# AD 53-09-04: Propeller Blades

- Type: Airworthiness directive
- Status: Current
- Products: Continental W-670-9A
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Registered aircraft: 987 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2AFFAC14111DAEF78625682C0069ABEA.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/53-09-04

## The airworthiness directive

53-09-04 CONTINENTAL: Applies to All Aircraft Equipped With Continental W-670-9A (Ordnance-Tank) Engines and Ground Adjustable Propellers Having Blades 11C1 (Hamilton Standard Model Designation) or 4350, 4350F, or 4350F1 (Navy Model Designation.) Compliance required not later than May 15, 1953. In the absence of suitable propeller vibration stress data, the following precautionary measures should be taken to minimize the possibility of propeller blade fatigue failures: (1) Disassemble propeller and inspect for cracks by etching the shank areas of the blades under the hub clamp rings. (2) Cut propellers to between 102 inches maximum and 100 inches minimum diameter. (3) Set blade angle so that static r.p.m. is between 1,500 and 1,975. (4) Install propeller on engine in the zero degree position (blades in line with crankthrow). (5) Placard airplane, "Do not exceed 1,900 r.p.m. for all operations except takeoff." (6) Remove all nicks and gouges from tip region andmaintain propeller blades as outlined in Civil Aeronautics Manual 18.

## 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: 987 (0 by airframe model, 987 by engine model)
- Makers: Boeing 576, Waco 199, Cessna 63, Fairchild 24, Curtiss Wright 18, Jones Peter M 13, Grumman 11, Travel Air 11, Timm 7, Snow 4

Models with the most aircraft:

- [Continental W670 series](https://openairdocs.org/engine/continental-w670-series): 987 aircraft (engine model)

All 1 models: https://openairdocs.org/ad/53-09-04/models.md
Every aircraft: https://openairdocs.org/ad/53-09-04/aircraft.md

Its text cites no advisory circulars or STCs.

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