Maintenance Airframe; Maintenance Powerplant
Troubleshooting; Situational Awareness; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Human Factors; Manuals; Procedure
'A' System Electric Hydraulic Pump removed and replaced on a B737-700 aircraft; job completed working with Aircraft Maintenance Technician (AMT) 'Y'. AMT Y performed the pump replacement and cleanup of the work area after job completion. I assisted with tools; parts support and signing-off the logbook after job completion. Approximately four flight legs later; the crew reported having an 'A' System Electric low pressure light and a Circuit Breaker (C/B) popped. Contract Maintenance was called and re-secured the supply line from the reservoir to the pump and reset the C/B. Pump operated normal and aircraft continued. Possible [lack of] attention to detail. We were not under pressure or in a hurry; were given plenty of time. [Recommend] triple/quadruple check all connections.
Myself and fellow Mechanic X; had removed/replaced the 'A' System electric driven Hydraulic Pump on a B737-700 aircraft. I was informed that after five [flight] legs; the aircraft lost 'A' System Electric Hydraulic pressure at the gate and that Maintenance reseated the supply line from the reservoir and an Operational Check was good.
Two Line Mechanics were informed about a B737-700 aircraft that had lost 'A' System Electric Hydraulic pressure at a gate. Aircraft had flown only five flights since they had replaced the 'A' System Electric Hydraulic Pump.