SA2575WE
Installation of observer station in rear seat-baggage compartment area, searchlight and dual speakers in bottom of aft fuselage, windows in baggage compartment area (baggage was removed), and a muffler. (172M NORMAL CATEGORY LANDPLANE ONLY). Held by World Associates, INC. Last revised January 4, 1973. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company; The Cessna Aircraft Company
- Models
- 172K, 172M
- Type certificates
- 3A12, 3A12
- On this site
- Cessna 172 Skyhawk 20,676 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.