UNAUTH TAXI.

Narrative

WHILE TAXIING FOR TKOF AT LGA WE WERE UNABLE TO GET A START VALVE LIGHT ON #3 ENG. AFTER TALKING TO MAINT VIA RADIO WE RETURNED TO THE HANGAR LINE. A MECH PLUGGED INTO INTERPHONE TO BLOCK US IN AND DETERMINE OUR PROB. HE THEN UNPLUGGED. THE NEXT COM I HEARD WAS ON THE FO OVERHEAD SPEAKER. IT WAS A MECH ADVISING TO START #3 ENG AND THAT IF IT DID NOT START WE WOULD TAXI TO A GATE TO CHANGE THE STARTER. THE START VALVE LIGHT DID NOT ILLUMINATE. A MECH THEN DROVE FROM BEHIND THE AIRPLANE TO A POINT OF THE NOSE. WE COULD SEE HE WAS SPEAKING INTO HIS RADIO. ON OUR RADIO WE WERE BEING TOLD TO START #1 ENG AND #2 AND FIND OURSELVES A GATE. THE TRUCK THEN DROVE OUT OF OUR WAY. AFTER RAMP CTL CLRED US TO GATE WE BEGAN TO TAXI. AFTER ABOUT 50 FT THE TRUCK DROVE IN FRONT OF US. THE MECH JUMPED OUT AND GAVE US AN IMMEDIATE STOP SIGNAL. AFTER WE STOPPED; THE MECH PLUGGED IN AND TOLD US THAT WE HAD TAXIED WITH THE #3 ENG COWL OPEN; A STAND UNDER THE ENG AND 2 MECHS ON THE STAND. NO ONE WAS INJURED. NO PROPERTY WAS DAMAGED. SINCE NORMAL COMS WERE NOT USED; THE MECH IN THE TRUCK; CLRING US TO START ENGS #1 AND #2 FIND A GATE THEN DRIVING OUT OF OUR WAY WAS INTERPRETED AS HIS CLRING US TO TAXI.