A PC12 eis intermittently failed causing generator and engine instrument anomalies to be displayed.

Attributes
ACN	853013
Time
Date	200909
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PC-12
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Engine Indications
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

After descending to FL050. I noticed the amber eis annunciator flashing. The bottom half of the eis was intermittently failing. At one point the battery showed a 26-amp discharge while the gen 1 showed positive indications. Several times the prop RPM indications dipped down to 300 and then resumed to 1700 RPM. Fuel flow indications were missing; as well as engine oil temp and engine oil pressure. Requested priority handling from approach control; they then treated it as an emergency.

Original NASA ASRS Text

Title: A PC12 EIS intermittently failed causing generator and engine instrument anomalies to be displayed.

Narrative: After descending to FL050. I noticed the amber EIS annunciator flashing. The bottom half of the EIS was intermittently failing. At one point the Battery showed a 26-amp discharge while the Gen 1 showed positive indications. Several times the Prop RPM indications dipped down to 300 and then resumed to 1700 RPM. Fuel flow indications were missing; as well as Engine Oil Temp and Engine Oil Pressure. Requested priority handling from approach control; they then treated it as an emergency.

Data retrieved from NASA's ASRS site as of April 2012 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.