ST01412WI
Installation of the Revue Thommen 2 Standby Altimeter. Held by Revue Thommen AG, which holds 3 approved modifications in all. Last revised October 30, 2006. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.
- Models
- 31, 31A, 35, 35A (C-21A), 36, 36A
- Type certificates
- A10CE, A10CE, A10CE, A10CE, A10CE, A10CE
- On this site
- Learjet 31 119 registered
Learjet 35 161 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.