# AD 81-13-05: Leading Edge

- Type: Airworthiness directive
- Status: Current
- Products: Dowty Propellers CR 289/3-110-F/1 and CR 289/3-110-F/11
- Effective: July 28, 1981
- Superseded by: Nothing supersedes this AD
- Product type: Propeller
- Amendment: 39-4169
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3C3FB85DE607365B862569660070A425.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/81-13-05

## The airworthiness directive

81-13-05 DOWTY ROTOL: Amendment 39-4169. Applies to Dowty Rotol (c)R.289/3-110-F/1 and (c)R.289/3-110-F/11 propellers used on the WSK-Pezetel Model PZL-3S engine installed on but not limited to Gulfstream American (formerly Grumman) Model G-164A, B, C airplanes modified by STC SA2731SW, and Ayres (formerly Rockwell) Model S2R-R3S, and Model S2R airplanes modified by STC SA3897WE.

Compliance is required as indicated unless previously accomplished. To preclude the possibility of blade tip failures, accomplish the following:

Prior to each engine start or prior to accumulating 3 hours of engine/propeller operating time, whichever occurs first, using a 2x to 5x power magnifying glass, or equivalent, visually inspect for cracks, scratches, pitting, nicks, dents or gouges the outer 15 inches of the leading edge on propeller blades, P/N 660705335, in the area extending at least one inch on either side of the leading edge. No cracks or damage are permitted. Any blades with cracks must be replaced with an airworthy blade before further flight. All surface damage in the form of scratches, pitting, nicks, dents or gouges must be removed before further flight in accordance with Dowty Rotol Service Instructions or Section 3 of Advisory Circular 43.13-1A.

In addition, prior to accumulating 15 hours of engine/propeller operating time, using dye penetrant or equivalent, inspect the outer 15 inches of the leading edge of propeller blades, P/N 660705335, in the area extending at least one inch on either side of the leading edge for cracks and reinspect at least once every 15 operating hours thereafter. No cracks are permitted, and any blades with cracks must be replaced with an airworthy blade before further flight.

Upon request of the operator, an equivalent means of compliance with the requirement of this AD may be approved by the Chief, Engineering and Manufacturing Branch, FAA, Great Lakes Region.

This amendment becomes effective July 28, 1981, asto all persons except those to whom it was made immediately effective by the priority mail letter dated June 12, 1981, AD 81-13-05, which contained this amendment.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS P6EU](https://openairdocs.org/tcds/P6EU): Dowty Propellers; names 2 of 3 models: CR 289/3-110-F/1, CR 289/3-110-F/11

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

## Related documents

- [AC 43.13-1B CHG 1 Ed Update](https://openairdocs.org/ac/43.13-1): Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair. Cited as AC 43.13-1A in the AD's requirements
- [STC SA2731SW](https://openairdocs.org/stc/SA2731SW): Installation of PZL-3S engine and WSK US-132000/A propeller. Lyon Flying Service Inc, Named in the applicability
- [STC SA3897WE](https://openairdocs.org/stc/SA3897WE): Installation of Pezetel Model PZL-3S engine and Dowty Rotel Model CR289/3-110-F/1 propeller in accordance with Serv-Aero Engineering, Inc. Installation Procedure No. 32679, dated March 26, 1979.  Parts manufactured in accordance with FAA sealed Serv-Aero Master Drawing List No. MDL-9500, dated March 26, 1979, or later FAA approved revision.  (S2R RESTRICTED CATEGORY). Thrush Aircraft Inc., Named in the applicability

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