Narrative:

I took a radio call from a B757-200 aircraft advising he lost his left generator on takeoff roll and rejected takeoff (rejected takeoff) at approximately 60 KTS. Then the generator came back online during taxi and he asked if I would look and see if there is any history on the generator. I looked up the aircraft history and advised him there was none. I did ask him to do an [engine] run-up because I wanted to see if the generator would remain online during the run-up and then I could pass on the information to maintenance. I did tell him he could continue and I think this is where my miscommunication occurred. At this point I should have just told him to return to the gate since it was already an rejected takeoff. (When I said continue; I should have not used that verbiage because my intent was for him to return to gate; and then continue on after maintenance was performed or the generator placed on MEL. (I should not have assumed he would have known to go back to gate; and I may have given the impression to continue on flight.) I did call the maintenance tower and asked if he was aware the flight was returning and he said 'yes'; that it was assigned a gate on 'B' gates; leading me to understand the flight just returned to the gate.line maintenance called to obtain dispatch approval on the generator (gen) MEL which was granted. I then was asked by the maintenance control shift manager if the flight did a second rejected take off due to [his] hearing the [pilot] did; I told him not to my knowledge. When the log sheets came across; I noticed the crew write-up stated: 'left gen drive message comes on during T/O roll at approximately 70-74 KTS - occurred twice- 2 rejected T/os'. At that time; I advised maintenance control shift manager the crew did state in logbook write-up there was a second rejected takeoff.

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Original NASA ASRS Text

Title: A Maintenance Controller describes how mis-communications between he and a B757-200 pilot contributed to the pilot attempting another takeoff that ended with a second RTO for the same Left Engine Generator failure. Aircraft returned to gate and Maintenance replaced the Bus Power Control Unit (BPCU).

Narrative: I took a radio call from a B757-200 aircraft advising he lost his Left Generator on takeoff roll and Rejected Takeoff (RTO) at approximately 60 KTS. Then the generator came back online during taxi and he asked if I would look and see if there is any history on the generator. I looked up the aircraft history and advised him there was none. I did ask him to do an [Engine] Run-up because I wanted to see if the generator would remain online during the Run-up and then I could pass on the information to Maintenance. I did tell him he could continue and I think this is where my miscommunication occurred. At this point I should have just told him to return to the gate since it was already an RTO. (When I said continue; I should have not used that verbiage because my intent was for him to return to gate; and then continue on after Maintenance was performed or the generator placed on MEL. (I should not have assumed he would have known to go back to gate; and I may have given the impression to continue on flight.) I did call the Maintenance Tower and asked if he was aware the flight was returning and he said 'yes'; that it was assigned a gate on 'B' Gates; leading me to understand the flight just returned to the gate.Line Maintenance called to obtain Dispatch approval on the Generator (Gen) MEL which was granted. I then was asked by the Maintenance Control Shift Manager if the flight did a second Rejected Take Off due to [his] hearing the [pilot] did; I told him not to my knowledge. When the log sheets came across; I noticed the crew write-up stated: 'L GEN DRIVE MSG COMES ON DURING T/O ROLL AT APPROX 70-74 KTS - OCCURRED TWICE- 2 REJECTED T/Os'. At that time; I advised Maintenance Control Shift Manager the crew did state in logbook write-up there was a second Rejected Takeoff.

Data retrieved from NASA's ASRS site as of July 2013 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.