SA09138AC-D
Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-620,. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised October 16, 2001. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Maule Aerospace Technology Inc.; Maule Aerospace Technology Inc.; Maule Aerospace Technology Inc.; Maule Aerospace Technology Inc.; Maule Aerospace Technology Inc.; Maule Aerospace Technology Inc.; Maule Aerospace Technology Inc.; Maule Aerospace Technology Inc.
- Models
- M-5-210C, M-5-235C, M-6-235, M-7-235, M-7-235A, M-7-235B, MX-7-180, MX-7-235
- Type certificates
- 3A23, 3A23, 3A23, 3A23, 3A23, 3A23, 3A23, 3A23
- On this site
- Maule M-5 364 registered
Maule M-6 81 registered
Maule M-7 275 registered
Maule MX-7 192 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.