Narrative:

During preflight planning we noticed the left air conditioning pack had six gripes within the last six days for tripping off. Several of them were during the low speed portion of the takeoff roll. Maintenance didn't seem to be able to solve the problem as this item had much history. The first officer and I discussed turning off the left pack for takeoff since we didn't want to abort for the same reason. We briefed and planned on this. On the takeoff roll; around 60-70 KTS; we aborted the takeoff for an EICAS that indicated left bleed (not pack) off. We exited the runway; verified that the brakes were not an issued and talked to maintenance and dispatch. We wrote up the left bleed off EICAS and the aborted takeoff. As we worked through this issue we noticed in the additional procedure that the associated bleed may trip off if the pack is off. Maintenance concurred with this as we didn't have any other bleed lights indicating. Both maintenance and dispatch concurred that we could attempt another takeoff. Maintenance also concurred that the brakes were not an issue due to the abort (low speed regime). Maintenance issued us a new maintenance release and dispatch released us on release 2 with the fuel onboard. We made a successful takeoff on the second attempt with both the packs and bleeds on. The next time I have an issue such as this; I will talk to maintenance before we turn off a pack. Also a review of the additional procedure; prior to takeoff; would have been a good idea.

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Original NASA ASRS Text

Title: A B757 crew turned the left pack off in order to avoid a nuisance trip and got a BLEED OFF EICAS so they aborted. Maintenance said the EICAS was normal for a pack off takeoff condition so they departed with no problems.

Narrative: During preflight planning we noticed the left air conditioning pack had six gripes within the last six days for tripping off. Several of them were during the low speed portion of the takeoff roll. Maintenance didn't seem to be able to solve the problem as this item had much history. The First Officer and I discussed turning off the left pack for takeoff since we didn't want to abort for the same reason. We briefed and planned on this. On the takeoff roll; around 60-70 KTS; we aborted the takeoff for an EICAS that indicated left bleed (not pack) off. We exited the runway; verified that the brakes were not an issued and talked to maintenance and dispatch. We wrote up the Left Bleed OFF EICAS and the aborted takeoff. As we worked through this issue we noticed in the additional procedure that the associated bleed may trip off if the pack is off. Maintenance concurred with this as we didn't have any other bleed lights indicating. Both Maintenance and Dispatch concurred that we could attempt another takeoff. Maintenance also concurred that the brakes were not an issue due to the abort (low speed regime). Maintenance issued us a new maintenance release and Dispatch released us on Release 2 with the fuel onboard. We made a successful takeoff on the second attempt with both the packs and bleeds on. The next time I have an issue such as this; I will talk to Maintenance before we turn off a pack. Also a review of the additional procedure; prior to takeoff; would have been a good idea.

Data retrieved from NASA's ASRS site as of April 2012 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.