An MD80 on descent at 11800 ft declared an emergency due to #1 engine overspd with all indications r...

Attributes
ACN	432059
Time
Date	199903
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : jen.vortac
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 11800
Environment
Light	Daylight
Aircraft 1
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	432059
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : engine indications other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : returned to original clearance flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft

Narrative:

During descent, the left engine accelerated beyond redline in all parameters with the throttle at idle. While we dealt with the problem, the aircraft climbed to 11800 ft before we resumed the descent. Since the engine was uncontrollable, I elected to shut it down using the fire handle. We declared an emergency, completed the appropriate checklists, and landed without further incident. Callback conversation with reporter revealed the following information: the reporter stated the first officer was operating the aircraft when the aircraft made a sudden yaw to the right. The reporter said the first thought was the right engine failed but the engine indications for the left engine were all at the redline and the engine was in an overspd condition. The reporter said the engine was immediately shut down and an emergency declared. The reporter stated that maintenance replaced the engine due to beyond overspd limits. The reporter said maintenance advised the cause of the overspd was a failed throttle position sensor in the main fuel control. The reporter said the engine was a JT8D-209.

Original NASA ASRS Text

Title: AN MD80 ON DSCNT AT 11800 FT DECLARED AN EMER DUE TO #1 ENG OVERSPD WITH ALL INDICATIONS REDLINED, CAUSED BY FAILURE OF THE FUEL CTL THROTTLE POS SENSING.

Narrative: DURING DSCNT, THE L ENG ACCELERATED BEYOND REDLINE IN ALL PARAMETERS WITH THE THROTTLE AT IDLE. WHILE WE DEALT WITH THE PROB, THE ACFT CLBED TO 11800 FT BEFORE WE RESUMED THE DSCNT. SINCE THE ENG WAS UNCTLABLE, I ELECTED TO SHUT IT DOWN USING THE FIRE HANDLE. WE DECLARED AN EMER, COMPLETED THE APPROPRIATE CHKLISTS, AND LANDED WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FO WAS OPERATING THE ACFT WHEN THE ACFT MADE A SUDDEN YAW TO THE R. THE RPTR SAID THE FIRST THOUGHT WAS THE R ENG FAILED BUT THE ENG INDICATIONS FOR THE L ENG WERE ALL AT THE REDLINE AND THE ENG WAS IN AN OVERSPD CONDITION. THE RPTR SAID THE ENG WAS IMMEDIATELY SHUT DOWN AND AN EMER DECLARED. THE RPTR STATED THAT MAINT REPLACED THE ENG DUE TO BEYOND OVERSPD LIMITS. THE RPTR SAID MAINT ADVISED THE CAUSE OF THE OVERSPD WAS A FAILED THROTTLE POS SENSOR IN THE MAIN FUEL CTL. THE RPTR SAID THE ENG WAS A JT8D-209.

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.

An MD80 on descent at 11800 ft declared an emergency due to #1 engine overspd with all indications redlined, caused by failure of the fuel control throttle position sensing.