SP8715SW
Installation of a 'R S W' blade thrust bearing assembly in all D-shank blades of counterweight type propellers. (2D 30) (23D 40) (12D 40) (22D 40) (3D 450) (24D 50). Held by Schweis Robert W, which holds 8 approved modifications in all. Last revised May 24, 1994. System: propeller.
What it applies to
- Kind of product
- Propeller
- Design holder
- Hamilton Standard Division; Hamilton Standard Division; Hamilton Standard Division; Hamilton Standard Division; Hamilton Standard Division; Hamilton Standard Division
- Models
- 3D, 2D, 12D, 23D, 22D, 24D
- Type certificates
- 249, P-206, P-257, P-719, P-736, P-784
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 7, 2026.