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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.
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.