Narrative:

A rolling takeoff was made. Aircraft X was very light -- 176600 pounds. Maximum power required due to cdl item. 116 KTS was V1 which was attained as power was still advancing. First officer called out we were only at 1.72 EPR, which should have been 1.78. By that time we were airborne. We discussed the issue with maintenance and dispatch. We suggested den since the aircraft would not be able to leave. We diverted to den where air carrier has our maintenance. Callback conversation with reporter revealed the following information: the reporter stated 'a rolling takeoff was made with the airplane lightly loaded and we reached V1, rotation and V2 prior to the left thrust lever reaching the target engine pressure ratio.' the reporter said the engines performed normally and maintenance was advised of the left engine EPR being below target. The reporter stated a decision was made to divert and have maintenance check out the engine. The reporter said the engine checked out ok during a high power run. The reporter stated a cdl item was deferred on the airplane which required full maximum power for takeoff. The reporter said one trailing edge flap fairing had been removed and placed on the cdl.

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Original NASA ASRS Text

Title: A B757-200 LIGHTLY LOADED ON A ROLLING TKOF REACHED V1 AND V2 PRIOR TO THE L ENG REACHING TARGET ENG PRESSURE RATIO. DIVERTED TO DEN FOR MAINT CHK.

Narrative: A ROLLING TKOF WAS MADE. ACFT X WAS VERY LIGHT -- 176600 LBS. MAX PWR REQUIRED DUE TO CDL ITEM. 116 KTS WAS V1 WHICH WAS ATTAINED AS PWR WAS STILL ADVANCING. FO CALLED OUT WE WERE ONLY AT 1.72 EPR, WHICH SHOULD HAVE BEEN 1.78. BY THAT TIME WE WERE AIRBORNE. WE DISCUSSED THE ISSUE WITH MAINT AND DISPATCH. WE SUGGESTED DEN SINCE THE ACFT WOULD NOT BE ABLE TO LEAVE. WE DIVERTED TO DEN WHERE ACR HAS OUR MAINT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED 'A ROLLING TKOF WAS MADE WITH THE AIRPLANE LIGHTLY LOADED AND WE REACHED V1, ROTATION AND V2 PRIOR TO THE L THRUST LEVER REACHING THE TARGET ENG PRESSURE RATIO.' THE RPTR SAID THE ENGS PERFORMED NORMALLY AND MAINT WAS ADVISED OF THE L ENG EPR BEING BELOW TARGET. THE RPTR STATED A DECISION WAS MADE TO DIVERT AND HAVE MAINT CHK OUT THE ENG. THE RPTR SAID THE ENG CHKED OUT OK DURING A HIGH PWR RUN. THE RPTR STATED A CDL ITEM WAS DEFERRED ON THE AIRPLANE WHICH REQUIRED FULL MAX PWR FOR TKOF. THE RPTR SAID ONE TRAILING EDGE FLAP FAIRING HAD BEEN REMOVED AND PLACED ON THE CDL.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.