AD 52-23-01
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Edison | Fire Detectors | Airworthiness Directives; EDISON FIRE DETECTORS: Applies to All Aircraft Equipped With Edison P/N 35534, Fire Detectors Installed in Junction Boxes |
| appliance | Edison | Fire Detectors | Airworthiness Directives; EDISON FIRE DETECTORS: Applies to All Aircraft Equipped With Edison P/N 35534, Fire Detectors Installed in Junction Boxes |
Unsafe Condition
Grounding of either or both terminals of Edison P/N 35534 fire detectors due to inadequate clearance between the detector terminals and the structure or junction box cover.
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Required Actions
Compare dimensions of P/N 35534 fire detector with junction box to ensure sufficient clearance (minimum 3/16 inch) between terminals and structure/cover. Modify or provide insulation if clearance is insufficient.
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Compliance Time
not later than next engine change after January 1, 1953
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Affected Aircraft
All aircraft equipped with Edison P/N 35534 fire detectors installed in junction boxes.
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Federal Register Abstract
Fire Detectors
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_52-23-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-23-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; EDISON FIRE DETECTORS: Applies to All Aircraft Equipped With Edison P/N ...Show more Subject: Fire Detectors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Edison Model: Fire Detectors Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 52-23-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-23-01 SUBJECT HEADING: Airworthiness Directives; EDISON FIRE DETECTORS: Applies to All Aircraft Equipped With Edison P/N 35534, Fire Detectors Installed in Junction Boxes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_52-23-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-23-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; EDISON FIRE DETECTORS: Applies to All Aircraft Equipped With Edison P/N ...Show more Subject: Fire Detectors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Edison Model: Fire 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: 52-23-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-23-01 SUBJECT HEADING: Airworthiness Directives; EDISON FIRE DETECTORS: Applies to All Aircraft Equipped With Edison P/N 35534, Fire Detectors Installed in Junction Boxes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 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.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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