STC ST01720LA-D
FAA DRS lists ST01720LA-D as Current · Reissued, held by Learjet Inc., for Learjet 31, Learjet 35, and Learjet 35A (C-21A), and 2 more aircraft configurations. Recorded change: Dual Honeywell MST-67A Diversity Transponders for Elementary and Enhanced Surveillance. Snapshot dated June 30, 2026.
Recorded modification
What the FAA record covers
ST01720LA-D 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 31, Learjet 35, and Learjet 35A (C-21A), and 2 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.
Related other aircraft modifications STCs
Installation of United Instruments encoding altimeter.
FAA holder: Mitsubishi Heavy Industries America Inc.
Installation of Gulton GB40 20 cell batteries or Marathon CA-5-20 cell batteries.
FAA holder: Mitsubishi Heavy Industries America Inc.
Installation of continuous ignition system.
FAA holder: Mitsubishi Heavy Industries America Inc.
Rewiring of auto-manual air conditioning switch.
FAA holder: Mitsubishi Heavy Industries America Inc.
FAA record reference
- STC number
- ST01720LA-D
- Product
- Aircraft · Large Multi-Engine
- Country
- United States
- Application date
- February 4, 2005
- Revision date
- December 23, 2015
- CFR references
- Part 21