60-11-08: Pilot Bore
FAA order 60-11-08 is an airworthiness directive in force since November 14, 1961. The FAA's subject line: Pilot Bore. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Propeller
- Makes
- Sensenich Propeller Manufacturing Company, Inc.
- Models
- 74DM6, 74DM7
Dates and paperwork
- In force since
- November 14, 1961
- 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 (1,050 characters)
60-11-08 SENSENICH: Amdt. 166 Part 507 Federal Register May 28, 1960. Applies to M74DM Propellers Installed On Lycoming O-320-B Series Engines Except Propellers With An "A" or "K" prefix to the Serial Number.
Compliance required within the next 100 hours of flight time or by August 1, 1960, whichever comes first, and at each periodic inspection thereafter.
As a result of three incidents of cracked hubs, the following shall be accomplished:
(a) Remove the propeller and visually inspect for cracks originating in the pilot bore. In case of doubt, any of the approved methods for aluminum alloy inspections should be used. If cracks are found, the propeller shall be retired immediately from service.
(b) If no cracks are found, polish out any scratches in the bore and break and polish any sharp edges at the front and rear chamfer of the pilot bore.
(c) When the propeller is reinstalled, torque retaining bolts to 300 inch-pounds.
(Sensenich Service Bulletin No. R-8-1 covers the same subject.)
Revised November 14, 1961.
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/60-11-08.json · aircraft systems.