<< >> NASA ASRS Report 1018219, June 2012

A gulfstream iv with spiking tgt in the left engine diverted to a nearby airport with the engine at idle.

Attributes
ACN	1018219
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 Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

While en route at FL400 we received a red cas message 'engine exceedance' and observed the left engine tgt spiking two or three times between 910-990 degrees (left throttle was retarded during that period); which is beyond engine limitations. We consulted the aircrafts QRH and afm manuals for 'engine exceedance.' per checklist procedure we retarded the throttle to idle and the engine tgt returned to normal operating limits. We were unable to maintain FL400 with the left engine at idle. An emergency was declared and a descent was initiated. We requested and were given divert to the nearest suitable airport. Brief holding was required to achieve landing weight and the eventual landing was uneventful.

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Original NASA ASRS Text

Title: A Gulfstream IV with spiking TGT in the left engine diverted to a nearby airport with the engine at idle.

Narrative: While en route at FL400 we received a red CAS message 'Engine Exceedance' and observed the left engine TGT spiking two or three times between 910-990 degrees (left throttle was retarded during that period); which is beyond engine limitations. We consulted the aircrafts QRH and AFM manuals for 'Engine Exceedance.' Per checklist procedure we retarded the throttle to idle and the engine TGT returned to normal operating limits. We were unable to maintain FL400 with the left engine at idle. An emergency was declared and a descent was initiated. We requested and were given divert to the nearest suitable airport. Brief holding was required to achieve landing weight and the eventual landing was uneventful.

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.