2021-15-52: Main rotor system
Emergency order 2021-15-52 is an airworthiness directive. The FAA's subject line: Main rotor system. It names Bell HH-1, Bell UH-1 Huey (Iroquois), Northwest Rotorcraft Llc UH-1, Southwest Florida Aviation SW205: about 428 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
- Arrow Falcon Exporters, Inc.; AST, Inc; Bell Textron, Inc.; California Department of Forestry; Global Helicopter Technology, Inc.; Hagglund Helicopters, LLC; International Helicopters, Inc.; JJASPP Engineering Services LLC; Northwest Rotorcraft, LLC; Overseas Aircraft Support, Inc.; Red Tail Flying Services LLC; Richards Heavylift Helo, Inc.; Robinson Air Crane, Inc.; Rotorcraft Development Corporation; San Joaquin Helicopters; Smith Helicopters; Southwest Florida Aviation International; Tamarack Helicopters, Inc.; West Coast Fabrications; WSH LLC
- Models
- UH-1H, UH-1F, TH-1L, UH-1E, UH-1L, UH-1F, UH-1H, UH-1H, UH-1B, UH-1H, UH-1H, TH-1L, UH-1B, UH-1E, UH-1H, UH-1L, UH-1B, UH-1A, UH-1B, UH-1H, TH-1F, UH-1F, UH-1P, HH-1K, TH-1F, TH-1L, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, UH-1P, UH-1B, UH-1E, SW204 (UH-1B), SW204HP (UH-1B), SW205 (UH-1H), TH-1F, UH-1F, UH-1H, UH-1E, UH-1B
- On this site
- Bell HH-1 13 registered
Bell UH-1 Huey (Iroquois) 404 registered
Northwest Rotorcraft Llc UH-1 6 registered
Southwest Florida Aviation SW205 5 registered
Dates and paperwork
- Docket
- Unknown
- Replaced by
- 2022-06-05
- Status
- Historical
- The FAA's document
- Read the order on the FAA's site
Related safety bulletins advice on the same designs, not orders
2019-02-19SW-18-29R1 · Rotorcraft Tail Boom, Attach Structure Failure
2018-10-01SW-18-29 · Rotorcraft Tail Boom, Attach Structure Failure
2012-07-30SW-12-38 · Emergency Push Out Window Retention
2007-05-02SW-07-33 · Quick connect fittings
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 7, 2026. Connections as data: /graph/directive/2021-15-52.json · aircraft systems.