AD 2006-18-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. Model MD900 Helicopters |
Unsafe Condition
Failure of a tension-torsion (TT) strap in the Notar fan system, leading to loss of directional control and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Reduce the life limit of TT straps P/N 900R3442009-103 and 900R6442009-103 from 3,034 to 2,500 hours TIS and revise the component history card. Remove and inspect (visually and via X-ray) TT straps with 1,190 or more hours TIS within 10 hours TIS, and repeat inspections at intervals not exceeding 300 hours TIS. For TT straps with less than 1,190 hours TIS, inspect before accumulating 1,200 hours TIS and repeat inspections at intervals not exceeding 300 hours TIS. Replace any unairworthy TT strap before further flight.
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Compliance Time
Before further flight for life limit reduction; within 10 hours TIS for initial inspections of straps with 1,190+ hours TIS; at intervals not exceeding 300 hours TIS for subsequent inspections.
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Affected Aircraft
MD Helicopters, Inc. Model MD900 helicopters with a Notar fan system that has a TT strap, part number (P/N) 900R3442009-103, 900R6442009-103, 900R3442009-101, or 500N5311-5, installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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