A B727 PIC; WHILE PARKED; HAD THE SO START THE APU UNAWARE MAINT WAS WORKING IN OR NEAR THE UNIT. TECHNICIAN INCURRED AN EYE INJURY.

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UPON ARR FROM HOTEL TO COMPANY FACILITY AT ZZZ; CAPT AND I PROCEEDED TO THE ACFT. I PERFORMED MY EXTERIOR SAFETY CHK AND THE CAPT WENT UP TO THE FLT DECK TO STOW HIS BELONGINGS. AFTER COMPLETION OF MY EXTERIOR SAFETY CHK; I WENT TO THE FLT DECK TO CONTINUE PREFLT DUTIES. AFTER COMPLETING THE CHKLIST; THROUGH THE STANDBY PWR CHK; I ADVISED THE MECH THAT I WAS GOING TO START THE APU TO COOL THE FLT DECK. AFTER STARTING AND THEN XFERRING ACFT PWR TO THE APU; A MECH CAME INTO THE FLT DECK; CLOSED THE ACFT BLEED AIR SWITCHES; AND ASKED WHO HAD STARTED THE APU. I STATED THAT I WAS UNAWARE OF ANYTHING WRONG WITH THE ACFT; LET ALONE ANYONE WORKING ON IT. THE FLT DECK HAD NO PLACARDS STATING NOT TO OPERATE ANY ACFT SYS AT THE TIME OF THE INCIDENT. AFTER THE APU WAS SHUT DOWN; I WENT TO DISCUSS THE SIT WITH THE CAPT UNAWARE OF ANYONE BEING INJURED. AT THIS POINT I LEARNED THAT A MECH HAD RECEIVED AN EYE INJURY. AFTER RETURNING TO THE ACFT; SOMEONE HAD PLACED A PIECE OF PAPER OVER THE APU CTL PANEL THAT READ 'NO APU.' I BELIEVE A NUMBER OF EVENTS LEADING UP TO THIS INCIDENT OCCURRED STARTING WITH THE FOLLOWING: NO MAINT PERSONNEL RELAYED STATUS OF THE ACFT WITH ANY OF THE FLC. DISPATCH ALSO FAILED TO NOTIFY FLC OF ACFT STATUS AS WELL AS NOTIFYING US ANOTHER ACFT HAD BEEN DISPATCHED. FAILURE TO SEE ANYONE WORKING ON ACFT. FAILURE OF MECH IN FLT DECK TO STOP APU FROM BEING USED AFTER BEING ADVISED IT WAS BEING STARTED. FINALLY; ABSENCE OF ANY PLACARDS STATING THAT ACFT WAS AND/OR IF ANY ACFT SYS WERE NOT TO BE OPERATED. I BELIEVE BETTER COMS FROM ALL PARTIES INVOLVED AS WELL AS PLACEMENT OF ADVISORY PLACARDS OVER AFFECTED ACFT EQUIP COULD HAVE PREVENTED THIS UNFORTUNATE INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT UNKNOWN TO ANYONE A TECHNICIAN WAS REPLACING THE #3 ENG START VALVE WITH THE START VALVE DUCT OPENED. THE RPTR SAID WHEN THE PREFLT WALKAROUND CHK WAS MADE A VEHICLE WAS PARKED UNDER #3 ENG BUT THE COWLING WAS CLOSED AND NO MAINT TECHNICIANS WERE IN VIEW. THE RPTR STATED NO PLACARDS WERE ON THE APU OR PNEUMATIC SWITCHES AND NO CIRCUIT BREAKERS WERE PULLED. THE RPTR STATED THE TECHNICIAN RECEIVED A BURN TO THE EYE AND WAS OFF SEVERAL DAYS BEFORE RETURNING TO WORK. THE RPTR SAID THIS MAINT STATION WAS ALWAYS INDIFFERENT TO SAFETY PROCS AND BELIEVES MGMNT IS AT FAULT.