A glf iv noted spiking left engine tgt; unaccompanied by other engine instrument anomalies. The flig...

Attributes
ACN	1017725
Time
Date	201206
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Gulfstream IV / G350 / G450
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

While at FL400 in cruise the left engine tgt spiked to over 990; went back to normal and then spiked again. There were no changes in hp or lp fan speed; fuel flow or thrust changes. The left engine power lever was moved to idle and no more tgt spikes were observed. We completed all qrc; QRH and aom check lists; declared an emergency with ATC and requested a diversion to a nearby airport. After holding for 15 minutes to burn off fuel we conducted a normal landing and taxied to the airport FBO.

Original NASA ASRS Text

Title: A GLF IV noted spiking left engine TGT; unaccompanied by other engine instrument anomalies. The flight crew declared an emergency and diverted to a nearby airport.

Narrative: While at FL400 in cruise the left engine TGT spiked to over 990; went back to normal and then spiked again. There were no changes in HP or LP Fan speed; fuel flow or thrust changes. The left engine power lever was moved to idle and no more TGT spikes were observed. We completed all QRC; QRH and AOM check lists; declared an emergency with ATC and requested a diversion to a nearby airport. After holding for 15 minutes to burn off fuel we conducted a normal landing and taxied to the airport FBO.

Data retrieved from NASA's ASRS site as of July 2013 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.

A glf iv noted spiking left engine tgt; unaccompanied by other engine instrument anomalies. The flight crew declared an emergency and diverted to a nearby airport.