Dash 8-300
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Gate; General Maintenance Action
Aircraft; Procedure
Taxiing to the runway we noticed a flicker of the red master warning light [then] determined that it was [responding to] the #1 Engine low oil pressure light. We contacted Ground and asked to return to the gate to have a mechanical problem resolved and the Controller started us back up the inner taxiways. As we cleared the active outer taxiways we performed the memory action items for low oil pressure but did not at first need to shut the engine down; as the pressure hovered at first around 55 PSI. Later on we needed to stop and shut the engine down as the pressure began to degrade rapidly. We contacted Dispatch and Maintenance to coordinate a return to gate. We arrived at the gate with no further problems. Maintenance met the aircraft as we deplaned and quickly determined that the oil cap had been left unattached following the last oil service.
A Dash 8 flight crew returned to the gate in response to a left engine low oil pressure warning. Maintenance determined the oil filler cap had not been secured following a previous service.