SA09515AC-D
Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-895-20/30. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised December 19, 2001. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Helio Aircraft LLC; Helio Aircraft LLC; Helio Aircraft LLC; Helio Aircraft LLC; Helio Aircraft LLC; Helio Aircraft LLC; Helio Aircraft LLC
- Models
- H-250, H-295 (USAF U10D), H-395 (USAF L-28A or U-10B), H-395A, H-700, H-800, HT-295
- Type certificates
- 1A8, 1A8, 1A8, 1A8, 1A8, 1A8, 1A8
- On this site
- Helio Aircraft Ltd H800 6 registered
Helio H-250 11 registered
Helio H-295 54 registered
Helio H-395 17 registered
Helio HT-295 13 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.