# AD 72-14-01: Blade Bearing Retaining Bolts

- Type: Airworthiness directive
- Status: Current
- Products: Dowty Propellers (c) R.209/4-40-4.5, (c) R.245/4-40-4.5, (c) R.259/4-40-4.5, (c) R130/4-20-4/, (c) R148/4-20-4/, (c) R175/4-30-4/, (c) R179/4-20-4/, (c) R184/4-30-4/, (c) R186/4-30-4/, (c) R187/4-30, (c) R193/4-30-4/ and (c) R257/4-30-4/
- Effective: July 22, 1972
- Superseded by: Nothing supersedes this AD
- Product type: Propeller
- Amendment: 39-1473
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FAE14D2A97A175EE8625696D0065E553.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/72-14-01

## The airworthiness directive

72-14-01 DOWTY ROTOL, LTD: Amdt. 39-1473. Applies to Dowty Rotol Propeller Types (c)R130/4-20-4/12E, (c)R186/4-30-4/16, (c)R187/4-30-4/18, (c)R193/4-30-4/50, (c)R184/4-30-4/50, (c)R259/4-40-4.5/17, (c)R148/4-20-4/21E, (c)R175/4-30-4/13E, (c)R179/4- 20-4/33, (c)R257/4-30-4/60, (c)R245/4-40-4.5/13, and (c)R209/4-40-4.5/2. These propellers are installed on, but not necessarily limited to, BAC Viscount Models 744, 745D, and 810; Armstrong Whitworth Model Argosy AW.650 Series 101; Fairchild and Fokker Models F27 and F227; Handley Page Model Herald; and Grumman Model Gulfstream G-159 airplanes.

Compliance is required as indicated unless already accomplished.

To prevent failure of a propeller blade due to the disengagement of the blade bearing retaining bolts resulting from excessive wear on the teeth of the locking segments, accomplish the following:

Within the next 5,000 hours' time in service or at the next propeller overhaul, after the effective date of this AD, whichever occurs sooner, incorporate Dowty Rotol Modification No. (c) VP.2676 (Rev. 1) in accordance with Dowty Rotol Limited Service Bulletin No. 61-714, Revision 3, dated July 26, 1971, or an FAA-approved equivalent.

This amendment becomes effective 22 July, 1972.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS P-899](https://openairdocs.org/tcds/P-899): Dowty Propellers; names 6 of 9 models: (c) R175/4-30-4/, (c) R187/4-30, (c) R193/4-30-4/, (c) R184/4-30-4/, (c) R186/4-30-4/, (c) R257/4-30-4/
- [TCDS P-890](https://openairdocs.org/tcds/P-890): Dowty Propellers; names 3 of 5 models: (c) R148/4-20-4/, (c) R130/4-20-4/, (c) R179/4-20-4/
- [TCDS P2EU](https://openairdocs.org/tcds/P2EU): Dowty Propellers; names 3 of 3 models: (c) R.209/4-40-4.5, (c) R.245/4-40-4.5, (c) R.259/4-40-4.5

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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