AD 59-24-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | C-O-Two | Walter Kidde | Smoke Detectors | Airworthiness Directives; KIDDE and C-O-TWO: Applies to Smoke Detectors, Kidde Model A4532-M1, and C-O-TWO Models ASDC-2 and ASDT-3, Installed in Civil Transport Category Aircraft |
Unsafe Condition
Smoke detectors Kidde Model A4532-M1 and C-O-TWO Models ASDC-2 and ASDT-3 have unstable and over-sensitive alarm settings resulting in false indications.
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Required Actions
Remove all models A4532-M1, ASDC-2, and ASDT-3 smoke detectors from service except those approved under a supplemental type certificate. Eliminate TSO identification from detector labels of approved detectors.
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Compliance Time
prior to January 31, 1960
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Affected Aircraft
Walter Kidde and C-O-TWO Division of Fyr-Fyter Company smoke detectors: Kidde Model A4532-M1, C-O-TWO Models ASDC-2 and ASDT-3 installed in civil transport category aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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