Narrative:

Approximately 8 miles west of; and while descending to zzzzz intersection (ILS at ZZZ); the master warning light flashed. I scanned the annunciator panel and then the rest of the instruments and saw no abnormality or annunciator light on. The captain pushed the master warning without identifying a cause. A moment later the master warning flashed again and again the captain pushed the master warning without identifying a cause. About a minute later it flashed again; this time with the 'low oil pressure (rh)' annunciator light illuminating. At this point I grabbed the emergency checklist and found the corresponding checklist for low oil pressure. The oil pressure gauge read just above 60 psi as this point. I waited for the captain to call for the checklist as I verbally stated the oil pressure reading. A moment later the oil pressure was below 60 psi. I stated the oil pressure and told the captain what the checklist said. He acknowledged. Power remained at approximately 80% N1 on both engines. A moment later I stated the oil pressure was below 40 psi and read aloud the checklist for oil pressure below 40 which included a shutdown of the engine. The captain said he was going to do that and proceeded to shut the right engine down before reaching zzzzz intersection. I asked the captain if he wanted me to [advise ATC about emergency situation] and he said no. We landed without further incident.

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Original NASA ASRS Text

Title: Air taxi flight crew reported low oil pressure on one engine while on initial approach. Crew followed the appropriate checklist; secured the engine and landed without incident.

Narrative: Approximately 8 miles west of; and while descending to ZZZZZ intersection (ILS at ZZZ); the Master Warning light flashed. I scanned the annunciator panel and then the rest of the instruments and saw no abnormality or annunciator light on. The captain pushed the Master Warning without identifying a cause. A moment later the Master Warning flashed again and again the captain pushed the Master Warning without identifying a cause. About a minute later it flashed again; this time with the 'low oil pressure (rh)' annunciator light illuminating. At this point I grabbed the emergency checklist and found the corresponding checklist for low oil pressure. The oil pressure gauge read just above 60 PSI as this point. I waited for the captain to call for the checklist as I verbally stated the oil pressure reading. A moment later the oil pressure was below 60 PSI. I stated the oil pressure and told the captain what the checklist said. He acknowledged. Power remained at approximately 80% N1 on both engines. A moment later I stated the oil pressure was below 40 PSI and read aloud the checklist for oil pressure below 40 which included a shutdown of the engine. The captain said he was going to do that and proceeded to shut the right engine down before reaching ZZZZZ Intersection. I asked the captain if he wanted me to [advise ATC about emergency situation] and he said no. We landed without further incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.