ST04393CH
Avionics upgrade installation of a Garmin GTN (TM) 750 Touchscreen Navigator interfaced to existing pilot side instruments and existing FC-200 or FC-530/-550 Autopilot and added GWX (TM) 70 Weather Radar. The Garmin GTN (TM) 750 GPS is paired with the added GTX (TM) 345R (or GTX 33/33D) Transponders for Automatic Broadcast Surveillance (ADS-B) OUT and ADS-B IN (GDL-88) capability with wireless download connectivity utilizing Garmin Connext®. Optional second Garmin GTN (TM) 650/750 interfaced to existing copilot side instruments only. Held by Royal Air INC., which holds 2 approved modifications in all. Last revised January 10, 2024. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.
- Models
- 35, 35A (C-21A), 36, 36A, 55, 55B, 55C
- Type certificates
- A10CE, A10CE, A10CE, A10CE, A10CE, A10CE, A10CE
- On this site
- Learjet 35 161 registered
Learjet 55 67 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 21, 2026.