예전에 이스라엘이 미국 Aviation Technology Group (ATG)에서 개발중인 자벨린 고등훈련기 계획에 참여한다는 뉴스를 전해드린적이 있습니다. 이를 놓고서 T-50 수출은 물건너 갔다고 보는 관측들도 있었고 성능에 관한 논란도 있었는데요. 이스라엘이 자벨린 훈련기를 구매하는데 시큰둥한것 같습니다. 잠재력은 우수하지만 검증된 성능이 아니기때문이라는군요. 자벨린은 작년 9월에 첫비행을 했고 2008년에 인증을 받을 계획입니다. 민수용의 MK10을 비롯해서 사출좌석과 군사용 애비오닉스를 장착한 MK20, 엔진을 개조한 MK30까지 계획은 잡혀 있었지만 소요처도 불문명한 기종을 계속 개발할지는 의문이 드는군요. 군수용의 MK20은 FJ33-4 1,500 lb급 엔진 두발을 장착하고 엔진이 강화될 MK 30 가격이 600~800만 달러 수준이라고 합니다. 요즈음 대부분의 아음속 고등훈련기 추력이 5,000~6,000 lb에 1,500~2,000만 달러 수준의 가격이라는걸 감안하면 성능은 가장 떨어지지만 가격은 가장 싼 고등 훈련기가 됩니다.    " http://www.flightinternational.com/Articles/2006/01/24/Navigation/177/204245/Israeli+air+force+blunts+prospects+of+finding+Javelin+launch+customer.html " Israeli air force blunts prospects of finding Javelin launch customer The Israeli air force appears to have stepped back from becoming the possible launch customer for a military trainer version of the Javelin very light jet, citing the type’s lack of “proven experience” as a problem. “On paper the potential is excellent, but we don’t like to be the first customer for any aircraft,” says a senior service official. Israel Aircraft Industries (IAI) is teamed with the USA’s Aviation Technology Group (ATG) to develop and market two military variants of the Javelin, which made its first flight in the Mk10 civilian standard last September and is expected to receive certification during 2008 (Flight International, 11-17 October 2005). ATG and IAI plan to manufacture a Mk20 basic trainer version that will be identical in size to the civil-standard Javelin, but will be equipped with ejection seats and military avionics. To be manufactured in Israel by IAI, the Mk20 will be powered by two Williams International FJ33-4 engines with a thrust rating of around 1,500lb (6.7kN). To also be manufactured by IAI, a proposed Mk30 version would have more powerful engines, requiring the companies to redesign the aft fuselage section. To be offered as a replacement for lead-in trainers such as the Dassault/Dornier Alpha Jet, McDonnell Douglas TA-4 Skyhawk and Northrop T-38 Talon, the aircraft will have a unit cost of $6-8 million, according to IAI. The company had originally hoped to launch development of the Mk20 and Mk30 military versions this year, but it is unclear whether the Israeli air force’s reluctance to commit to the project could threaten this schedule.