AD 60-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 680-E | Airworthiness Directives; Aero Commander Model 680-E and 720 Aircraft |
| aircraft | Twin Commander Aircraft LLC | 720 | Airworthiness Directives; Aero Commander Model 680-E and 720 Aircraft |
Unsafe Condition
AN 426AD-5 rivets were installed instead of 3/16-inch huckbolts in the lower surface of the wing at the rear spar between wing station 54 and the inboard nacelle attach angle on both left and right wings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the lower wing at rear spar between wing station 54 and the inboard nacelle attach angles on both wings to determine rivet type. If AN 426AD-5 rivets are present, remove flaps and wing trailing edge skins, drill out the rivets, and replace with AN 426AD-6 rivets. Ensure rivet spacing meets requirements, adding a brazier head rivet if only five exist, and contact manufacturer if spacing issues arise.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours' time in service after the effective date of this amendment
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Aero Commander Model 680-E and 720, Serial Numbers 501, 623 Through 873 Except 820, 850, 860, 867 and 872
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
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