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Aircraft equipment problem. Air carrier has the #2 INS system fail which in turn caused the first officer's attitude indicator and autoplt to malfunction and fail.
| Attributes | |
| ACN | 311233 |
| Time | |
| Date | 199507 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : alb |
| State Reference | NY |
| Altitude | msl bound lower : 37000 msl bound upper : 37500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw tower : bos |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : cfi pilot : atp pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 15000 flight time type : 210 |
| ASRS Report | 311233 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 4500 |
| ASRS Report | 310906 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : far non adherence : clearance other anomaly other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
The #2 INS had an instantaneous failure with the 'B' autoplt engaged. (#2 INS controling the attitude indicator (ADI) and the autoplt.) when this failure occurred, the aircraft rolled into 45 degree right bank and pitched up. No warning (no attitude or gyroscope flags appeared). I recovered the attitude with pitch reduction and roll to level flight using the standby attitude indicator and visual references. The aircraft had gained 500 ft and was immediately descended to FL370. ATC questioned the deviation and was informed that the attitude indicator failed and we had returned to FL370. No traffic conflicts reported or observed on TCASII or by ATC.
Original NASA ASRS Text
Title: ACFT EQUIP PROB. ACR HAS THE #2 INS SYS FAIL WHICH IN TURN CAUSED THE FO'S ATTITUDE INDICATOR AND AUTOPLT TO MALFUNCTION AND FAIL.
Narrative: THE #2 INS HAD AN INSTANTANEOUS FAILURE WITH THE 'B' AUTOPLT ENGAGED. (#2 INS CTLING THE ATTITUDE INDICATOR (ADI) AND THE AUTOPLT.) WHEN THIS FAILURE OCCURRED, THE ACFT ROLLED INTO 45 DEG R BANK AND PITCHED UP. NO WARNING (NO ATTITUDE OR GYROSCOPE FLAGS APPEARED). I RECOVERED THE ATTITUDE WITH PITCH REDUCTION AND ROLL TO LEVEL FLT USING THE STANDBY ATTITUDE INDICATOR AND VISUAL REFS. THE ACFT HAD GAINED 500 FT AND WAS IMMEDIATELY DSNDED TO FL370. ATC QUESTIONED THE DEV AND WAS INFORMED THAT THE ATTITUDE INDICATOR FAILED AND WE HAD RETURNED TO FL370. NO TFC CONFLICTS RPTED OR OBSERVED ON TCASII OR BY ATC.
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.