Narrative:

The mechanics did not want to deal with looking at the real write up. They assumed that the pilots had made an error and changed the write up with out confirming anything. I contacted the captain who wrote up the pack; he confirmed he wrote up the right pack.line mechanic was called to aircraft with the right hand air conditioning pack written up due to an over pressure. The right hand pack was producing minimal airflow when the mechanic arrived. The left pack had quit working; prior to the mechanic showing up and had not been written up yet. The mechanic felt the previous captain meant to write up the left pack and made a mistake. The mechanic proceeded to alter the right hand pack write up to reflect the left hand pack being broken. Maintenance control then proceeded to MEL the left hand pack. When asked what was being done with right pack the mechanic said; 'nothing'; it was the left pack that was bad. I asked for the right pack to be addressed. The mechanics then said fine; we will ops check it. They started the right engine only at the gate; running it up to 80%; recycled the packs 3 times and said everything was fine. The aircraft was then signed off with the original write up re-adjusted to reflect the right pack write-up; ops check good. The left pack was written up and then MEL'ed. We departed; received the high pressure fault with a psi of 93 on the right hand pack right after takeoff.changing of the maintenance log right in front of me. Contact the chief pilot.investigate each write up as valid. If in question; contact person writing up plane; to confirm their write up.

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Original NASA ASRS Text

Title: A Captain of an outbound CRJ-200; reports mechanics had altered the previous inbound Captain's right air conditioning pack write up to reflect the left pack being broken. Subsequent departure resulted in a return to the field; after the right pack overpressured.

Narrative: The mechanics did not want to deal with looking at the real write up. They assumed that the pilots had made an error and changed the write up with out confirming anything. I contacted the Captain who wrote up the pack; he confirmed he wrote up the right pack.Line Mechanic was called to aircraft with the right hand air conditioning pack written up due to an over pressure. The right hand pack was producing minimal airflow when the Mechanic arrived. The left pack had quit working; prior to the Mechanic showing up and had not been written up yet. The Mechanic felt the previous Captain meant to write up the left pack and made a mistake. The Mechanic proceeded to alter the right hand pack write up to reflect the left hand pack being broken. Maintenance Control then proceeded to MEL the left hand pack. When asked what was being done with right pack the Mechanic said; 'nothing'; it was the left pack that was bad. I asked for the right pack to be addressed. The Mechanics then said fine; we will ops check it. They started the right engine only at the gate; running it up to 80%; recycled the packs 3 times and said everything was fine. The aircraft was then signed off with the original write up re-adjusted to reflect the right pack write-up; ops check good. The left pack was written up and then MEL'ed. We departed; received the high pressure fault with a PSI of 93 on the right hand pack right after takeoff.Changing of the Maintenance Log right in front of me. Contact the chief pilot.Investigate each write up as valid. If in question; contact person writing up plane; to confirm their write up.

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.