Engine manifold pressure dropped when transitioning from climb to cruise. Engine shutdown.

Attributes
ACN	257042
Time
Date	199311
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lgu
State Reference	UT
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc artcc : zkc
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : intermediate altitude cruise other other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 1630 flight time type : 5
ASRS Report	257042
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Bringing power back from climb to cruise, right engine manifold pressure dropped through 30 inches manifold pressure and continued to 12 inches manifold pressure, resulting in yaw, loss of right engine. I reported difficulty to ATC and requested lower altitude. ATC said 'stand by.' feathered right engine due to '0' oil pressure. When engine was feathered, engine still producing power. After landing engine oil was 3.5 - 4.0 quarts. Could not hold altitude. Called ATC to announce descent. Requested priority handling direct slc. Cancelled IFR descending out of 16000 ft. Requested equipment and the ILS R17 approach for the benefit of GS information. Landed without incident. Mechanic says oil cooler failed. I see no way to anticipate an oil cooler fatigue failure. The aircraft had intermittent electric trim and left generator power relay difficulties which were not placarded.

Original NASA ASRS Text

Title: ENG MANIFOLD PRESSURE DROPPED WHEN TRANSITIONING FROM CLB TO CRUISE. ENG SHUTDOWN.

Narrative: BRINGING PWR BACK FROM CLB TO CRUISE, R ENG MANIFOLD PRESSURE DROPPED THROUGH 30 INCHES MANIFOLD PRESSURE AND CONTINUED TO 12 INCHES MANIFOLD PRESSURE, RESULTING IN YAW, LOSS OF R ENG. I RPTED DIFFICULTY TO ATC AND REQUESTED LOWER ALT. ATC SAID 'STAND BY.' FEATHERED R ENG DUE TO '0' OIL PRESSURE. WHEN ENG WAS FEATHERED, ENG STILL PRODUCING PWR. AFTER LNDG ENG OIL WAS 3.5 - 4.0 QUARTS. COULD NOT HOLD ALT. CALLED ATC TO ANNOUNCE DSCNT. REQUESTED PRIORITY HANDLING DIRECT SLC. CANCELLED IFR DSNDING OUT OF 16000 FT. REQUESTED EQUIP AND THE ILS R17 APCH FOR THE BENEFIT OF GS INFO. LANDED WITHOUT INCIDENT. MECH SAYS OIL COOLER FAILED. I SEE NO WAY TO ANTICIPATE AN OIL COOLER FATIGUE FAILURE. THE ACFT HAD INTERMITTENT ELECTRIC TRIM AND L GENERATOR PWR RELAY DIFFICULTIES WHICH WERE NOT PLACARDED.

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.