50-12-01: Propeller Blade
FAA order 50-12-01 is an airworthiness directive. The FAA's subject line: Propeller Blade. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Appliance
- Makes
- Hamilton Standard; Teledyne Continental Motors
- Models
- Propeller Blades, W670-16, W670-6A, W670-6N
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (976 characters)
50-12-01 HAMILTON STANDARD: Applies to All Aircraft Equipped With Continental Engines, Models W-670-6A (R-670-3, -5), W-670-6N (R-670-4), W-670-16 (R-670-8, -11, - 11A) and Hamilton Standard Ground Adjustable Propellers Having Blades, Model 11C1 (Navy 4350, 4350F, 4350F1).
Compliance required not later than April 15, 1950.
To minimize the possibility of propeller blade shank fatigue failures as a result of noncompliance with a mandatory engine operation restriction, the following precautionary measures should be taken:
(1) Check the marking on the engine tachometer and correctly mark it, if necessary, with a red arc which covers the entire r.p.m. range above the higher side of the 1,900 r.p.m. graduation.
(2) Install placard in aircraft to read: "Avoid all engine operation above 1,900 r.p.m. except during takeoff".
(3) Check position of the propeller and correctly index, if necessary, in the zero degree position (blades in line with crankthrow).
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/50-12-01.json · aircraft systems.