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Aircraft connectivity

STC ST04393CH

FAA DRS lists ST04393CH as Current · Amended, held by Royal Air Inc., for Learjet 35, Learjet 35A (C-21A), and Learjet 36, and 4 more aircraft configurations. Recorded change: 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. Snapshot dated June 30, 2026.

FAA-listed holder
Royal Air Inc.
Aircraft configurations
7
FAA revision date
FAA status
Current · Amended

Recorded modification

What the FAA record covers

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.

ST04393CH identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.

Applicability

Aircraft named in FAA DRS

Named aircraft: Learjet 35, Learjet 35A (C-21A), and Learjet 36, and 4 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Learjet 35A10CELearjet 35A (C-21A)A10CELearjet 36A10CELearjet 36AA10CELearjet 55A10CELearjet 55BA10CELearjet 55CA10CE

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Learjet 35 and Learjet 35A (C-21A), and 5 more aircraft configurations model, serial range, and configuration?
  2. 02Which antenna, radome, LRUs, and service assumptions are included?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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