Mobile Automatic Radiation Tester (MART CART): After the aircraft is delivered to flight test, all navigational and communications gear is checked. This includes IFF, ILS, ADF, Data Link, TACAN, and UHF. All are checked under flight line operating conditions. The Mart Cart eliminates the need of portable testers assigned to each aircraft. SM-ALC, McClellan AFB, CA. Depot PDM MODs.