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A G4 cpr flight leaves its assigned altitude of FL350 when the flight crew experiences a failure of one of the air data computers 75 mi west of bqk, or.
| Attributes | |
| ACN | 513449 |
| Time | |
| Date | 200106 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bqk.airport |
| State Reference | GA |
| Altitude | msl bound lower : 35000 msl bound upper : 35400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Gulfstream IV |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Experience | flight time total : 4300 flight time type : 40 |
| ASRS Report | 513449 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : provided flight assist flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Leveling at FL350 aircraft experienced air data computer failure causing overspd warning, engine exceedence, loss of yaw damper, loss of pitch trim, autoplt disconnect, autothrottle disconnect, and miscompare of basic airspeed and altitude information between pilot and copilot position. Resulted in minor altitude deviation (400 ft) for brief period while stabilizing situation, and while pending ATC approval of block altitude for troubleshooting. Idented and selected the correctly functioning air data computer and canceled block altitude request after re-establishing at FL350. ATC controller very helpful.
Original NASA ASRS Text
Title: A G4 CPR FLT LEAVES ITS ASSIGNED ALT OF FL350 WHEN THE FLC EXPERIENCES A FAILURE OF ONE OF THE AIR DATA COMPUTERS 75 MI W OF BQK, OR.
Narrative: LEVELING AT FL350 ACFT EXPERIENCED AIR DATA COMPUTER FAILURE CAUSING OVERSPD WARNING, ENG EXCEEDENCE, LOSS OF YAW DAMPER, LOSS OF PITCH TRIM, AUTOPLT DISCONNECT, AUTOTHROTTLE DISCONNECT, AND MISCOMPARE OF BASIC AIRSPD AND ALT INFO BTWN PLT AND COPLT POS. RESULTED IN MINOR ALTDEV (400 FT) FOR BRIEF PERIOD WHILE STABILIZING SIT, AND WHILE PENDING ATC APPROVAL OF BLOCK ALT FOR TROUBLESHOOTING. IDENTED AND SELECTED THE CORRECTLY FUNCTIONING AIR DATA COMPUTER AND CANCELED BLOCK ALT REQUEST AFTER RE-ESTABLISHING AT FL350. ATC CTLR VERY HELPFUL.
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.