AD 59-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing Defense & Space Group | 44A | Airworthiness Directives; VERTOL Model 44 Series Helicopters |
| aircraft | Boeing Defense & Space Group | 44B | Airworthiness Directives; VERTOL Model 44 Series Helicopters |
Unsafe Condition
Failure of strap P/N 42R1011-1 in the spar weight assembly P/N 42R1009-1 of metal forward rotor blades.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect straps P/N 42R1011-1 within the next twenty flight hours using Vertol Engineering Order No. 7A. Replace straps immediately if cracks are found; satisfactory straps have a 600-hour retirement life. Install replacement straps P/N 107R1211 to exempt from this AD.
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Compliance Time
within the next twenty hours of flight
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Affected Aircraft
Boeing Defense & Space Group Model 44A and 44B helicopters with metal forward rotor blades using spar weight assembly P/N 42R1009-1 and strap P/N 42R1011-1.
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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