EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP)
Distraction; Situational Awareness; Confusion
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action; Flight Crew Rejected Takeoff; Flight Crew Returned To Gate; General Release Refused / Aircraft Not Accepted
Aircraft
After completing all the necessary checks and receiving our takeoff clearance from Tower; we made an attempt to takeoff of Runway 32R at the intersection. At the 80 KTS crosscheck call we were about halfway down the runway and the aircraft was struggling to accelerate. It took a further significant amount of runway to reach V1 and just prior to that both the First Officer and I had made comments during the takeoff roll that the aircraft did not feel it had the necessary performance to keep going. At 125 KTS and what appeared to be more than 3/4 down the runway I made the decision to abort. My perception was that the aircraft was not making enough thrust to continue into the air safely. Did have a slight hesitation at V1 to abort; and started the abort at about 128-130 KTS. The threat was that even though the 'takeoff' thrust was selected; the thrust lever request was matching the target indicated on the EICAS; the aircraft did not accelerate normally. After the gate return we switched aircraft and completed that flight. After taking off; both myself and the First Officer made a point to discuss that the different aircraft accelerated normally and had a significant performance improvement over the previous. Also worth noting was that the weather conditions were very similar in both circumstances.I am not sure how to prevent this in the future as it appears now to have been a failure of one specific aircraft and not necessarily an issue with all of the aircraft or how we operate them.
Around 80 KTS the Captain and I noticed that the prescribed N1 setting seemed rather low (81.5%). A few knots prior to rotation; the Captain aborted the takeoff and said that the aircraft was not accelerating the way it should.
An EMB-145 Captain rejected the takeoff at about 128 KTS because the aircraft was not accelerating normally and at 81.5% N1; the thrust felt too low.