<< >> NASA ASRS Report 579083, April 2003

Flight crew of B744 experienced reduced control authority/authorized on left roll inputs. Declared emergency and landed at destination airport.

Attributes
ACN	579083
Time
Date	200304
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp.artcc
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : relief pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8000 flight time type : 2330
ASRS Report	579083
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical cabin event other
Independent Detector	aircraft equipment other aircraft equipment : restr aileron ctl other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Restr aileron control, especially to the left, due maybe to water leak that might have iced up. An emergency was declared and we all agreed to proceed to ord and land on runway 14 to minimize turns either way, especially left. The outcome was a smooth landing. The cabin was prepared for evacuate/evacuation and a brace signal given at 500 ft, followed by an announcement during the landing roll for everyone to stay seated. Great CRM.

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Original NASA ASRS Text

Title: FLT CREW OF B744 EXPERIENCED REDUCED CTL AUTH ON L ROLL INPUTS. DECLARED EMER AND LANDED AT DEST ARPT.

Narrative: RESTR AILERON CTL, ESPECIALLY TO THE L, DUE MAYBE TO WATER LEAK THAT MIGHT HAVE ICED UP. AN EMER WAS DECLARED AND WE ALL AGREED TO PROCEED TO ORD AND LAND ON RWY 14 TO MINIMIZE TURNS EITHER WAY, ESPECIALLY L. THE OUTCOME WAS A SMOOTH LNDG. THE CABIN WAS PREPARED FOR EVAC AND A BRACE SIGNAL GIVEN AT 500 FT, FOLLOWED BY AN ANNOUNCEMENT DURING THE LNDG ROLL FOR EVERYONE TO STAY SEATED. GREAT CRM.

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.