What was found
DURING FLIGHT, CREW REPORTED TCAS FAILED, FOLLOWED SHORTLY BY GPWS AND RADIO ALTIMETER FAILURE. SMOKE AND FUMES NOTED IN COCKPIT. DEACTIVATED TRANSPONDER, GPWS AND TCAS SYSTEMS AND SMOKE SUBSIDED. DIVERTED TO RJTY. FOUND RADIO ALTIMETER R/T UNIT FAILED AND PRODUCING SMOKE DUE TO SHORTED XMIT ANTENNA. REPLACED R/T UNIT AND XMIT ANTENNA. VISUALLY INSPECTED TCAS AND GPWS, NO DEFECTS NOTED. TCAS RTS IAW HN3443 AND GPWS CHECKED IAW HB3400.18. LP 11680, ITEM 1.