Airworthiness directives › 2017-12-07
AD 2017-12-07 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-800, -900, -900ER series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to The Boeing Company Model 737-800, -900, and -900ER series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-21A1203, dated June 8, 2016.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 60 months after the effective date of this AD, replace the left temperature control valve and control cabin trim air modulating valve, as applicable, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-21A1203, dated June 8, 2016.
Unsafe condition
This AD was prompted by reports of in-flight failure of the left temperature control valve and control cabin trim air modulating valve. We are issuing this AD to prevent temperatures in excess of 100 degrees Fahrenheit in the flight deck or the passenger cabin during cruise, which could lead to the impairment of the flight crew and prevent continued safe flight and landing.
Affected ADs
None.
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