AD 93-13-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | ATP | Airworthiness Directives; British Aerospace (Commercial Aircraft), Limited Model ATP Series Airplanes |
Unsafe Condition
Operational failure of the fire extinguisher systems for the left- and right-hand engines due to out-of-tolerance electrical resistance readings in the firing circuits at the cartridge connectors.
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Required Actions
Within 14 days after the effective date, perform a safety ohmmeter inspection of the fire extinguisher systems' firing circuits. If an out-of-tolerance condition (resistance <5.5 ohms or >7 ohms) is detected, conduct a full electrical inspection, re-inspect, and if unresolved, replace the cartridge firing unit or connector. Submit findings to Jetstream Aircraft, Ltd. within 10 days after inspections.
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Compliance Time
Within 14 days after the effective date of this AD
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Affected Aircraft
British Aerospace (Commercial Aircraft), Limited Model ATP series airplanes, serial numbers 2001 through 2055, inclusive, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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