AD 75-12-09 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 500 | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-A | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-B | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-S | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 500-U | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 520 | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560 | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-A | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-E | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
| aircraft | Twin Commander Aircraft LLC | 560-F | Airworthiness Directives; Rockwell Model 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 Airplanes |
Unsafe Condition
Inadvertent pilot induced structural failure
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install 'bob weights' in accordance with specified service bulletins or equivalent procedures approved by the FAA. Aircraft previously complying with earlier service bulletins must also comply with Service Bulletin No. 152 or 179 as applicable, including inspections and repairs per the bulletins.
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Compliance Time
Within 300 hours' time in service after the effective date of this AD (November 28, 1981) for initial installations. Subsequent inspections for some aircraft must be completed within 25 hours' time in service after specific dates (e.g., August 9, 1981 for certain models).
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Affected Aircraft
Rockwell Models 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), and 720 through Serial Number 3323, certificated in all categories.
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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