EASA SIB AIR750-2026-06-S-5700-ACS
Aug 10, 2026Lower Wing Skin Cracking
The Lower Wing Skin Cracking Airworthiness Concern Sheet issued by the Federal Aviation Administration (FAA) addresses reports of cracks in the lower wing skin cutouts near the main landing gear truss on Twin Commander aircraft models 500 series through 720. The document highlights Maintenance Alert MA23001 issued by Twin Commander Aircraft LLC, recommending recurring inspections to detect these cracks. It also references a related Australian Civil Aviation Safety Authority Airworthiness Directive AD/AC/92 for similar inspections on affected aircraft.
Safety Information Bulletin
- Twin Commander Aircraft 500
- Twin Commander Aircraft 520
- Twin Commander Aircraft 560F
- Twin Commander Aircraft 680
- Twin Commander Aircraft 690
- Twin Commander Aircraft 695
- Twin Commander Aircraft 720
- Twin Commander 500
- Twin Commander 520
- Twin Commander 560
- Twin Commander 680
- Twin Commander 690
- Twin Commander 700
- Twin Commander 720