AD 74-18-15
EMERGENCY AD
emergency
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Leigh Systems | Emergency Locator Transmitter | Airworthiness Directives; LEIGH SYSTEMS: Emergency Locator Transmitter Leigh Systems Sharc 7 Series. Applies to Leigh Systems Sharc 7 Series Serial Nos. 1000-24000 Emergency Locator Transmitter |
| appliance | Leigh Systems | Emergency Locator Transmitter | Airworthiness Directives; LEIGH SYSTEMS: Emergency Locator Transmitter Leigh Systems Sharc 7 Series. Applies to Leigh Systems Sharc 7 Series Serial Nos. 1000-24000 Emergency Locator Transmitter |
Unsafe Condition
Magnesium battery gassing and the possibility of lightning strike or static electricity buildup igniting the mixture resulting in rupture and activation of the Emergency Locator Transmitter.
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Required Actions
Disconnect the ELT antenna at the ELT electronic unit and install Leigh Systems Part No. 04 05 002 Static Electricity Suppresser in the coaxial line between the antenna and the electronic unit. Aircraft may be flown to a base for maintenance under FAR 91.52(e)(2).
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Compliance Time
within the next 90 days after the effective date of this A.D.
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Affected Aircraft
Leigh Systems Sharc 7 Series Emergency Locator Transmitter, Serial Nos. 1000-24000.
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Federal Register Abstract
Emergency Locator Transmitter
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-18-15.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-15 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LEIGH SYSTEMS: Emergency Locator Transmitter Leigh Systems Sharc 7 Serie...Show more Subject: Emergency Locator Transmitter Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/23/1975 Make: Leigh Systems Model: Emergency Locator Transmitter Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-18-15 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2068 AD NUMBER: 74-18-15 SUBJECT HEADING: Airworthiness Directives; LEIGH SYSTEMS: Emergency Locator Transmitter Leigh Systems Sharc 7 Series. Applies to Leigh Systems Sharc 7 Series Serial Nos. 1000-24000 Emergency Locator Transmitter ACTION: SUMMARY: DATES: Effective January 23, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-15 LEIGH SYSTEMS: Amendment 39-1942 as amended by Amendment 39-2068. Emergency Locator Transmitter Leigh Systems Sharc 7 Series. Applies to Leigh Systems Sharc 7 Series Serial Nos. 1000-24000 Emergency Locator Transmitter. Compliance required as indicated: As a result of magnesium battery gassing and the possibility of lightning strike or static electricity buildup igniting the mixture resulting in the rupture and activation of the Emergency Locator Transmitter accomplish the following: (a) Unless already accomplished, within the next 90 days after the effective date of this A.D. disconnect the ELT antenna at the ELT electronic unit. Install Leigh Systems Part No. 04 05 002 Static Electricity Suppresser in the coaxial line between the antenna and the electronic unit. Units equipped with magnesium batteries may be determined by weight shown on unit identification tag as 2.3 pounds. (b) Aircraft may be flown to a base where the maintenance required by this A.D. may be performed as permitted by FAR 91.52(e)(2). (c) Upon request with substantiating data submitted through an FAA inspector the compliance time specified in this A.D. may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Amendment 39-1942 was effective September 3, 1974. This amendment 39-2068 is effective January 23, 1975. FOOTER:
Document Text
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AD Final Rules - DRS_74-18-15.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-15 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LEIGH SYSTEMS: Emergency Locator Transmitter Leigh Systems Sharc 7 Serie...Show more Subject: Emergency Locator Transmitter Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/23/1975 Make: Leigh Systems Model: Emergency Locator Transmitter 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: 74-18-15 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2068 AD NUMBER: 74-18-15 SUBJECT HEADING: Airworthiness Directives; LEIGH SYSTEMS: Emergency Locator Transmitter Leigh Systems Sharc 7 Series. Applies to Leigh Systems Sharc 7 Series Serial Nos. 1000-24000 Emergency Locator Transmitter ACTION: SUMMARY: DATES: Effective January 23, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-15 LEIGH SYSTEMS: Amendment 39-1942 as amended by Amendment 39-2068. Emergency Locator Transmitter Leigh Systems Sharc 7 Series. Applies to Leigh Systems Sharc 7 Series Serial Nos. 1000-24000 Emergency Locator Transmitter. Compliance required as indicated: As a result of magnesium battery gassing and the possibility of lightning strike or static electricity buildup igniting the mixture resulting in the rupture and activation of the Emergency Locator Transmitter accomplish the following: (a) Unless already accomplished, within the next 90 days after the effective date of this A.D. disconnect the ELT antenna at the ELT electronic unit. Install Leigh Systems Part No. 04 05 002 Static Electricity Suppresser in the coaxial line between the antenna and the electronic unit. Units equipped with magnesium batteries may be determined by weight shown on unit identification tag as 2.3 pounds. (b) Aircraft may be flown to a base where the maintenance required by this A.D. may be performed as permitted by FAR 91.52(e)(2). (c) Upon request with substantiating data submitted through an FAA inspector the compliance time specified in this A.D. may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Amendment 39-1942 was effective September 3, 1974. This amendment 39-2068 is effective January 23, 1975. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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