AN ACR LTT ABORTED ITS TKOF DUE TO LOW PWR ON 1 ENG.

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ON TKOF; R ENG ONLY DEVELOPED 20 PERCENT PWR AND EGT WAS RISING. I ABORTED AND SHUT DOWN THE ENG. MAINT FOUND AN AIR INLET PLUG AT BOTTOM OF INLET. I KNEW THE ACFT HAD REMAINED OVERNIGHT AND I DID AN ESPECIALLY THOROUGH WALK AROUND. I DID NOT SEE AN INLET PLUG OR A RED FLAG ON THAT ENG. THE MECH HAD INSTALLED THE PLUG INCORRECTLY. I BELIEVE THAT IF MAINT PERSONNEL INSTALL RON KITS THEY SHOULD ALSO REMOVE THEM THE NEXT DAY USING SOME SORT OF INVENTORY SYS TO BE CERTAIN THAT ALL ITEMS ARE ACCOUNTED FOR. THIS WOULD ADD ANOTHER SAFETY IN ADDITION TO THE FO'S PREFLT INSPECTION AND A CAPT'S WALK AROUND. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: THE RPTING FO STATES THAT HIS COMPANY UNDERSTOOD THE PREDICAMENT THAT HE WAS IN AND WAS NOT VERY HARSH WITH HIM. THE 'REMAIN OVER NIGHT' KITS ARE CARRIED IN THE ACFT AND HAVE BEEN UPGRADED SO THAT THEY ARE IN MUCH BETTER CONDITION. GND PERSONNEL HAVE BEEN INSTRUCTED IN THE IMPORTANCE OF INSTALLING THE RON KITS PROPERLY AND IN REMOVING THEM PRIOR TO FLT AND THEIR PROPER MAINT. SUPPLEMENTAL INFORMATION FROM ACN 253056: THE INLET PLUG HAD BEEN INSTALLED IMPROPERLY WITH THE WARNING FLAG TUCKED UNDERNEATH AND NOT SHOWING AND THE PLUG ITSELF NOT PROPERLY POSITIONED TO COVER THE OPENING. THE PLUG WAS ALSO PUSHED WAY BACK INTO THE INTAKE MAKING IT EVEN LESS VISIBLE WITH THE GIVEN CONDITIONS/LIGHT. THIRD; MANY OF OUR RON (REMAIN OVERNIGHT) KITS ARE INCOMPLETE; MISSING INLET; OUTLET COVERS; ETC; THUS WHEN YOU'RE MISSING A PIECE OF THE KIT WHEN PUTTING IT AWAY/PULLING IT OFF; YOU TAKE IT FOR GRANTED THAT THE 'MISSING ITEM' WAS NOT WITH THE KIT TO BEGIN WITH. ALSO; MANY OF THE KIT COMPONENTS ARE IN POOR SHAPE; MISSING STUFFING; FLAGS; ETC.