BE76 training flight diverts to alternate airport when unable to unfeather and restart the right engine. It had been shut down for demonstration purposes to trainee. Cold, congealed oil was the problem.

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Attributes
ACN	366980
Time
Date	199704
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cuh
State Reference	OK
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc tower : jfk
Operator	general aviation : instructional
Make Model Name	Duchess 76
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude other other
Route In Use	enroute airway : zkc
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : instrument pilot : commercial
Experience	flight time last 90 days : 355 flight time total : 921 flight time type : 121
ASRS Report	366980
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On apr/sun/97, I was en route from tul to pwa in a BE76 on a training flight. I was showing my student a full shutdown of the right engine. After feathering and securing the engine, we attempted a restart. The restart was unsuccessful. After going through the emergency checklist, we confirmed that the right engine was not going to restart. I canceled our IFR flight plan and asked for the nearest suitable airport. After an uneventful landing we taxied to the ramp area and shutdown. After checking the fuel and sumping the lines for fuel contamination and other possible problems, and at that point found nothing abnormal. I then restarted the right engine and everything checked normal and green. After refueling for extra reserves, we taxied for departure and completed a normal run-up and I determined the plane airworthy and departed for an uneventful flight back to wiley post. After landing I notified maintenance. I attributed the cause of the problem to the feathered propeller, leaving it in the feathered position too long, causing the oil to become too cold to unfeather it.

Original NASA ASRS Text

Title: BE76 TRAINING FLT DIVERTS TO ALTERNATE ARPT WHEN UNABLE TO UNFEATHER AND RESTART THE R ENG. IT HAD BEEN SHUT DOWN FOR DEMONSTRATION PURPOSES TO TRAINEE. COLD, CONGEALED OIL WAS THE PROB.

Narrative: ON APR/SUN/97, I WAS ENRTE FROM TUL TO PWA IN A BE76 ON A TRAINING FLT. I WAS SHOWING MY STUDENT A FULL SHUTDOWN OF THE R ENG. AFTER FEATHERING AND SECURING THE ENG, WE ATTEMPTED A RESTART. THE RESTART WAS UNSUCCESSFUL. AFTER GOING THROUGH THE EMER CHKLIST, WE CONFIRMED THAT THE R ENG WAS NOT GOING TO RESTART. I CANCELED OUR IFR FLT PLAN AND ASKED FOR THE NEAREST SUITABLE ARPT. AFTER AN UNEVENTFUL LNDG WE TAXIED TO THE RAMP AREA AND SHUTDOWN. AFTER CHKING THE FUEL AND SUMPING THE LINES FOR FUEL CONTAMINATION AND OTHER POSSIBLE PROBS, AND AT THAT POINT FOUND NOTHING ABNORMAL. I THEN RESTARTED THE R ENG AND EVERYTHING CHKED NORMAL AND GREEN. AFTER REFUELING FOR EXTRA RESERVES, WE TAXIED FOR DEP AND COMPLETED A NORMAL RUN-UP AND I DETERMINED THE PLANE AIRWORTHY AND DEPARTED FOR AN UNEVENTFUL FLT BACK TO WILEY POST. AFTER LNDG I NOTIFIED MAINT. I ATTRIBUTED THE CAUSE OF THE PROB TO THE FEATHERED PROP, LEAVING IT IN THE FEATHERED POS TOO LONG, CAUSING THE OIL TO BECOME TOO COLD TO UNFEATHER IT.

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.