<< >> NASA ASRS Report 515484, June 2001

A B767-300 in climb at FL290 incurred a 600 ft altitude deviation caused by failure of the left air data computer.

Attributes
ACN	515484
Time
Date	200106
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : anc.airport
State Reference	AK
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zan.artcc tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 10300 flight time type : 2100
ASRS Report	515484
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas message other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Passing FL230 climbing to FL290, rudder ratio and aileron lockout EICAS message occurred. Nearing leveloff, captain's altimeter failed and unwound to 10000 ft. We leveled off using first officer's altimeter after a deviation of 600 ft. Left CADC had failed.

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Original NASA ASRS Text

Title: A B767-300 IN CLIMB AT FL290 INCURRED A 600 FT ALTDEV CAUSED BY FAILURE OF THE L AIR DATA COMPUTER.

Narrative: PASSING FL230 CLBING TO FL290, RUDDER RATIO AND AILERON LOCKOUT EICAS MESSAGE OCCURRED. NEARING LEVELOFF, CAPT'S ALTIMETER FAILED AND UNWOUND TO 10000 FT. WE LEVELED OFF USING FO'S ALTIMETER AFTER A DEV OF 600 FT. L CADC HAD FAILED.

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.