SH661GL
Reduction of passenger seat con- figuration from 16 to 9 passenger seats by removing the two-man seat(P/N 1650-61339) and the five-man seat (P/N 1607-5096-1). Held by Air 76 INC. Last revised February 9, 1983. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Sikorsky Aircraft Corporation
- Models
- S-58HT
- Type certificate
- 1H11
- On this site
- Sikorsky S-58 25 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 22, 2026.