Narrative:

Mr.X and I replaced the parking brake control cable on a crj-200 aircraft in june 2009 and completed the operational check and I signed it off in the logbook approximately early afternoon. I was reinstalling the clamps in the avionics bay and side panel; while mr.X was reconnecting the cable to the brake control in the forward panel. Then I went upstairs to perform the operational checks and he was downstairs making any required adjustments. The system checked good and I went down and reinstalled the panel I was working on and mr.X reinstalled the other panel. I failed to check behind him to ensure everything was installed. Mr. X called me later in the evening and asked if I had installed the nut and cotter pin; because he couldn't recall installing them and was hoping that I had. Then he said he was going to call the gate lead and let them know so that it could get inspected to see if it was installed. I was informed that mechanics were sent to the aircraft and found the parts missing and installed them. With both of us working on the installation I assumed mr.X had installed the parts after checking the rigging and apparently he thought I had installed them. There was no way to tell; while we were completing the operational checks; because the parking brake system would operationally check fine; with the hardware missing. I will have to check over the other mechanic's work after finishing a task; before signing it off.

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Original NASA ASRS Text

Title: A Mechanic reports he failed to check the work of another Mechanic who was helping him with the replacement of a CRJ-200 Parking Brake Control Cable prior to signing-off for the installation. The helping Mechanic called later with concerns the attaching nut and cotter key were not installed.

Narrative: Mr.X and I replaced the Parking Brake Control Cable on a CRJ-200 aircraft in June 2009 and completed the Operational Check and I signed it off in the Logbook approximately early afternoon. I was reinstalling the clamps in the Avionics bay and side panel; while Mr.X was reconnecting the cable to the Brake Control in the forward panel. Then I went upstairs to perform the Operational Checks and he was downstairs making any required adjustments. The system checked good and I went down and reinstalled the panel I was working on and Mr.X reinstalled the other panel. I failed to check behind him to ensure everything was installed. Mr. X called me later in the evening and asked if I had installed the nut and cotter pin; because he couldn't recall installing them and was hoping that I had. Then he said he was going to call the Gate Lead and let them know so that it could get Inspected to see if it was installed. I was informed that Mechanics were sent to the aircraft and found the parts missing and installed them. With both of us working on the installation I assumed Mr.X had installed the parts after checking the rigging and apparently he thought I had installed them. There was no way to tell; while we were completing the Operational Checks; because the Parking Brake system would operationally check fine; with the hardware missing. I will have to check over the other Mechanic's work after finishing a task; before signing it off.

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.