Narrative:

The aircraft was released for service. The mechanic had found the collective bolt did not have a nut on the bolt. It had been looked at several times [and] was missed by several people. The next thing was the chin bubble had exited the aircraft. When looked at; there was no sealant holding the seal in. The instructions ask to do this. The oxygen system line was installed on the wrong valve. The lines were not tagged. If the lines were tagged this would not have happened.

Related reports:

Google
 

Original NASA ASRS Text

Title: Several maintenance discrepancies including an unsecured bolt on the top deck of a Bell 206 were missed during a final inspection. A Mechanic noticed the unsecured bolt after a check flight.

Narrative: The aircraft was released for service. The Mechanic had found the collective bolt did not have a nut on the bolt. It had been looked at several times [and] was missed by several people. The next thing was the chin bubble had exited the aircraft. When looked at; there was no sealant holding the seal in. The instructions ask to do this. The oxygen system line was installed on the wrong valve. The lines were not tagged. If the lines were tagged this would not have happened.

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.