SA09635AC
Installation of S-TEC Meggitt Engine Instrument Display System (EIDS) in accordance with Master Data List 921230, Revision 7, dated September 17, 2004, or later FAA approved revision for Cessna 425. FAA approved Airplane Flight Manual Supplement No. 892137, dated September 20, 2004, or later FAA approved revision is required for Cessna 425 with S-TEC Meggitt EIDS. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised September 20, 2004. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company
- Models
- 421C
- Type certificate
- A7CE
- On this site
- Cessna 421 Golden Eagle 770 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.