<< >> NASA ASRS Report 501129, February 2001

A DC9-30 descending from FL350 to FL310 declared an emergency and diverted due to left engine thrust lever stuck at 80%.

Attributes
ACN	501129
Time
Date	200102
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : yyz.airport
State Reference	FO
Altitude	msl bound lower : 31000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Route In Use	enroute airway : j546.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 1000 flight time type : 2500
ASRS Report	501129
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : left engine indication other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Weather Aircraft
Primary Problem	Aircraft

Narrative:

Received ATC clearance to descend from FL350 to FL310. Power was reduced to begin descent. Left throttle stuck at 80% N1. No procedure was found north our QRH checklist or other abnormal procedures index. Contacted maintenance control via air phone in cockpit. Obtained WX information from dispatch and amended release for favorable WX and runway conditions in atw. Diverted to atw and requested crash fire rescue equipment equipment to stand by. While configuring for approach, the left throttle became free. A normal approach and landing was made. At this time maintenance believes some water had gotten into the throttle cable and frozen. This is not the confirmed reason, as maintenance continues to investigate.

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Original NASA ASRS Text

Title: A DC9-30 DSNDING FROM FL350 TO FL310 DECLARED AN EMER AND DIVERTED DUE TO L ENG THRUST LEVER STUCK AT 80%.

Narrative: RECEIVED ATC CLRNC TO DSND FROM FL350 TO FL310. PWR WAS REDUCED TO BEGIN DSCNT. L THROTTLE STUCK AT 80% N1. NO PROC WAS FOUND N OUR QRH CHKLIST OR OTHER ABNORMAL PROCS INDEX. CONTACTED MAINT CTL VIA AIR PHONE IN COCKPIT. OBTAINED WX INFO FROM DISPATCH AND AMENDED RELEASE FOR FAVORABLE WX AND RWY CONDITIONS IN ATW. DIVERTED TO ATW AND REQUESTED CFR EQUIP TO STAND BY. WHILE CONFIGURING FOR APCH, THE L THROTTLE BECAME FREE. A NORMAL APCH AND LNDG WAS MADE. AT THIS TIME MAINT BELIEVES SOME WATER HAD GOTTEN INTO THE THROTTLE CABLE AND FROZEN. THIS IS NOT THE CONFIRMED REASON, AS MAINT CONTINUES TO INVESTIGATE.

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.