STC SP1521SO
FAA DRS lists SP1521SO as Current · Amended, held by Northwest Propeller Services Inc., for Hamilton Standard Division 12D40 and Hamilton Standard Division 2D30. Recorded change: Install Northwest Propeller Service Counterweight Thrust Bearings in place of the Hamilton Standard Counterweight Thrust Bearings. Snapshot dated June 30, 2026.
Recorded modification
What the FAA record covers
SP1521SO identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.
Applicability
Aircraft named in FAA DRS
Named aircraft: Hamilton Standard Division 12D40 and Hamilton Standard Division 2D30. Confirm the approved model list, serial effectivity, configuration, and certificate revision.
Related propellers STCs
Installation of Hartzell Model PHC-(C,L)3YF-1RF/F8068 three bladed propeller.
FAA holder: D'Shannon Products Ltd.
Installation of a Hartzell Propeller model .HC-B4TN-3C/T10702NS (4 Blade).
FAA holder: Aero Innovations LLC
FAA record reference
- STC number
- SP1521SO
- Product
- Propeller
- Country
- United States
- Application date
- April 7, 1983
- Revision date
- August 6, 2003
- CFR references
- Part 21