A MEDIUM TURBOPROP TRANSPORT WAS DISPATCHED IN NON COMPLIANCE WITHOUT THE LOGBOOK BOARDED AFTER MAINT WAS PERFORMED.

Narrative

ON DSCNT INTO ZZZ FROM ZZZ1; THE R ENG WOULD NOT REDUCE RPM BELOW 81% N2 WITH THE THROTTLE AT IDLE; ALL OTHER ENG GAUGES WERE SIMILARLY HIGH. WITH THIS HIGH THRUST SETTING; THE ACFT WAS CHALLENGING TO DSND WITHOUT GAINING AIRSPD. SEVERAL ATTEMPTS WERE MADE TO REDUCE THRUST ON R (CHANGE BLEEDS; THROTTLE BURST; ETC) WITH NO SUCCESS. UNEVENTFUL LONG STRAIGHT IN FLOWN TO UNEVENTFUL LNDG. NO EMER WAS DECLARED; BUT A FIRE TRUCK WAS REQUESTED TO FOLLOW US TO THE RAMP IN THE EVENT OF HOT BRAKES. THE CREW PERFORMED 2 ENG GND RUNS FOR MAINT TO INVESTIGATE THE PROB. THE INFLT CONDITION COULD NOT BE DUPLICATED; AND THE ACFT WAS RELEASED FOR FLT. DURING THE GND RUNS AND OTHER MAINT PROCS AND PHONE CALLS BTWN THE ZZZ MECH AND ZZZ1 MAINT CTL; THE ACFT LOGBOOK LEFT AND RETURNED TO THE ACFT AT LEAST 4 TIMES. WHEN THE FLT FINALLY LEFT FOR ZZZ1; THE LOGBOOK WAS LEFT IN THE OPS OFFICE. THE CREW DISCOVERED THE OVERSIGHT; AND WITH THE HELP OF AN EXCEPTIONAL ZZZ AGENT; WHO WAS GOING OFF DUTY; THE MAINT LOGBOOK WAS HAND DELIVERED TO THE CREW IN ZZZ1 ON THE NEXT FLT. THE BOOK WAS ONLY 15 MINS LATE FOR DELIVERY TO THE LINE MAINT OFFICE. THE ACFT WAS TAKEN OTS; BECAUSE ON THE RETURN FLT INTO ZZZ; THE R ENG EXACTLY DUPLICATED THE PREVIOUS HIGH IDLE PROB. ANOTHER PRECAUTIONARY LNDG WAS MADE WITHOUT INCIDENT. AN EMER WAS NOT DECLARED; BUT ONCE AGAIN; A FIRE TRUCK FOLLOWED THE ACFT TO THE GATE IN CASE THE BRAKES GOT WARM.