In The Works: Aviation Technology Group Javelin

 - January 23, 2007, 10:42 AM

ATG’s Javelin, a sporty contender in the VLJ market with its two engines and military-looking canted vertical stabilizers, will need the FAA to grant special conditions to achieve certification. The FAA is proposing special conditions that would become part of the Javelin’s type certification basis, due to the location of the airplane’s engines.

FAA Part 23 regulations under which the Javelin is being certified do not address the side-by-side mounting of the two turbofan engines in the aft fuselage, the FAA noted. Critical systems–including a 280-gallon fuel tank forward of the engines, the empennage, primary structure and flight control systems–are located near the engines. “The effects of a fire emanating from an enclosed engine installation are more varied, adverse, and more difficult to predict than an engine fire envisioned for typical Part 23 airplanes,” the FAA stated.

To mitigate any possibility of fire causing a problem with this configuration, the FAA is proposing that the fire-protection system be designed so that the two engines’ fire zones are completely separate and that they remain separate if a fire occurs. “Therefore,” the agency noted, “these special conditions mandate that the firewall required by Sec. 23.1191 be extended to provide firewall isolation between either engine. These special conditions require that heat radiating from a fire originating in any fire zone must not affect components, airframe structure, systems
or flight controls in adjacent compartments in a way that endangers the airplane.”

Comp Air Model 12 Expect to see the first flying Comp Air Model 12 single-engine composite high-wing retractable-gear turboprop at the Sun ’n’ Fun show from April 17 to 23 in Lakeland, Fla. “We’re hoping to make that date,” said a Comp Air spokesman. He doesn’t expect the first Model 12 to be painted and it won’t have a production interior. The carbon-fiber Model 12 will be powered by a Honeywell TPE331-14GR and will carry eight passengers and two pilots at 300 knots and be able to fly 2,535 nm, according to Comp Air specifications. Comp Air has joined the surge of airframers signing up for Honeywell’s Apex glass cockpit.

Comp Air plans to resume working on the high-wing fixed-gear Model 9 shortly after the Model 12’s first flight. A designer is working on molds for the Model 9, the spokesman said, and the first wing is done and the empennage is next on the list.

“We’ll apply for certification on the [Model 9] shortly after the Model 12’s [application],” he added. First flight of the Model 9 is tentatively scheduled for the third quarter, and Comp Air hopes to bring the airplane to the EAA AirVenture show in Oshkosh at the end of July.