Commercial Fixed Wing
Maintenance Powerplant; Maintenance Airframe
Training / Qualification; Communication Breakdown; Situational Awareness; Distraction; Confusion
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown
General None Reported / Taken
Aircraft; Company Policy; Human Factors; Procedure
[Merged Air Carrier operations have flight crews] leaving aircraft Hydraulic System Electric Pumps 'A' and 'B' hydraulic switch in the 'On' position on [aircraft] turns. Aircraft on gate for three hours; this creates a hazard for the mechanic working the aircraft. He has no idea who is in the cockpit and what they will touch; or what will move. Physical health [concerns]. We have not been briefed on the [merged air carrier's] thru trip policy.
A Line Mechanic reports about the hazards that have been created by their [merged air carrier's] thru trip policy of leaving Hydraulic System Electric Pumps 'A' and 'B' hydraulic switches in the 'On' position during  [aircraft] turns.