Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Commercial
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Other / Unknown
Flight Crew Requested ATC Assistance / Clarification
Aircraft; Human Factors; Procedure
On approach the hydraulic gauge began fluctuating randomly with simultaneous MAP lights and noises in the jumpseat area. Immediately we slowed; lowered gear; and flaps in preparation for landing. Tower was notified of our status and notified of assistance needed. The left hydraulic light remained illuminated but the right light went on and off with associated fluctuations in its gauge throughout the approach; landing; and taxi to the ramp. At 500 feet full flaps were deployed and successfully set. Identification: noises; gauges; and annunciation lights made us aware of the event when it began. Cause: hydraulic leak from lines being chaffed due to insufficient vibration isolation. Response: slow down; lower gear; extend flaps; QRH (Quick Reference Handbook); notify Tower. Suggestions: maintenance action that has been learned from past experiences of the same situation and preventative actions taken to eliminate recurrence.
Flight crew flying an SA227AT observed fluctuating hydraulic gauge and noises. Landed without incident.