Incident
After landing, while taxiing, the number one engine constant speed drive (CSD) caught fire. The aircraft was dispatched with the engine closed up following maintenance performed by second and third shift mechanics.
Background
The flight crew had disconnected the number one engine CSD during a flight on the day prior to the incident when its oil pressure light illuminated. Due to other, unrelated maintenance, the airplane's next revenue flight was cancelled. Second shift mechanics were assigned maintenance on the airplane and decided to troubleshoot the unit.
Maintenance Actions
The CSD was mechanically recoupled, and the engine was started. After the engine start, the start valve light failed to go out, and the engine was shut down. A mechanic removed the main CSD wiring harness cannon plug to aid troubleshooting. The start valve was replaced, and the engine was run up. At the conclusion of the engine run-up, the CSD cannon plug was not reconnected. After shutdown, the start valve replacement was entered into the airplane maintenance records.
The mechanic who recoupled the CSD informed the lead mechanic of his action before leaving for the day. According to the company, the third shift mechanics did not have enough time to change the CSD. The number one engine was closed up, and the aircraft was dispatched.
Subsequent Events
During taxi from landing, the CSD caught fire.