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56-22-02: Wing Attachment Washers

FAA order 56-22-02 is an airworthiness directive. The FAA's subject line: Wing Attachment Washers. It names Helio H-391: about 16 aircraft on the U.S. register today, 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
On this site
Helio H-391 16 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 (621 characters)
56-22-02 HELIO: Applies to Model H-391B Aircraft, Serial Numbers 003 to 029 Inclusive. Compliance required within next 100 hours. Cases have been reported of finding cracked upper wing attachment thrust washers, P/N HS-15. These are special heat-treated washers installed beneath the head of the bolt attaching the top of the front wing spar to the carry-through structure. Accordingly, these washers must be replaced with new improved type procured from the airplane manufacturer. (Helio Field Service Bulletin No. 13 dated July 18, 1956, covers this same subject and specifies the bolt torque requirements.)

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 October 30, 2026. Connections as data: /graph/directive/56-22-02.json · aircraft systems.