# AD 70-16-09: High Speed Pinion Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Honeywell International TPE331-3W
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-1064
- Registered aircraft: 520 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AD52B243541EFDFC862568250067254E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-16-09

## The airworthiness directive

70-16-09 AIRESEARCH: Amdt. 39-1064. Applies to Model TPE331-3W-301A engines, S/N P01001 through P-01010 and P-01012, P-01014, and P-01015, installed in but not limited to Handley-Page Model C10A aircraft.

This directive necessary because of a serious condition which may be caused by backing off of the high speed pinion retaining nut. To prevent engine failures from this cause, the following is required: Replace the high speed pinion assembly P/N 869441-2 in accordance with AiResearch telegraphic service bulletin No. 622, dated July 24, 1970, or later FAA approved revision, prior to further use.

This amendment is effective upon publication in the Federal Register for all persons except those to whom it was made effective immediately by telegram dated July 24, 1970.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E4WE](https://openairdocs.org/tcds/E4WE): Honeywell Aerospace US LLC; names 1 of 48 models: TPE331-3W

## 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: 520 (0 by airframe model, 520 by engine model)
- Makers: Cessna 104, Mitsubishi 102, Ayres 52, Rockwell International 46, Fairchild 39, Swearingen 39, Gulfstream AM Corp Comm Div 19, Aero Commander 14, Beech 14, Construcciones Aeronauticas 13

Models with the most aircraft:

- [AiResearch TPE331 series](https://openairdocs.org/engine/airesearch-tpe331-series): 492 aircraft (engine model)
- [Honeywell TPE331-SER series](https://openairdocs.org/engine/honeywell-tpe331-ser-series): 28 aircraft (engine model)

All 3 models: https://openairdocs.org/ad/70-16-09/models.md
Every aircraft: https://openairdocs.org/ad/70-16-09/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.