AD 73-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 500 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-A | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-B | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-U | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 520 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-A | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-E | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-F | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680 | Airworthiness Directives; Aero Commander Model 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P) and 720 Series Airplanes |
Unsafe Condition
Failure to prevent siphoning of fuel from the fuel tanks could lead to fuel exhaustion and resultant stoppage of both engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace standard fuel cap assemblies with non-siphoning fuel cap assemblies using Aero Commander Kit No. 87A-1 or 87A-2, depending on model and serial number. Equivalent replacement parts approved by the FAA may be used.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 200 hours' time in service after the effective date of this AD, unless already accomplished. The compliance time may be adjusted up to a maximum of 50 hours to coincide with the aircraft's annual or 100 hour scheduled inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Aero Commander Models 500, 500A, 500B, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P), and 720 series airplanes, with specific serial ranges as specified in the AD.
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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