52-01-02: Horns and Drag Brace Fittings

FAA order 52-01-02 is an airworthiness directive. The FAA's subject line: Horns and Drag Brace Fittings. 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: other and general.

What it applies to as the FAA lists it

Kind of product: Aircraft
Makes: Scotts-Bell 47 Inc
Models: 47B, 47B3, 47D
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 (599 characters)

52-01-02	BELL:  Applies to All Models 47B, and 47B3 Helicopters and to Model 47D Helicopters Serial Numbers 1 to 79, Inclusive. 

	Compliance required at next 300-hour overhaul, but not later than March 1, 1952. 

	To increase the safety of the main rotor blade equalizer horns and drag brace fittings, which have failed in accidents involving damage to the main rotor, replace the existing equalizer horn (P/N 47-120-027-2) and drag brace fitting (P/N 47-110-145-2) with revised parts P/N 47- 120-167-1 and P/N 47-110-235-1, respectively. 

	(Bell Service Bulletin No. 77 covers this 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/52-01-02.json · aircraft systems.