SureFly

SureFly Partners, Ltd. develops, manufactures, sells and supports electronic ignition systems for piston aircraft engines, marketed as SureFly Ignition Modules (SIMs), from 350 Howard Clemmons Road, Granbury, Texas 76048. The company was founded in March 2015 by eight business partners who had previously worked with Sky-Tec starters and Plane-Power alternators. It sold its first experimental unit in August 2016, received its first FAA engine STC in October 2018 and its first airframe STC in February 2019, and says more than 10,000 SIMs are in service worldwide. The modules are hand-built in Granbury, largely from components made in Texas and Michigan.

Products

• SureFly Ignition Module: an FAA-certified solid-state replacement for one magneto, generally the left or impulse-coupled starting magneto, in 4-cylinder (SIM4P, SIM4N) and 6-cylinder (SIM6L, SIM6C) versions for Lycoming and Continental engines
• Dual SIM installations: the engine and airframe STCs have been amended to allow two SIMs on an engine, with guidance on powering the second module and on backup batteries
• Apex ignition harness, and an experimental product line

The site lists a 2,400-hour operating service time with no inspections, rebuilds or overhauls, variable timing advance on most fixed-wing single-engine aircraft for cruise efficiency, controlled timing at top dead centre below 400 rpm for starting, and a weight up to 2 lb lower than a Bendix magneto. SIMs require a Slick-style ignition harness. EASA and UK CAA STCs are available on the installation pages, and the company trains installation specialists. The home page lists four-cylinder units from $2,095 and six-cylinder units from $2,295 (rates change; confirm with the company).

Cirrus

SureFly's application guide (document SF2010), linked from the airframe installation page, lists Cirrus Design Corporation aircraft: the SR20 with the Continental IO-360 (SIM6C), the SR20 with the Lycoming IO-390 (SIM4P or SIM4N), the SR22 (SIM6C) and the SR22T (SIM6C), each with reference notes on configuration. The site's note that turbocharged aircraft and those operating above 10,000 ft should call SureFly about ignition harness selection applies to the SR22T.

Contact

Hours: Monday to Friday, 8:30 AM to 4:30 PM Central
Description from the company's website (October 2026). Not a Cirrus Aircraft authorized service center. Is this your company? Claim this page to add photos and keep your details up to date.