SA93EA
Installation of Monitair angle of attack system, Model AA-2. Held by Rosemount Engineering CO, which holds 14 approved modifications in all. Last revised February 14, 1972. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company
- Models
- 172, 172A, 172B, 172D, 172C, 170B
- Type certificates
- 3A12, 3A12, 3A12, 3A12, 3A12, A-799
- On this site
- Cessna 170 2,085 registered
Cessna 172 Skyhawk 20,670 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 8, 2026.