59-20-01: Spar Weight Assembly Straps
FAA order 59-20-01 is an airworthiness directive. The FAA's subject line: Spar Weight Assembly Straps. System: airframe structure.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Boeing Defense & Space Group
- Models
- 44A, 44B
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (701 characters)
59-20-01 VERTOL: Applies to all Model 44 Series Helicopters.
Compliance required as indicated.
Due to recent failure of a strap, unless already accomplished, all straps P/N 42R1011-1 of spar weight assembly P/N 42R1009-1 in all metal forward rotor blades are to be inspected within the next twenty hours of flight in accordance with Vertol Engineering Order No. 7A (Drawing No. 42R1011). Straps found satisfactory under these inspections are acceptable for 600 hours' retirement life. Straps found with crack indications are to be replaced immediately.
When replacement straps P/N 107R1211 are incorporated, the provisions of this directive no longer apply.
This supersedes AD 59-11-02.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/59-20-01.json · aircraft systems.