AD 57-09-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 520 | Airworthiness Directives; Aero Commander Model 520 560, 560A and 680 Aircraft |
| aircraft | Twin Commander Aircraft LLC | 560 | Airworthiness Directives; Aero Commander Model 520 560, 560A and 680 Aircraft |
| aircraft | Twin Commander Aircraft LLC | 560-A | Airworthiness Directives; Aero Commander Model 520 560, 560A and 680 Aircraft |
| aircraft | Twin Commander Aircraft LLC | 680 | Airworthiness Directives; Aero Commander Model 520 560, 560A and 680 Aircraft |
Unsafe Condition
Cracks in the aileron bellcrank casting in the vicinity of the aileron push-pull rod attach bolt.
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Required Actions
Inspect using dye penetrant or fluorescent methods for cracks in upper or lower lugs of bellcrank castings P/N 3510005 on bellcrank assemblies P/N 4510004-401 and 402. Replace defective castings and reattach push-pull rod with shim washers to eliminate clearance between casting lugs and rod-end bearing inner race. Discontinue 100-hour reinspection upon installation of revised casting per Aero Design Service Bulletin No. 41.
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Compliance Time
not later than the next 3 hours of flight or May 15, 1957, whichever occurs first and at 100-hour intervals thereafter
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Affected Aircraft
Twin Commander Aircraft LLC Model 520 (serial numbers 31 and above), 560, 560A, and 680 aircraft
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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