# AD 71-13-01: Fuel Injector Manifold To Nozzle Tube Assemblies

- Type: Airworthiness directive
- Status: Historical
- Products: Lycoming Engines TIO-540-A1A, TIO-540-A1B, TIO-540-A1C, TIO-540-A2A, TIO-540-A2B and TIO-540-A2C
- Effective: June 22, 1971
- Superseded by: [AD 71-13-01 R1](https://openairdocs.org/ad/71-13-01-R1)
- Product type: Engine
- Amendment: 39-1231
- Registered aircraft: 5,092 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/967A088F802B31BF8625682C00749EF5.0001
- DRS record last changed: August 7, 2025
- Page: https://openairdocs.org/ad/71-13-01

## The airworthiness directive

71-13-01 AVCO LYCOMING: Amdt. 39-1231. Applies to TIO 540-A series engines with serial numbers lower than 1931-61. Compliance required within the next 50 hours' time in service after the effective date of this AD, unless already accomplished. To prevent possible failures of the fuel injector manifold to nozzle tube assemblies accomplish the following: 1. Visually inspect each tube assembly for fuel stains, cracks, dents and bend radii under 5/8 inch. Replace cracked or dented lines and increase bends to 5/8 inch or more without denting or kinking before further flight. 2. Install support clamps in accordance with the instructions contained in Lycoming Service Bulletin No. 335 or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region. This amendment is effective June 22, 1971.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E14EA](https://openairdocs.org/tcds/E14EA): Lycoming Engines; names 6 of 40 models: TIO-540-A1A, TIO-540-A2A, TIO-540-A2C, TIO-540-A1B, TIO-540-A2B, TIO-540-A1C

## 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: 5,092 (0 by airframe model, 5,092 by engine model)
- Makers: Piper 3,665, Cessna 632, Mooney 222, Aero Commander 117, Bellanca 111, Smith 98, Rockwell International 92, Socata 51, Commander 21, Aerofab 17

Models with the most aircraft:

- [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series): 4,886 aircraft (engine model)
- [Lycoming TIO-540 series](https://openairdocs.org/engine/lycoming-tio-540-series): 191 aircraft (engine model)
- [Lycoming TIO-540-A2C](https://openairdocs.org/engine/lycoming-tio-540-a2c): 6 aircraft (engine model)
- [Lycoming TIO-540-A1A](https://openairdocs.org/engine/lycoming-tio-540-a1a): 5 aircraft (engine model)
- [Lycoming TIO-540-A2B](https://openairdocs.org/engine/lycoming-tio-540-a2b): 4 aircraft (engine model)

All 6 models: https://openairdocs.org/ad/71-13-01/models.md
Every aircraft: https://openairdocs.org/ad/71-13-01/aircraft.md

## Related documents

- [AD 71-13-01 R1](https://openairdocs.org/ad/71-13-01-R1): Rescinding an airworthiness directive · Lycoming Engines TIO-540-A1A, TIO-540-A1B, TIO-540-A1C and 13 more. Effective Mar 8, 2012. Supersedes this AD

Its text cites no advisory circulars or STCs.

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