# AD 81-03-05: Mixture Control Shaft Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Lycoming Engines IGO-540-A1A, IGO-540-B1A, IGO-540-B1C, IGSO-480-A1E6, IGSO-540-A1A, IGSO-540-A1C, IGSO-540-A1D, IGSO-540-A1E, IGSO-540-A1H, IO-540-A1A5, IO-540-B1C5 and IO-540-K1E5
- Effective: February 11, 1981
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-4038
- Registered aircraft: 4,250 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9D2C159E728B8283862568420052BB76.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/81-03-05

## The airworthiness directive

81-03-05 AVCO LYCOMING: Amendment 39-4038. Applies to all IGSO-480-A1E6 with S/Ns up to and including L-2066-44; IO-540-A1A5 with S/Ns up to and including L-19212-48; IO-540-B1C5 with S/Ns up to and including L-9631-48; IO-540-K1E5 with S/Ns up to and including L-19698-48A; IGO-540-A1A, -B1A, - B1C with S/Ns up to and including L-339-49; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H with S/Ns up to and including L-3637-50. Compliance required within the next 50 hours' in service after the effective date of this AD, unless already accomplished. To prevent fuel leakage in the mixture control shaft assembly on Bendix Model RS-10FB1, RS-10ED1, RS-10ED2, RS-10B1 and RS-10B2 fuel injectors, accomplish the following: a. Modify the mixture control shaft assembly with new parts in accordance with Bendix Service Bulletin RS-62, Rev. 1, dated 2/14/80, or FAA approved equivalent. b. All modified fuel injectors must be reidentified in accordance with instructions noted in the above Service Bulletin. Equivalent methods of compliance must 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. Lycoming Service Bulletin No. 444 also pertains to this subject. This amendment is effective February 11, 1981.

## Affected data sheets (4) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1E7](https://openairdocs.org/tcds/1E7): Lycoming Engines; names 5 of 8 models: IGSO-540-A1H, IGSO-540-A1C, IGSO-540-A1A, IGSO-540-A1D, IGSO-540-A1E
- [TCDS 1E11](https://openairdocs.org/tcds/1E11): Lycoming Engines; names 3 of 6 models: IGO-540-B1A, IGO-540-B1C, IGO-540-A1A
- [TCDS 1E4](https://openairdocs.org/tcds/1E4): Lycoming Engines; names 3 of 81 models: IO-540-A1A5, IO-540-B1C5, IO-540-K1E5
- [TCDS E-284](https://openairdocs.org/tcds/E-284): Lycoming Engines; names 1 of 23 models: IGSO-480-A1E6

## 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: 4,250 (0 by airframe model, 4,250 by engine model)
- Makers: Piper 1,480, Cessna 1,110, Robinson Helicopter 297, Maule 230, Socata 156, Rockwell International 85, Commander 63, Smith 38, Bellanca 27, Aerofab 26

Models with the most aircraft:

- [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series): 4,219 aircraft (engine model)
- [Lycoming IO-540-A1A5](https://openairdocs.org/engine/lycoming-io-540-a1a5): 16 aircraft (engine model)
- [Lycoming IGO-540-B1A](https://openairdocs.org/engine/lycoming-igo-540-b1a): 9 aircraft (engine model)
- [Lycoming IO-540-K1E5](https://openairdocs.org/engine/lycoming-io-540-k1e5): 5 aircraft (engine model)
- [Lycoming IGSO-480-A1E6](https://openairdocs.org/engine/lycoming-igso-480-a1e6): 1 aircraft (engine model)

All 6 models: https://openairdocs.org/ad/81-03-05/models.md
Every aircraft: https://openairdocs.org/ad/81-03-05/aircraft.md

Its text cites no advisory circulars or STCs.

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