ST00255LA
Installation of Allied Signal (Sundstrand MK VI) Ground Proximity Warning System (GPWS). Held by Cessna Aircraft Company, which holds 12 approved modifications in all. Last revised October 11, 1996. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company; The Cessna Aircraft Company
- Models
- 501, 551
- Type certificates
- A27CE, A27CE
- On this site
- Cessna 501 Citation I/SP 189 registered
Cessna 551 34 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 5, 2026.