Incident Overview
According to the captain's statement, a low oil level warning lamp for the 'B' hydraulic system illuminated while the aircraft was in cruise flight. As the captain completed the failure checklist and configured the 'B' system into standby rudder condition—which supplies hydraulic pressure only to the rudder—the 'A' hydraulic system subsequently failed.
Flight Continuation and Landing
The flight continued to its intended destination. Upon arrival, the crew found that the trailing edge flaps could not be lowered. The source attributes this to another malfunction. Despite the flap issue, the aircraft landed without incident.
System Details
The aircraft's hydraulic systems are designed with redundancy. The 'B' system standby rudder condition is a degraded mode that limits hydraulic power to the rudder. The failure of the 'A' system after the 'B' system was reconfigured resulted in a loss of hydraulic pressure for other systems, including flap operation.
No further details about the aircraft type, registration, operator, or date are provided in the source.