AD 80-14-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | LO-360-E1A6D | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H1AD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H1BD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H2AD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H2BD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H3AD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
| engine | Lycoming Engines | O-320-H3BD | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
| engine | Lycoming Engines | O-360-E1A6D | AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines |
Unsafe Condition
Failure of valves due to installation of improperly hardened upper exhaust valve spring seats.
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Required Actions
Within 25 hours in service after the effective date, inspect all upper exhaust valve spring seats for part number LW-16475 with 'KLI' letters in a curved pattern as per Service Bulletin No. 447. Replace seats without 'KLI' markings with compliant ones per AVCO Lycoming S/B No. 435 or Overhaul Manual P/N 60294-9.
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Compliance Time
Within the next 25 hours in service after the effective date of this AD
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Affected Aircraft
AVCO Lycoming Model O-320-H series engines S/N L-101-76 thru L-7608-76; O-360-E series S/N L-101-77 thru L-455-77; LO-360-E series S/N L-101-72 thru L-451-72; all remanufactured engines of these models shipped before November 16, 1979.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Upper Exhaust Valve Spring Seats
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_80-14-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 80-14-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines Subject: Upper Exhaust Valve Spring Seats Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/07/1980 Make: Lycoming Engines Model: LO-360-E1A6D | O-320-H1AD | O-320-H1BD | O-320-H2AD | O-320-H2BD | O-320-H3AD | O-320-H3BD | O-360-E1A6D Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 80-14-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3826 AD NUMBER: 80-14-07 SUBJECT HEADING: AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines ACTION: SUMMARY: DATES: Effective July 7, 1980. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 80-14-07 AVCO LYCOMING: Amendment 39-3826. Applies to O-320-H series engines, S/Ns L-101-76 thru L-7608-76, O-360-E series engines, S/Ns L-101-77 thru L-455-77; LO-360-E series engines, S/Ns L-101-72 thru L-451-72 and all remanufactured engines of these models shipped prior to November 16, 1979. Compliance required as indicated, unless already accomplished. To prevent failure of valves due to installation of improperly hardened upper exhaust valve spring seats, accomplish the following: Within the next 25 hours in service after the effective date of this AD remove the valve rocker box covers and visually inspect all upper exhaust valve spring seats for part number identification. (a) If all four upper exhaust valve spring seats are identified as Part Number LW-16475 followed by the letters "KLI", in a curved pattern as shown in Lycoming Service Bulletin No. 447, the engine may be returned to service. (b) If any of the upper exhaust valve spring seats are identified as Part Number LW-16475 without the letters "KLI", they must be removed and replaced with seats marked as described in paragraph (a) above. Installation of these valve spring seats shall be accomplished per instructions in AVCO Lycoming S/B No. 435 or Lycoming Overhaul Manual P/N 60294-9 or an approved alternate. Compliance with paragraph (a) of AD 80-04-03 or AVCO Lycoming S/B 447 dated January 11, 1980, will constitute compliance with the requirements of this AD. Equivalent methods of compliance may be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration (FAA) Eastern Region. Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region may adjust the compliance time specified in this AD. This amendment is effective July 7, 1980. FOOTER:
Document Text
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AD Final Rules - DRS_80-14-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 80-14-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines Subject: Upper Exhaust Valve Spring Seats Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/07/1980 Make: Lycoming Engines Model: LO-360-E1A6D | O-320-H1AD | O-320-H1BD | O-320-H2AD | O-320-H2BD | O-320-H3AD | O-320-H3BD | O-360-E1A6D Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 80-14-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3826 AD NUMBER: 80-14-07 SUBJECT HEADING: AVCO LYCOMING Model O-320-H, O-360-E, LO-360-E Series Engines ACTION: SUMMARY: DATES: Effective July 7, 1980. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 80-14-07 AVCO LYCOMING: Amendment 39-3826. Applies to O-320-H series engines, S/Ns L-101-76 thru L-7608-76, O-360-E series engines, S/Ns L-101-77 thru L-455-77; LO-360-E series engines, S/Ns L-101-72 thru L-451-72 and all remanufactured engines of these models shipped prior to November 16, 1979. Compliance required as indicated, unless already accomplished. To prevent failure of valves due to installation of improperly hardened upper exhaust valve spring seats, accomplish the following: Within the next 25 hours in service after the effective date of this AD remove the valve rocker box covers and visually inspect all upper exhaust valve spring seats for part number identification. (a) If all four upper exhaust valve spring seats are identified as Part Number LW-16475 followed by the letters "KLI", in a curved pattern as shown in Lycoming Service Bulletin No. 447, the engine may be returned to service. (b) If any of the upper exhaust valve spring seats are identified as Part Number LW-16475 without the letters "KLI", they must be removed and replaced with seats marked as described in paragraph (a) above. Installation of these valve spring seats shall be accomplished per instructions in AVCO Lycoming S/B No. 435 or Lycoming Overhaul Manual P/N 60294-9 or an approved alternate. Compliance with paragraph (a) of AD 80-04-03 or AVCO Lycoming S/B 447 dated January 11, 1980, will constitute compliance with the requirements of this AD. Equivalent methods of compliance may be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration (FAA) Eastern Region. Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region may adjust the compliance time specified in this AD. This amendment is effective July 7, 1980. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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