Thornton Aviation Completes Collins Pro Line Fusion Flight Deck Upgrade on Bombardier Challenger 604
Why It MattersAvionics retrofits let older business jets gain modern navigation and approach capability without a new-aircraft purchase, extending the operating life of legacy fleets like the Challenger 604.
What happened
Thornton Aviation has completed a flight deck upgrade on a Bombardier Challenger 604, replacing the aircraft's original CRT displays with Collins Aerospace Pro Line Fusion avionics as part of a scheduled maintenance package.
The upgrade installs three 14.1-inch touchscreen LCD displays with configurable window layouts in place of the legacy CRT units. Added capabilities include LPV approaches, synthetic vision, and georeferenced navigation charts designed to support eyes-forward flight planning. FANS and Link 2000 connectivity are available as optional features.
Thornton chief revenue officer Don Milum said the project was completed ahead of schedule and within budget. "While we strive to deliver every job on time and on budget, as promised, the team knocked it out of the park again by completing this project well ahead of schedule while meeting the budget," Milum said. Thornton Aviation holds FAA Part 145 repair station approval covering more than 60 aircraft types.
Industry impact & what to watch
This upgrade fits the broader pattern of MRO providers extending the useful life of aging business jet fleets by swapping legacy CRT flight decks for modern touchscreen avionics suites. For operators of older Challenger 604s, a Pro Line Fusion retrofit adds capabilities like LPV approaches and synthetic vision that were unavailable when the aircraft was built, potentially keeping the airframe relevant for owners weighing a retrofit against a newer purchase.
The repair-station segment competes partly on execution reliability — delivering on schedule and on budget matters to owners deciding whether to sink a scheduled maintenance window into a larger avionics project rather than a routine check. Thornton's Part 145 approval spanning more than 60 aircraft types signals the kind of breadth that lets a single shop capture this work across different fleet types rather than losing it to type-specific specialists.
Whether this particular upgrade becomes a template depends on whether other Challenger 604 operators follow with similar retrofits, and on how FANS and Link 2000 connectivity get adopted once offered as options rather than standard equipment.
