SA66GL
Install Collins AP-106 autopilot consisting of Collins 913K-1 two each 334C-9 (662-0964-001, -002), 334C-6 (622-0965-002), 590A-6, 614E-1, 339T-1, 161H-1, 590B-3, and 390B-18 units. Held by Collins Radio Company, which holds 51 approved modifications in all. Last revised February 11, 1976. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Twin Commander Aircraft Corporation
- Models
- 500-S
- Type certificate
- 6A1
- 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.