- Models
- 44A, 44B
- Data sheet
- TCDS1H12
- Product
- Aircraft · Rotorcraft
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 19 KB | 7ac7dcfa…20600fa | FAA DRS (API key needed) |
On this page
The airworthiness directive
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.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.