AD 98-08-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 500 | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-A | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-B | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-S | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-U | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 520 | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560 | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-A | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-E | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-F | Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes |
Unsafe Condition
Cracks in the wing to fuselage attachment brackets and straps at wing station 24 and fuselage frames could cause structural failure and loss of control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install access holes in both wing leading edges (or remove wing root farings for STC-modified titanium leading edges) and repetitively inspect the forward attach brackets and straps for cracks. Replace cracked parts or repair with approved schemes before further flight. Continue inspections at regular intervals as specified in Service Bulletin 223 revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to further flight if cracks are found. Inspections must be repeated at regular intervals until cracks are detected, then subsequent actions per AD parts II and III.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Twin Commander Aircraft Corporation 500, 600, and 700 series airplanes, including models 500, 500-A, 500-B, 500-S, 500-U, 520, 560, 560-A, 560-E, 560-F, 680, 680-E, 680-F, 680-..., and any with titanium leading edge STC modifications.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.