AD 71-11-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-360-A1A | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1B | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1B6 | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1C | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1D6 | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2A | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2B | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2C | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1A | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1B | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1C | AVCO LYCOMING Model IO-360A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1D6 | AVCO LYCOMING Model IO-360A and -C Series Engines |
Unsafe Condition
Valve failures due to the intake and exhaust hydraulic tappet plunger assembly P/N 76290.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the intake and exhaust hydraulic tappet plunger assembly P/N 76290 with P/N 78290 within the specified in-service time limits.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
(a) Engines with less than 400 hours in service on P/N 76290 as of the effective date must comply prior to accumulating 450 hours in service. (b) Engines with 400 or more hours in service on P/N 76290 as of the effective date must comply within the next 50 hours in service.
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Affected Aircraft
AVCO Lycoming Model IO-360A and -C Series engines with serial numbers 1734-51A through 4412-51A and those remanufactured between 1 September 1965 and 11 October 1967.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Intake and Exhaust Hydraulic Tappet Plunger Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_71-11-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-11-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: AVCO LYCOMING Model IO-360A and -C Series Engines Subject: Intake and Exhaust Hydraulic Tappet Plunger Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/14/1972 Make: Lycoming Engines Model: IO-360-A1A | IO-360-A1B | IO-360-A1B6 | IO-360-A1C | IO-360-A1D6 | IO-360-A2A | IO-360-A2B | IO-360-...Show more 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: 71-11-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1403 AD NUMBER: 71-11-02 SUBJECT HEADING: AVCO LYCOMING Model IO-360A and -C Series Engines ACTION: SUMMARY: DATES: Effective March 14, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-11-02 AVCO LYCOMING: Amdt. 39-1208 as amended by Amendment 39-1403. Applies to all IO- 360A and -C Series engines with serial numbers 1734-51A through 4412-51A and all such series engines remanufactured between 1 September 1965 and 11 October 1967. Compliance required as indicated, unless already accomplished. To prevent valve failures replace the intake and exhaust hydraulic tappet plunger assembly P/N 76290 with P/N 78290 at the time in service specified below: (a) Engines with less than 400 hours in service on P/N 76290 as of the effective date of this AD, shall comply prior to the accumulation of 450 hours in service. (b) Engines with 400 or more hours in service on P/N 76290 as of the effective date of this AD shall comply within the next 50 hours in service. (Note: Lycoming Service Bulletin No. 328 covers this subject.) Amendment 39-1208 was effective May 19, 1971. This Amendment 39-1403 is effective March 14, 1972. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_71-11-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-11-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: AVCO LYCOMING Model IO-360A and -C Series Engines Subject: Intake and Exhaust Hydraulic Tappet Plunger Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/14/1972 Make: Lycoming Engines Model: IO-360-A1A | IO-360-A1B | IO-360-A1B6 | IO-360-A1C | IO-360-A1D6 | IO-360-A2A | IO-360-A2B | IO-360-...Show more 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: 71-11-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1403 AD NUMBER: 71-11-02 SUBJECT HEADING: AVCO LYCOMING Model IO-360A and -C Series Engines ACTION: SUMMARY: DATES: Effective March 14, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-11-02 AVCO LYCOMING: Amdt. 39-1208 as amended by Amendment 39-1403. Applies to all IO- 360A and -C Series engines with serial numbers 1734-51A through 4412-51A and all such series engines remanufactured between 1 September 1965 and 11 October 1967. Compliance required as indicated, unless already accomplished. To prevent valve failures replace the intake and exhaust hydraulic tappet plunger assembly P/N 76290 with P/N 78290 at the time in service specified below: (a) Engines with less than 400 hours in service on P/N 76290 as of the effective date of this AD, shall comply prior to the accumulation of 450 hours in service. (b) Engines with 400 or more hours in service on P/N 76290 as of the effective date of this AD shall comply within the next 50 hours in service. (Note: Lycoming Service Bulletin No. 328 covers this subject.) Amendment 39-1208 was effective May 19, 1971. This Amendment 39-1403 is effective March 14, 1972. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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