54-19-02: Servo Safety Clip

FAA order 54-19-02 is an airworthiness directive. The FAA's subject line: Servo Safety Clip. It names Sikorsky S-55: about 15 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: flight controls.

What it applies to as the FAA lists it

Kind of product: Aircraft
Makes: Orlando Helicopter Airways, Inc.; Sikorsky Aircraft Corporation
Models: HRS-1/CH-19, HRS-3/H-19B, S-55, S-55B, S-55C
On this site: Sikorsky S-55 15 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 (402 characters)

54-19-02   SIKORSKY:  Applies to All Model S-55 Helicopters. 

	Compliance required before October 1, 1954. 

	To insure against the loosening of the servo pilot valve locknut and subsequent improper servo operation, safety clips, Sikorsky P/N S-14-40-5194, should be installed and safetied to P/N S14-40-3227-24 lockwasher. 

	(Sikorsky Service Information Circular 1440-458 covers this same subject.)

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/54-19-02.json · aircraft systems.