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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Aircraft equipment problem - the flight management guidance computer malfunctioned and reduced the thrust to the point that the airspeed dropped 7-15 KTS into alpha protection area.
| Attributes | |
| ACN | 300386 |
| Time | |
| Date | 199503 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : sjn |
| State Reference | AZ |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 180 flight time total : 25000 flight time type : 900 |
| ASRS Report | 300386 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
At 37000 ft, 139000 pounds both engines N1 retarded to 70 percent, airspeed fell to 7-15 KTS in alpha protection alpha floor did not activate. Power then went to climb power and when airspeed recovered, we went to manual throttles. Wrote logbook entry as such. Later found that first officer's flight management guidance computer had a fault shown on centralized fault display system which caused the condition. Cockpit resource management worked well during incident.
Original NASA ASRS Text
Title: ACFT EQUIP PROB - THE FLT MGMNT GUIDANCE COMPUTER MALFUNCTIONED AND REDUCED THE THRUST TO THE POINT THAT THE AIRSPD DROPPED 7-15 KTS INTO ALPHA PROTECTION AREA.
Narrative: AT 37000 FT, 139000 LBS BOTH ENGS N1 RETARDED TO 70 PERCENT, AIRSPD FELL TO 7-15 KTS IN ALPHA PROTECTION ALPHA FLOOR DID NOT ACTIVATE. PWR THEN WENT TO CLB PWR AND WHEN AIRSPD RECOVERED, WE WENT TO MANUAL THROTTLES. WROTE LOGBOOK ENTRY AS SUCH. LATER FOUND THAT FO'S FLT MGMNT GUIDANCE COMPUTER HAD A FAULT SHOWN ON CENTRALIZED FAULT DISPLAY SYS WHICH CAUSED THE CONDITION. COCKPIT RESOURCE MGMNT WORKED WELL DURING INCIDENT.
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.