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 |
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.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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