AD 2009-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-300 | Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes |
Unsafe Condition
Loss of both the normal electronic flight instrument system (EFIS) cooling supply and the indication of EFIS cooling loss due to a single failure of the battery bus, causing eventual power-down of the EFIS displays.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the control power wiring of the normal supply fan and the low flow sensor for the equipment cooling system of the electronic flight instrument system (EFIS).
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Compliance Time
Within a specified time frame (not explicitly stated in the provided text).
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Affected Aircraft
Boeing Model 737-300, -400, and -500 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-21A1156, Revision 2, dated December 11, 2008.
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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