50-06-01: Ventral Fin Replacement
FAA order 50-06-01 is an airworthiness directive. The FAA's subject line: Ventral Fin Replacement. It names Bell 47: about 478 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: airframe structure.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Scotts-Bell 47 Inc
- Models
- 47D1
- On this site
- Bell 47 478 registered
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 (555 characters)
50-06-01 BELL: Applies to All Model 47D1 Helicopters.
Compliance required not later than March 31, 1950.
Ventral fin installation, Bell P/N 47-267-058 should be replaced by the revised ventral fin and fixed tab installation, Bell P/N 47-267-063. The new installation is designed to eliminate the possibility of those fatigue failures which have been experienced in the old design.
Upon completion of the above modifications, the inspections required by AD 49-34-02 may be discontinued.
(Bell Service Bulletin No. 71 covers the same subject.)
Related safety bulletins advice on the same designs, not orders
2001-02-09SW-01-13 ·
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/50-06-01.json · aircraft systems.