# AD 75-22-02: Secondary Failure N2 Accessory Drive Shaft

- Type: Airworthiness directive
- Status: Current
- Products: Honeywell International T5307A, T5309A, T5309B, T5309C, T5311A, T5311B, T5313A, T5313B and T5317A
- Effective: October 29, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-2385
- Registered aircraft: 133 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6B6E56441264DE1A8625682B0048B5E9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-22-02

## The airworthiness directive

75-22-02 AVCO LYCOMING: Amendment 39-2385. Applies to all Avco Lycoming T53 series engines. To prevent secondary failure of the N2 accessory drive shaft, as a result of binding of the torquemeter boost pump drive shaft, remove torquemeter boost pump, Part Number 1-300-221-01 or Part Number 1-300-221- 02, and replace with Part Number 1-300-221-03 or Part Number 1-300-221-04 within 200 hours time in service after the effective date of this AD. NOTE: Avco Lycoming Service Bulletin Number 0031 pertains to this subject. This amendment becomes effective October 29, 1975.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E1EA](https://openairdocs.org/tcds/E1EA): Ozark Aeroworks LLC; names 5 of 5 models: T5309B, T5309A, T5311A, T5311B, T5309C
- [TCDS E17EA](https://openairdocs.org/tcds/E17EA): Ozark Aeroworks LLC; names 3 of 6 models: T5313B, T5317A, T5313A
- [TCDS E8EA](https://openairdocs.org/tcds/E8EA): Ozark Aeroworks LLC; names 1 of 1 models: T5307A

## 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: 133 (0 by airframe model, 133 by engine model)
- Makers: Bell 96, Garlick Helicopters 8, Grumman 4, Kaman Aerospace 3, Southwest Florida 3, Bell Helicopter Textron 2, Kaman 2, Western International Avia 2, Williams Helicopter 2, Anderson Douglas 1

Models with the most aircraft:

- [Lycoming T-53 series](https://openairdocs.org/engine/lycoming-t-53-series): 95 aircraft (engine model)
- [Honeywell T5317A](https://openairdocs.org/engine/honeywell-t5317a): 11 aircraft (engine model)
- [Honeywell T5317 series](https://openairdocs.org/engine/honeywell-t5317-series): 9 aircraft (engine model)
- [Lycoming T5313B](https://openairdocs.org/engine/lycoming-t5313b): 8 aircraft (engine model)
- [Honeywell T5313B](https://openairdocs.org/engine/honeywell-t5313b): 5 aircraft (engine model)
- [Lycoming T5311B](https://openairdocs.org/engine/lycoming-t5311b): 2 aircraft (engine model)
- [Lycoming T5317A](https://openairdocs.org/engine/lycoming-t5317a): 2 aircraft (engine model)
- [Honeywell T5309B](https://openairdocs.org/engine/honeywell-t5309b): 1 aircraft (engine model)

All 10 models: https://openairdocs.org/ad/75-22-02/models.md
Every aircraft: https://openairdocs.org/ad/75-22-02/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.