- Models
- Smoke Detectors, Smoke Detectors
- Product
- Appliance
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | 72f70801…b2462de | FAA DRS (API key needed) |
On this page
The airworthiness directive
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characteristic, the manufacturers, Walter Kidde and Company and the C-O-TWO Division of Fyr-Fyter Company have withdrawn their statements of conformance with Technical Standard Orders, TSO-C1 and C1a for these smoke detectors.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.