SH591GL
Install structural provisions for cabinmounted electronic news gathering equipment (TV monitor/ receiver, audio/video switching, AM headset control box, UHF FM control head, associated switches and circuit breakers) not to exceed 30 lbs., baggage-box- mounted UHF/VHF transmitters/receivers not to exceed 20 lbs., and wiring harness. Held by Airborne Microwave, INC, which holds 2 approved modifications in all. Last revised February 12, 1982. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Enstrom Helicopter Corporation
- Models
- F-28F
- Type certificate
- H1CE
- On this site
- Enstrom F-28 147 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 21, 2026.