# AD 71-20-05: Idler Pulley Bearings

- Type: Airworthiness directive
- Status: Current
- Products: Schweizer 269A, 269A-1 and 269B
- Effective: December 18, 1971
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-1301
- Registered aircraft: 134 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6243EDB0096F845186256E01005AD584.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/71-20-05

## The airworthiness directive

71-20-05 HUGHES: Amdt. 39-1301 as amended by Amendment 39-1359. Applies to Model 269A, 269A-1, and 269B Helicopters.

Compliance required as indicated.

To prevent failures of idler pulley bearings accomplish the following:

  (a) Within 50 hours time in service after the effective date of this AD, unless already accomplished, remove from service the aluminum idler pulley shaft, P/N 269A5440 (if installed) and idler pulley bearings, and install steel idler pulley shaft, P/N 269A5438 and idler pulley bearings, P/N 269A5050-58, in accordance with Hughes Service Information Notice N-1.4, dated September 15, 1971, or later FAA approved revision, or an equivalent installation and procedure approved by the Chief, Aircraft Engineering Division, FAA Western Region. Mutilate bearings and aluminum shafts to prevent return to service.

  (b) After the accomplishment of (a), above, at intervals not to exceed 200 hours time in service thereafter, replace the idler pulley bearingsin accordance with Hughes Service Information N-95, dated September 15, 1971, or later FAA approved revisions, or an equivalent replacement and procedure approved by the Chief, Aircraft Engineering Division, FAA Western Region. Mutilate old bearings to prevent return to service.

This supersedes Amendment 39-77, (30 F.R. 7371), AD 65-12-02, as revised on February 2, 1966 (31 F.R. 1267).

Amendment 39-1301 became effective October 1, 1971.

This amendment 39-1359 becomes effective December 18, 1971.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4H12](https://openairdocs.org/tcds/4H12): Schweizer RSG LLC; names 3 of 6 models: 269B, 269A-1, 269A

## 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: 134 (134 by airframe model, 0 by engine model)
- Makers: Hughes 133, Schweizer 1

Models with the most aircraft:

- [Hughes 269A](https://openairdocs.org/model/hughes-269a): 97 aircraft (airframe model)
- [Hughes 269B](https://openairdocs.org/model/hughes-269b): 31 aircraft (airframe model)
- [Hughes 269A-1](https://openairdocs.org/model/hughes-269a-1): 5 aircraft (airframe model)
- [Schweizer 269A](https://openairdocs.org/model/schweizer-269a): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/71-20-05/models.md
Every aircraft: https://openairdocs.org/ad/71-20-05/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.