A KING AIR 100 DURING A SCHEDULED PHASE CHK HAD A CONTRACT INSPECTOR INADVERTENTLY SIGN OFF INSPECTION ITEMS NOT INSPECTED.

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I AM EMPLOYED BY FBO LOCATED ON ZZZ; US; ARPT. WXV (A MEDICAL EVAC COMPANY OWNED BY XXX) WAS AND IS SHORT OF MAINT HELP. WXV CONTACTED MY COMPANY ON MAY/FRI/00 TO SEE IF WE COULD DO A 'LUBRICATION INSPECTION' ON ONE OF THEIR KING AIR ACFT. WE DID THE WORK AT OUR LOCATION COMPLETING THE WORK AT XA00 MAY/SAT/00. ON MAY/SUN/00 WXV; STILL BEHIND ON THEIR MAINT; CALLED AND ASKED IF WE COULD SEND A MECH TO THEIR LOCATION (WHICH IS ALSO ON ZZZ ARPT) TO ASSIST IN A PHASE INSPECTION OF ANOTHER KING AIR. I WAS SENT TO THEIR LOCATION ON MAY/MON/00 AT XA00. I INTRODUCED MYSELF TO A MECH WORKING BY THE ACFT IN PHASE INSPECTION. HE STATED THAT HE WAS NOT FAMILIAR WITH THIS ACFT. I TOLD HIM THAT I HAD NO EXPERIENCE ON THESE ACFT MYSELF. HE SAID THAT WE COULD JUST FOLLOW THE CHKLIST AND THE SVC MANUALS WHICH WERE AVAILABLE. I WORKED ALONE; FOLLOWING THE CHKLIST AND MANUALS. I WAS ASKED TO GO TO ANOTHER ACFT AND HELP. I DID SO FOR ABOUT 2 HRS. I THEN RETURNED TO PHASE INSPECTION. AT THE END OF THE SHIFT; KNOWING THAT OTHER WXV MECHS WOULD BE IN THE NEXT DAY (MAY/TUE/00) TO FINISH THE INSPECTION. I INITIALED THE CHECKLIST AND THE ITEMS I COMPLETED. I INADVERTENTLY INITIALED SOME BLOCKS WHICH WERE NOT INSPECTED. THE MECH WHO CAME IN THE NEXT DAY FOUND THEM AND INSPECTED THE AREAS I HAD INITIALED. NO PROBS WERE NOTED AND THE ACFT WAS COMPLETE AND SIGNED OFF BY WXV MAINT.