90-21-01: Third stage stator assembly
FAA order 90-21-01 is an airworthiness directive. The FAA's subject line: Third stage stator assembly. It names the Honeywell TPE331-1, Honeywell TPE331-2, Honeywell TPE331-3U, Honeywell TPE331-5, Honeywell TPE331-6, Honeywell TPE331-series engines: about 37 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Makes
- Honeywell International Inc.
- Models
- TPE331-1, TPE331-2, TPE331-2UA, TPE331-3U, TPE331-3UW, TPE331-5, TPE331-5A, TPE331-6, TPE331-61-A, TSE331-3U
- Engine series
- Honeywell TPE331-1 1 aircraft
Honeywell TPE331-2 3 aircraft
Honeywell TPE331-3U 1 aircraft
Honeywell TPE331-5 2 aircraft
Honeywell TPE331-6 3 aircraft
Honeywell TPE331-series 27 aircraft
Dates and paperwork
- Docket
- 90-ANE-18-AD
- Replaced by
- 91-04-02
- Status
- Historical
- The FAA's document
- Read the order on the FAA's site
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/90-21-01.json · aircraft systems.