- Model
- Fire 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.
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The airworthiness directive
52-23-01 EDISON FIRE DETECTORS: Applies to All Aircraft Equipped With Edison P/N 35534, Fire Detectors Installed in Junction Boxes.
To be accomplished not later than next engine change after January 1, 1953.
In order to prevent grounding of either or both terminals of Edison P/N 35534 fire detectors due to inadequate clearance between the detector terminals and the structure to which the junction box and detector assembly are mounted, or the junction box cover in some instances, the following corrective action must be accomplished.
The dimensions of the P/N 35534 Edison fire detector should be compared with the dimensions of the junction box employed by each operator to assure that there is sufficient clearance between the detector terminals and the structure to which it is mounted, or the cover. Sufficient clearance will depend on the construction of the junction box, but 3/16 of an inch may be used as a general guide. If such clearance does not exist an appropriate modification should be made, or appropriate insulation provided between the terminals and the structure or the junction box cover, as the case may be.
(Douglas General Service Letter DC-6 No. 115, dated January 29, 1952, covers this same subject.)