SA7166SW-D
Installation of S-TEC System 60 single axis automatic flight guidance system Model ST-402. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised June 3, 1991. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- SOCATA - Groupe Aerospatiale; SOCATA - Groupe Aerospatiale; SOCATA - Groupe Aerospatiale
- Models
- TB20, TB21, TB10
- Type certificates
- A51EU, A51EU, A51EU
- On this site
- Daher (Socata) TB 10 53 registered
Daher (Socata) TB-20 200 registered
Daher (Socata) TB21 57 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.