AD 2012-19-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Lack of cabin pressurization event without receiving an aural warning, which could delay flightcrew recognition and lead to incapacitation due to hypoxia.
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Required Actions
Install a redundant cabin altitude pressure switch, replace the aural warning module (AWM) with a new or reworked AWM, change wire bundles, and connect previously capped and stowed wires as necessary. For certain airplanes, also modify instrument panels, install light assemblies, modify wire bundles, and install a new circuit breaker as necessary.
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Compliance Time
Within 72 months of the effective date (November 7, 2012).
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Affected Aircraft
The Boeing Company Model 737 airplanes, as specified in the referenced service information.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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