AD Amdt-39-9430
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737 | Airworthiness Directives; Boeing Model 737 Series Airplanes |
Unsafe Condition
A latent electrical failure in the APU fire extinguishing system could prevent APU shutdown and fire extinguishant discharge when the fire handle is pulled and rotated.
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Required Actions
Revise the Airplane Flight Manual (AFM) Emergency Procedures Section to include additional procedures for shutting down the APU during an indicated fire. Remove the requirement to include these procedures in the Limitations Section of the AFM.
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Compliance Time
Before further flight
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Affected Aircraft
All Boeing Model 737 series airplanes worldwide.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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