ATR-72 PIC report on aircraft equipment problem of engine losing torque and departure controller calling out the emergency ground equipment for precautionary landing.

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Attributes
ACN	292358
Time
Date	199412
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	ATR 72
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 6500 flight time type : 280
ASRS Report	292358
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : provided flight assist flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Shortly after leveling aircraft's #2 engine had slight torque rollback. Approximately 3 min later engine had severe torque rollback -- engine recovered then repeated. We diverted back to dfw -- engine ran normally during approach and landing phase -- we intended to only do a precautionary landing. Approach control declared emergency and equipment was standing by. All checklists were completed normally and we briefed emergency procedures should they become necessary.

Original NASA ASRS Text

Title: ATR-72 PIC RPT ON ACFT EQUIP PROB OF ENG LOSING TORQUE AND DEP CTLR CALLING OUT THE EMER GND EQUIP FOR PRECAUTIONARY LNDG.

Narrative: SHORTLY AFTER LEVELING ACFT'S #2 ENG HAD SLIGHT TORQUE ROLLBACK. APPROX 3 MIN LATER ENG HAD SEVERE TORQUE ROLLBACK -- ENG RECOVERED THEN REPEATED. WE DIVERTED BACK TO DFW -- ENG RAN NORMALLY DURING APCH AND LNDG PHASE -- WE INTENDED TO ONLY DO A PRECAUTIONARY LNDG. APCH CTL DECLARED EMER AND EQUIP WAS STANDING BY. ALL CHKLISTS WERE COMPLETED NORMALLY AND WE BRIEFED EMER PROCS SHOULD THEY BECOME NECESSARY.

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.