53-03-01: Hartzell Propeller Vibration
FAA order 53-03-01 is an airworthiness directive. The FAA's subject line: Hartzell Propeller Vibration. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Sierra Hotel Aero, Inc.
- Models
- Navion B
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 (569 characters)
53-03-01 NAVION: Applies to All Model B Aircraft Equipped With Hartzell HC-12 X20-8C/9333C-0 Propellers.
Compliance required not later than March 15, 1953.
Vibration tests conducted subsequent to the initial tests of the Hartzell HC-12 X20- 8C/9333C-0 propeller installed on the Lycoming GO-435 engine revealed vibration characteristics of a hazardous nature. Therefore, to prevent possible blade cracks and/or failures, the existing r.p.m. restriction placard should be revised as follows:
"Avoid continuous ground operation between 1675 and 2150 engine r.p.m."
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/53-03-01.json · aircraft systems.