ST01147CH-D
Installation of an AlliedSignal Mark VII Enhanced Ground Proximity Warning System (without Windshear). Held by Electrosonics, which holds 76 approved modifications in all. Last revised April 3, 2000. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company
- Models
- 550
- Type certificate
- A22CE
- On this site
- Cessna 550 Citation II 500 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 7, 2026.