymmetric cruise thrust monitor to engage during a large thrust asymmetry event, and loss of control of the airplane.
Affected ADs
None.
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