An ATR72 on descent from 10000 ft had the #2 engine oil pressure indication drop to zero and when the power lever was pulled back the pressure indicator returned to normal.

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Attributes
ACN	418530
Time
Date	199810
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : tul
State Reference	OK
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	ATR 72
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 9000 flight time type : 280
ASRS Report	418530
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

#2 oil pressure gauge dropped to zero. We reviewed the QRH then started the QRH items. The power lever was retarded to flight idle. Then the oil pressure gauge regained normal indications. Landed without damage or injury. Callback conversation with reporter revealed the following information: the reporter stated the aircraft has 2 sensors on each of the engines for engine oil pressure warning. The reporter said 1 sensor feeds the master caution system low oil pressure warning light and the other sensor feeds the oil pressure indicator and the indicator internal red warning light. The reporter said the quick reference handbook required shut down of the engine to determine the faulty sensor. The reporter stated the maintenance department found a loose wire in the oil pressure indicator sensor on the engine.

Original NASA ASRS Text

Title: AN ATR72 ON DSCNT FROM 10000 FT HAD THE #2 ENG OIL PRESSURE INDICATION DROP TO ZERO AND WHEN THE PWR LEVER WAS PULLED BACK THE PRESSURE INDICATOR RETURNED TO NORMAL.

Narrative: #2 OIL PRESSURE GAUGE DROPPED TO ZERO. WE REVIEWED THE QRH THEN STARTED THE QRH ITEMS. THE PWR LEVER WAS RETARDED TO FLT IDLE. THEN THE OIL PRESSURE GAUGE REGAINED NORMAL INDICATIONS. LANDED WITHOUT DAMAGE OR INJURY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT HAS 2 SENSORS ON EACH OF THE ENGS FOR ENG OIL PRESSURE WARNING. THE RPTR SAID 1 SENSOR FEEDS THE MASTER CAUTION SYS LOW OIL PRESSURE WARNING LIGHT AND THE OTHER SENSOR FEEDS THE OIL PRESSURE INDICATOR AND THE INDICATOR INTERNAL RED WARNING LIGHT. THE RPTR SAID THE QUICK REF HANDBOOK REQUIRED SHUT DOWN OF THE ENG TO DETERMINE THE FAULTY SENSOR. THE RPTR STATED THE MAINT DEPT FOUND A LOOSE WIRE IN THE OIL PRESSURE INDICATOR SENSOR ON THE ENG.

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.