AD 2013-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc., Helicopters |
Unsafe Condition
A decrease, over time, in the strength of a T-T strap caused by moisture, which could result in failure of a T-T strap, loss of directional control, and subsequent loss of control of the helicopter.
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Required Actions
Determine the manufacturer's cure date of each T-T strap. Replace T-T straps with five or more calendar years from the cure date before further flight. Mark the expiration date on T-T straps with less than five calendar years from the cure date. Thereafter, mark the expiration date on T-T straps before installation.
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Compliance Time
Within six months
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Affected Aircraft
MD Helicopters, Inc. Model 500N and 600N helicopters with NOTAR fan blade T-T strap, P/N 500N5311-5; and MDHI Model MD900 helicopters with T-T strap, P/N 500N5311-5, P/N 900R3442009-101, P/N 900R3442009-103, or P/N 900R6442009-103.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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