- Effective
- August 23, 1967
- Model
- A6441FN-606
- Data sheet
- TCDSP-898
- Product
- Propeller
- Amendment
- 39-466
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.
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The airworthiness directive
67-20-01 ALLISON - AERO PRODUCTS: Amdt. No. 39-439 as revised Amdt. 39-466, Part 39, Federal Register June 29, 1967. Applies to Models A6441FN-606 and A6441FN-606A Propellers.
Compliance required as indicated, unless already accomplished.
To prevent serious overspeeds and to make the propeller pitch lock more effective under remote combinations of critical component failures, accomplish the following:
(a) On or before November 1, 1967, install Part No. 6859637 restrictor in the increase pitch port of each hub island, as outlined in Allison Commercial Service Letter CSL 189, Pages 14 and 15, Paragraph C2b(1)(2)(3) and (4), entitled "Hub Assembly - Preparation for Assembly."
(b) On or before November 1, 1967, remove the eight master gear retention bolts and install eight P/N 6859881 bolts as replacements, as outlined in Allison's Commercial Propeller Bulletin, CPB No. 63-317.
This amendment effective August 23, 1967.
Revised August 23, 1967.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.