SA01980CH
Replacement of an existing Pratt and Whitney Model WASP S3H1 engine and Hamilton Standard Model 12D40 propeller with a Pratt and Whitney Model WASP S3H1-G engine and Hamilton Standard propeller with model 3D40 hub and blade model 6631A-S or model 23D40 hub with blade model 6601A-S, 7005A-S, or 7035A-S. Held by Larson AG, which holds 3 approved modifications in all. Last revised May 23, 2008. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Thrush Aircraft Inc.
- Models
- S-2R
- Type certificate
- A3SW
- On this site
- Thrush Aircraft Inc S-2 102 registered
- 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 20, 2026.