SH4539NM
Establish a nine passenger seat configuration. Held by Air One Helicopters, INC, which holds 3 approved modifications in all. Last revised May 26, 1989. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation
- Models
- S-58FT, S-58HT, S-58ET, S-58DT, S-58BT, S-58JT
- Type certificates
- 1H11, 1H11, 1H11, 1H11, 1H11, 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 8, 2026.