AD 60-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | GO-480-C1B6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-C1D6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-C2C6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-C2D6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-C2E6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-C3A6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-G1A6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-G1B6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-G1D6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GO-480-G2D6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GSO-480-A1A6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GSO-480-A1C6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GSO-480-B1A6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GSO-480-B1B6 (O-480-1) | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GSO-480-B1C6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
| engine | Lycoming Engines | GSO-480-B2D6 | LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines |
Unsafe Condition
Excessive crankshaft counterweight bushing wear and subsequent detuning of the counterweights.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify crankshafts with cast counterweights to incorporate forged counterweights with hardened steel counterweight bushings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at first engine overhaul after July 1, 1960
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lycoming Engines models GO-480-C, -G and All GSO-480 Series Engines
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Crankshaft
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_60-11-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-11-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines Subject: Crankshaft Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lycoming Engines Model: GO-480-C1B6 | GO-480-C1D6 | GO-480-C2C6 | GO-480-C2D6 | GO-480-C2E6 | GO-480-C3A6 | GO-480-G1A6 | GO...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: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-11-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-11-06 SUBJECT HEADING: LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-11-06 LYCOMING: Amdt. 162 Part 507 Federal Register May 27, 1960. Applies to GO-480-C, -G and All GSO-480 Series Engines. Compliance required at first engine overhaul after July 1, 1960. To prevent excessive crankshaft counterweight bushing wear and subsequent detuning of the counterweights, crankshafts with cast counterweights must be modified to incorporate forged counterweights with hardened steel counterweight bushings. (Lycoming Service Bulletin No. 249A covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_60-11-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 60-11-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines Subject: Crankshaft Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lycoming Engines Model: GO-480-C1B6 | GO-480-C1D6 | GO-480-C2C6 | GO-480-C2D6 | GO-480-C2E6 | GO-480-C3A6 | GO-480-G1A6 | GO...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: AIRWORTHINESS DIRECTIVES FINAL RULES: 60-11-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 60-11-06 SUBJECT HEADING: LYCOMING Model GO-480-C, -G and All GSO-480 Series Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 60-11-06 LYCOMING: Amdt. 162 Part 507 Federal Register May 27, 1960. Applies to GO-480-C, -G and All GSO-480 Series Engines. Compliance required at first engine overhaul after July 1, 1960. To prevent excessive crankshaft counterweight bushing wear and subsequent detuning of the counterweights, crankshafts with cast counterweights must be modified to incorporate forged counterweights with hardened steel counterweight bushings. (Lycoming Service Bulletin No. 249A covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2012-03-07
final ruleAirworthiness Directives; Lycoming Engines Reciprocating Engines
Unsafe Condition: A 'machined-from-billet' HA-6 carburetor having a loose mixture control sleeve that rotated in the carburetor body causing restriction of fuel and power loss.
2004-10-14
final ruleAirworthiness Directives; Lycoming Engines (Formerly Textron Lycoming), Direct-Drive Reciprocating Engines; Correction
Unsafe Condition: This document makes corrections to Airworthiness Directive (AD) 2004-10-14, applicable to Lycoming Engines (formerly Textron Lycoming), direct-drive reciprocating engines that was published in the ...
2003-14-03
final ruleAirworthiness Directives; Textron Lycoming Fuel Injected Reciprocating Engines
Unsafe Condition: Rotary fuel pump leaks, which could result in an engine failure, engine fire, and damage to or loss of the aircraft.
97-15-11
final ruleAirworthiness Directives; Avco Lycoming and Textron Lycoming Reciprocating Engines
Unsafe Condition: Piston pin failure, which could result in engine failure, due to defective piston pins not meeting manufacturing specifications.