AD 2008-22-53
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. Model MD900 Helicopters |
Unsafe Condition
Failure of the left Vertical Stabilizer Control System (VSCS) adapter tubes on MD900 helicopters, leading to uncontrollable vertical stabilizer and reduced yaw control.
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Required Actions
Turn ON both VSCS switches and turn OFF the autopilot (AP/SAS) switch; pull and cable-tie certain AP/SAS circuit breakers; install a placard near the AP/SAS master switch; install an airspeed limitation placard on the instrument panel; revise the Rotorcraft Flight Manual (RFM) limitations and emergency procedures sections.
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Compliance Time
Before further flight
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Affected Aircraft
MD Helicopters, Inc. Model MD900 helicopters with the affected adapter tube installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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