Airworthiness Directive · Amendment 39-18922 · Air conditioning
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2020-01-11. Comply with the one in force.
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.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-800, -900, and -900ER series airplanes. This AD was prompted by reports of in-flight failure of the left temperature control valve and control cabin trim air modulating valve. This AD requires replacing the left temperature control valve and control cabin trim air modulating valve. We are issuing this AD to address the unsafe condition on these products.
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.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
