AD 2015-21-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Loss of cabin altitude warning, which could delay flightcrew recognition of a lack of cabin pressurization, and could result in incapacitation of the flightcrew due to hypoxia, and consequent loss of control of the airplane.
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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 certain wire bundles or connect certain previously capped and stowed wires as necessary. For certain airplanes, also modify the instrument panels, install light assemblies, modify the wire bundles, and install a new circuit breaker as necessary.
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Compliance Time
Within the compliance times specified in AD 2015-16-01, Amendment 39-18226.
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Affected Aircraft
The Boeing Company Model 737 airplanes, as specified in AD 2015-16-01, Amendment 39-18226.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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