Astr crew had fluctuating and low oil pressure. The crew shut down the engine.

Attributes
ACN	606030
Time
Date	200401
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : aml.vor
State Reference	VA
Altitude	msl single value : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : corporate
Make Model Name	Gulfstream 100 [G100] (IAI 1125 Astra)
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 9500 flight time type : 300
ASRS Report	606030
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : no 1 eng oil pressure indication other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : landed in emergency condition flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Approximately 280 NM west of washing dulles airport, va, flight crew noticed left oil pressure variation from top of yellow arc to bottom. This fluctuation occurred for approximately 30 mins until the oil pressure dropped to below 50 psi. At that time the checklist was run for left engine shutdown as per flight manual. Left engine was shut down, potomac approach notified, emergency was declared and priority landing for runway 30 was accomplished. After landing, ATC was advised that no other services required and aircraft taxied normally to parking at FBO.

Original NASA ASRS Text

Title: ASTR CREW HAD FLUCTUATING AND LOW OIL PRESSURE. THE CREW SHUT DOWN THE ENG.

Narrative: APPROX 280 NM W OF WASHING DULLES ARPT, VA, FLT CREW NOTICED L OIL PRESSURE VARIATION FROM TOP OF YELLOW ARC TO BOTTOM. THIS FLUCTUATION OCCURRED FOR APPROX 30 MINS UNTIL THE OIL PRESSURE DROPPED TO BELOW 50 PSI. AT THAT TIME THE CHKLIST WAS RUN FOR L ENG SHUTDOWN AS PER FLT MANUAL. L ENG WAS SHUT DOWN, POTOMAC APCH NOTIFIED, EMER WAS DECLARED AND PRIORITY LNDG FOR RWY 30 WAS ACCOMPLISHED. AFTER LNDG, ATC WAS ADVISED THAT NO OTHER SVCS REQUIRED AND ACFT TAXIED NORMALLY TO PARKING AT FBO.

Data retrieved from NASA's ASRS site as of July 2007 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.