AD 2017-12-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
In-flight failure of the left temperature control valve and control cabin trim air modulating valve.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the left temperature control valve and control cabin trim air modulating valve in accordance with Boeing Alert Service Bulletin 737-21A1203, dated June 8, 2016.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 12 months of the effective date (July 20, 2017).
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Affected Aircraft
The Boeing Company Model 737-800, -900, and -900ER series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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