Narrative:

Due to an error on my part; our flight returned to the gate unnecessarily. The flight was delayed. As the first officer I had transcribed the ATIS temperature incorrectly as +6 celsius instead of -6 celsius. I entered this incorrect data into ACARS and sent off for performance numbers. When the numbers came back we entered them into the mcdu. We taxied out and after the taxi checklist was started we saw an EICAS message of 'engine data no takeoff'. We set the brake and ran through the performance data; resent for numbers; but the EICAS message kept reappearing. The captain called maintenance who advised him to return to the gate. We taxied back to the gate. As we waited for maintenance I picked up the new ATIS and saw my error. I informed the captain that I had written down the wrong temperature and that the error was my fault. Maintenance showed up. We confessed. Captain voided the entry in the logbook; we got more fuel and departed.this could have been avoided several times. I knew that it was below freezing when I'd arrived the night before and yet I wrote down plus 6. I should have been slower and more deliberate while reading the digital ATIS. Although no one was deicing not only did I notice deicing trucks lurking about; but on my preflight; I saw that the horizontal stab was 2 degrees nose down. I'd also checked the wings for frost and informed the captain that the wings were clean.self-doubt goes a long way and I hope that this error will; in the future; linger with me; nagging me to be more vigilant.

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Original NASA ASRS Text

Title: EMB175 flight crew reported entering the incorrect temperature in the performance data; resulting in an EICAS message of 'engine data no takeoff'. After a return to the gate; the error was discovered.

Narrative: Due to an error on my part; our flight returned to the gate unnecessarily. The flight was delayed. As the First Officer I had transcribed the ATIS temperature incorrectly as +6 Celsius instead of -6 Celsius. I entered this incorrect data into ACARS and sent off for performance numbers. When the numbers came back we entered them into the MCDU. We taxied out and after the taxi checklist was started we saw an EICAS message of 'engine data no takeoff'. We set the brake and ran through the performance data; resent for numbers; but the EICAS message kept reappearing. The Captain called maintenance who advised him to return to the gate. We taxied back to the gate. As we waited for maintenance I picked up the new ATIS and saw my error. I informed the Captain that I had written down the wrong temperature and that the error was my fault. Maintenance showed up. We confessed. Captain voided the entry in the logbook; we got more fuel and departed.This could have been avoided several times. I knew that it was below freezing when I'd arrived the night before and yet I wrote down plus 6. I should have been slower and more deliberate while reading the digital ATIS. Although no one was deicing not only did I notice deicing trucks lurking about; but on my preflight; I saw that the horizontal stab was 2 degrees nose down. I'd also checked the wings for frost and informed the Captain that the wings were clean.Self-doubt goes a long way and I hope that this error will; in the future; linger with me; nagging me to be more vigilant.

Data retrieved from NASA's ASRS site 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.