<< >> NASA ASRS Report 504654, March 2001

A DC9-30 at start of descent at FL350 the right engine thrust lever was found frozen. Thrust lever control regained at 5000 ft.

Attributes
ACN	504654
Time
Date	200103
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	msl single value : 35000
Environment
Flight Conditions	IMC
Weather Elements	Rain Ice Windshear
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp.artcc
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : multi engine pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time total : 12920 flight time type : 290
ASRS Report	504654
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	aircraft : equipment problem dissipated
Consequence	other
Supplementary
Problem Areas	Aircraft Weather
Primary Problem	Aircraft

Narrative:

Departed cvg in rain and gusty winds, climbed to FL350. Were at altitude for 1 hour 15 mins en route to msp. Upon beginning our descent to msp, right throttle would not move. It appeared to be frozen. Asked for alternate descent off the arrival STAR. Contacted our company maintenance for suggestions, but they had none. Had an extremely low altimeter setting 28.50 -- thought it was 29.50, so upon leveloff at 11000 ft we were actually at 10100 ft. Due to problem and 1 pilot talking to company, both pilots missed altimeter setting until ATC told us that we should check our altimeter setting. Maneuvered at 5000 ft for 15 mins. We tried to unfreeze throttle. Planned to land on longest runway and the company had called out emergency equipment but we did not declare emergency. On final into msp, we were finally able to unfreeze the throttle and land normally. Maintenance found small crack in cable housing.

Related reports:

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Original NASA ASRS Text

Title: A DC9-30 AT START OF DSCNT AT FL350 THE R ENG THRUST LEVER WAS FOUND FROZEN. THRUST LEVER CTL REGAINED AT 5000 FT.

Narrative: DEPARTED CVG IN RAIN AND GUSTY WINDS, CLBED TO FL350. WERE AT ALT FOR 1 HR 15 MINS ENRTE TO MSP. UPON BEGINNING OUR DSCNT TO MSP, R THROTTLE WOULD NOT MOVE. IT APPEARED TO BE FROZEN. ASKED FOR ALTERNATE DSCNT OFF THE ARR STAR. CONTACTED OUR COMPANY MAINT FOR SUGGESTIONS, BUT THEY HAD NONE. HAD AN EXTREMELY LOW ALTIMETER SETTING 28.50 -- THOUGHT IT WAS 29.50, SO UPON LEVELOFF AT 11000 FT WE WERE ACTUALLY AT 10100 FT. DUE TO PROB AND 1 PLT TALKING TO COMPANY, BOTH PLTS MISSED ALTIMETER SETTING UNTIL ATC TOLD US THAT WE SHOULD CHK OUR ALTIMETER SETTING. MANEUVERED AT 5000 FT FOR 15 MINS. WE TRIED TO UNFREEZE THROTTLE. PLANNED TO LAND ON LONGEST RWY AND THE COMPANY HAD CALLED OUT EMER EQUIP BUT WE DID NOT DECLARE EMER. ON FINAL INTO MSP, WE WERE FINALLY ABLE TO UNFREEZE THE THROTTLE AND LAND NORMALLY. MAINT FOUND SMALL CRACK IN CABLE HOUSING.

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.