58-25-04: Fin Hinge Attachment
FAA order 58-25-04 is an airworthiness directive. The FAA's subject line: Fin Hinge Attachment. It names Helio H-391, Helio H-395: about 33 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: airframe structure.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Helio Aircraft LLC
- Models
- H-391B, H-395 (USAF L-28A or U-10B)
- On this site
- Helio H-391 16 registered
Helio H-395 17 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 (609 characters)
58-25-04 HELIO: Applies to Models H-391B and H-395 Aircraft Incorporating Three Fin Hinge Attachments.
Compliance required not later than next 100 hours operation or March 31, 1959, whichever occurs first.
Failure of the fin upper hinge attachment has been reported. Accordingly, the following inspection and replacement programs are required:
Inspect the fin top hinge and attachment details. Cracked parts must be replaced; uncracked parts may be reinstalled. In any case, new reinforcement gussets (P/N 391-022-001-16) must be installed.
(Helio Service Bulletin No. 18 covers this subject.)
Related safety bulletins advice on the same designs, not orders
2018-11-21SW-18-31 · NAVIGATION, ATTITUDE, AND DIRECTION DATA SYSTEM
2018-05-09CE-18-14 · Main Landing Gear: Improved inspection at Drag Brace Location
2008-09-09CE-08-47 · Wings - Attachment 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 November 6, 2026. Connections as data: /graph/directive/58-25-04.json · aircraft systems.