MD80 CREW HAD LOW ENG PWR FOR TKOF.

Narrative

FLT (ATL-ORD) ON OCT/XA/99; SHIP #XX; PUSHED BACK FROM GATE AT XA25L FOR AN XA42L DEP. STATED BOTH ENGS AND TAXIED TO RWY 8R AT ATLANTA HARTSFIELD ARPT. TKOF GROSS WT WAS 140100 LBS. CLB PERFORMANCE WT LIMIT WAS 150600 LBS AND RWY ALLOWABLE WT LIMIT WAS 144800 LBS. WE SET UP FOR A REDUCED THRUST (AT 35) FLAPS 11 DEGS TKOF. OUR DEP WAS DELAYED UNTIL XA51L SO WE HELD SHORT OF THE RWY WITH BOTH ENGS RUNNING. THE OUTSIDE TEMP WAS 16 DEGS C SO NO ENG ANTI-ICE WAS USED. AT XA51L WE WERE CLRED ON THE RWY (8R) FOR TKOF. THE CAPT WAS FLYING SO HE INITIATED A ROLLING TKOF. PER PROC; HE ADVANCED THE THROTTLES TO 1.4 EPR AND CALLED FOR AUTOTHROTTLES TO BE ENGAGED. I ENGAGED THE THROTTLES AND WATCHED THE ENGS AS THEY ADVANCED TO TKOF PWR. AT 80 KTS I NOTICED #1 ENG ONLY ADVANCED TO 90% N1; WHILE #2 ENG WAS AT 93-94% N1. I LOOKED AT THE EPR GAUGES AND SAW THAT THE #1 ENG WAS NOT AT FULL COMPUTED TKOF THRUST (ABOUT .04 BELOW THE BUGGED LIMIT. I TOLD THE CAPT TO PUSH IT UP (ALL OTHER INDICATIONS WERE WITHIN LIMITS AND NO WARNING LIGHTS). HE SLOWLY ADVANCED THE THROTTLE (DURING THIS TIME WE WERE CONTINUING TO ACCELERATE). HE ADVANCED THE THROTTLE FULLY WITH NO EFFECT. BY NOW WE WERE AT APPROX 120 KTS (V1 WAS 132; VR 143; V2 151). BECAUSE OF OUR SPD; OUR HVY WT; AND THE RWY BEING WET; HE ELECTED TO CONTINUE THE TKOF. WE LIFTED OFF AND CLBED NORMALLY TO 5000 FT MSL. THE CAPT RETARDED AND ADVANCED THE L THROTTLE (AFTER WE APPLIED ENG ANTI-ICE TO BOTH ENGS) AND IT RESPONDED SLUGGISHLY; WE ELECTED TO RETURN TO ATLANTA AND PERFORMED AN UNEVENTFUL FLAPS 28 DEG LNDG. ON THE GND; THE ENG WAS SHUT DOWN AND THE ACFT TURNED OVER TO MAINT. WE SWITCHED ACFT AND CONTINUED OUR FLT. WHILE A REJECTED TKOF WAS AN OPTION (WE WERE 10-15 KTS BELOW V1); I FEEL THE CAPT'S DECISION WAS THE CORRECT ONE; BASED ON OUR SIT (HVY WT; WET RWY; HIGH SPD; 1 ENG PERFORMING NORMALLY AND THE OTHER PUTTING OUT 80-90% OF NORMAL THRUST). SUPPLEMENTAL INFO FROM ACN 451906: THROTTLES ADVANCED FOR TKOF; L ENG WAS SLOW COMPARED TO R ENG. STABILIZED THROTTLE MOVEMENT UNTIL L ENG MATCHED R EPR ABOVE 1.4 AUTOTHROTTLE SELECTED. TKOF WAS FLEX PWR (REDUCED) AT 35 KTS. AT 80 KTS FO NOTED L N1 90%; R N1 93%. ADVANCED L THROTTLE TO MATCH R AND RECEIVED NO RESPONSE. TKOF CONTINUED; DUE TO AIRSPD ABOVE 100 KTS. V1 WAS 138 KTS. AFTER TKOF CLB PWR WAS SELECTED; DURING CLEAN UP; AND PWR SEEMED TO MATCH. PLAN WAS TO LEVEL OFF AT INTERMEDIATE ALT; CONTACT COMPANY; AND COMPLETE REQUIRED CHKLIST FOR RETURN TO ATLANTA. L ENG RESPONDED EXTREMELY SLOWLY TO THROTTLE MOVEMENT AFTER LEVELOFF AT 5000 FT MSL. ACFT WAS ON DOWNWIND; AN EMER WAS DECLARED; DSCNT AND APCH CHKLIST ACCOMPLISHED AND APCH CTL EXPEDITED A RECOVERY TO ATL RWY 8L. SINGLE ENG PROCS WERE UTILIZED WITH L ENG AT IDLE PWR. L ENG WAS SHUT DOWN AFTER LNDG. NO EXCEEDANCE WAS OBSERVED ENTIRE FLT AND L ENG NEVER DECAYED BELOW IDLE PWR.