A DC9-10 at 17000 ft at start of descent diverted due to left engine spooling down with high egt.

Attributes
ACN	569558
Time
Date	200212
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dtw.airport
State Reference	MI
Altitude	msl single value : 17000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 10
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : multi engine pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 8850 flight time type : 3200
ASRS Report	569558
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : l engine indications other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

At 17000 ft, brought engines to idle to begin descent. Left engine made loud humming noise, then wound down, egt rose rapidly. Completed appropriate checklists, secured engine. Diverted to dtw. Callback conversation with reporter revealed the following information: the reporter stated the cause of the left engine loss of power is unknown as maintenance has not released any details or findings.

Original NASA ASRS Text

Title: A DC9-10 AT 17000 FT AT START OF DSCNT DIVERTED DUE TO L ENG SPOOLING DOWN WITH HIGH EGT.

Narrative: AT 17000 FT, BROUGHT ENGS TO IDLE TO BEGIN DSCNT. L ENG MADE LOUD HUMMING NOISE, THEN WOUND DOWN, EGT ROSE RAPIDLY. COMPLETED APPROPRIATE CHKLISTS, SECURED ENG. DIVERTED TO DTW. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE L ENG LOSS OF PWR IS UNKNOWN AS MAINT HAS NOT RELEASED ANY DETAILS OR FINDINGS.

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.