75-04-02: Main Rotor Spindles
FAA order 75-04-02 is an airworthiness directive in force since February 19, 1975. The FAA's subject line: Main Rotor Spindles. It names Sikorsky S-55, Sikorsky UH-19: about 22 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: rotorcraft systems.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Orlando Helicopter Airways, Inc.; Sikorsky Aircraft Corporation
- Models
- CH-19E, H-19A, H-19D, H-19G, HRS-1/CH-19, HRS-3/H-19B, UH-19D, S-55, S-55B, S-55C, S62A
- On this site
- Sikorsky S-55 15 registered
Sikorsky UH-19 7 registered
Dates and paperwork
- In force since
- February 19, 1975
- 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 (1,266 characters)
75-04-02 SIKORSKY AIRCRAFT: Amendment 39-2082. Applies to S-55, S-55B, S-55C and S-62A Helicopters certificated in all categories, including military type HRS-1, HRS-3, CH-19, H-19B, H-19G, H-19A, H-19D, HO4S-3G, UH-19D, H19D5, UH-19B, UH-19D helicopters, equipped with P/N S10-10-3325-1 and S10-10-3325-2 main rotor spindles.
(a) Within the next 10 hours' time in service after the effective date of this AD, unless already accomplished within the preceding 50 hours' time in service, conduct a dye penetrant inspection of the exposed areas of the lugs of the main rotor spindles.
(b) If a crack is found during the above inspection, replace the cracked spindle with a spindle that has been inspected in accordance with paragraph (a) above and found to be free of cracks, prior to flight.
(c) Report in writing any cracks found during the inspection of paragraph (a) to: Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803. Each report must include the length and location of the cracks and the total time in service of the spindle.
Sikorsky message SST62A6C74.3 covers this inspection.
This amendment becomes effective February 19, 1975.
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 October 5, 2026. Connections as data: /graph/directive/75-04-02.json · aircraft systems.