# AD 60-11-06: Crankshaft

- Type: Airworthiness directive
- Status: Current
- Products: Lycoming Engines GO-480-C1B6, GO-480-C1D6, GO-480-C2C6, GO-480-C2D6, GO-480-C2E6, GO-480-C3A6, GO-480-G1A6, GO-480-G1B6, GO-480-G1D6, GO-480-G2D6, GSO-480-A1A6, GSO-480-A1C6 and 4 more
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Registered aircraft: 318 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D63399142BF5B48A862569B2006D2FEE.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/60-11-06

## The airworthiness directive

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.)

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-275](https://openairdocs.org/tcds/E-275): Lycoming Engines; names 10 of 33 models: GO-480-C1B6, GO-480-C2C6, GO-480-C3A6, GO-480-C2E6, GO-480-C2D6, GO-480-G1A6, GO-480-G1B6, GO-480-G2D6…
- [TCDS E-284](https://openairdocs.org/tcds/E-284): Lycoming Engines; names 6 of 23 models: GSO-480-B1C6, GSO-480-A1C6, GSO-480-B1B6 (O-480-1), GSO-480-A1A6, GSO-480-B2D6, GSO-480-B1A6

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 318 (0 by airframe model, 318 by engine model)
- Makers: Beech 115, Helio 73, Aero Commander 31, Grumman 25, Republic 19, Piaggio 12, Focke-Wulf 7, Dornier 6, Ryan 6, U T V A 4

Models with the most aircraft:

- [Lycoming GO-480 series](https://openairdocs.org/engine/lycoming-go-480-series): 246 aircraft (engine model)
- [Lycoming GSO&IGSO-480 series](https://openairdocs.org/engine/lycoming-gso-igso-480-series): 59 aircraft (engine model)
- [Lycoming GO-480-G1D6](https://openairdocs.org/engine/lycoming-go-480-g1d6): 7 aircraft (engine model)
- [Lycoming GO-480-G2D6](https://openairdocs.org/engine/lycoming-go-480-g2d6): 3 aircraft (engine model)
- [Lycoming GO-480-G1A6](https://openairdocs.org/engine/lycoming-go-480-g1a6): 1 aircraft (engine model)
- [Lycoming GO-480-G1B6](https://openairdocs.org/engine/lycoming-go-480-g1b6): 1 aircraft (engine model)
- [Lycoming GSO-480-B1B6](https://openairdocs.org/engine/lycoming-gso-480-b1b6): 1 aircraft (engine model)

All 7 models: https://openairdocs.org/ad/60-11-06/models.md
Every aircraft: https://openairdocs.org/ad/60-11-06/aircraft.md

Its text cites no advisory circulars or STCs.

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