AD 59-24-02
final rule
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 |
| appliance | 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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Federal Register Abstract
Smoke Detectors
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_59-24-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 59-24-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; KIDDE and C-O-TWO: Applies to Smoke Detectors, Kidde Model A4532-M1, and...Show more Subject: Smoke Detectors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: C-O-Two | Walter Kidde Model: Smoke Detectors Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 59-24-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 59-24-02 SUBJECT HEADING: 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 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 59-24-02 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. The Walter Kidde Model A4532-M1 and the C-O-TWO Models ASDC-2 and ASDT-3 smoke detectors have unstable and over-sensitive alarm settings; thus resulting in false indications. Due to this unsatisfactory characteristic, the manufacturers, Walter Kidde and Company and the C-O-TWO Division of Fyr-Fyter Company have withdrawn their statements of conformance with Technical Standard Orders, TSO-C1 and C1a for these smoke detectors. Therefore, their TSO approvals are invalidated. All Models A4532-M1, ASDC-2 and ASDT-3 smoke detectors installed in transport category aircraft shall be removed from service prior to January 31, 1960, except when these models are approved as a part of the airplane installation under a supplemental type certificate. The TSO identification shall be eliminated from the detector label of such detectors approved as a part of the airplane installation. FOOTER:
Document Text
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AD Final Rules - DRS_59-24-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 59-24-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; KIDDE and C-O-TWO: Applies to Smoke Detectors, Kidde Model A4532-M1, and...Show more Subject: Smoke Detectors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: C-O-Two | Walter Kidde Model: Smoke Detectors Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 59-24-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 59-24-02 SUBJECT HEADING: 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 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 59-24-02 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. The Walter Kidde Model A4532-M1 and the C-O-TWO Models ASDC-2 and ASDT-3 smoke detectors have unstable and over-sensitive alarm settings; thus resulting in false indications. Due to this unsatisfactory characteristic, the manufacturers, Walter Kidde and Company and the C-O-TWO Division of Fyr-Fyter Company have withdrawn their statements of conformance with Technical Standard Orders, TSO-C1 and C1a for these smoke detectors. Therefore, their TSO approvals are invalidated. All Models A4532-M1, ASDC-2 and ASDT-3 smoke detectors installed in transport category aircraft shall be removed from service prior to January 31, 1960, except when these models are approved as a part of the airplane installation under a supplemental type certificate. The TSO identification shall be eliminated from the detector label of such detectors approved as a part of the airplane installation. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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