 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Widebody transport on climb on automatic throttle. At level off automatic throttles remained at climb power causing aircraft to momentarily balloon above assigned altitude until flight crew manually reduced thrust and flew aircraft back to assigned altitude.
| Attributes | |
| ACN | 108456 |
| Time | |
| Date | 198904 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 3000 msl bound upper : 3600 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 21290 |
| ASRS Report | 108456 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 10000 flight time type : 370 |
| ASRS Report | 108687 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : regained aircraft control flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Automatic throttles stayed in takeoff power mode (N1/EPR) at level off instead of reducing to climb power (speed mode). The additional power caused aircraft to increase speed and ballooned through 3000' to 3600' as nose was lowered and throttles manually retarded. The climb was in IMC during heavy workload, and radio switching frequency. Aircraft was returned immediately to 3000' west/O further incident or notation by ATC.
Original NASA ASRS Text
Title: WDB ON CLIMB ON AUTO THROTTLE. AT LEVEL OFF AUTO THROTTLES REMAINED AT CLIMB POWER CAUSING ACFT TO MOMENTARILY BALLOON ABOVE ASSIGNED ALT UNTIL FLT CREW MANUALLY REDUCED THRUST AND FLEW ACFT BACK TO ASSIGNED ALT.
Narrative: AUTO THROTTLES STAYED IN TKOF PWR MODE (N1/EPR) AT LEVEL OFF INSTEAD OF REDUCING TO CLB PWR (SPD MODE). THE ADDITIONAL PWR CAUSED ACFT TO INCREASE SPD AND BALLOONED THROUGH 3000' TO 3600' AS NOSE WAS LOWERED AND THROTTLES MANUALLY RETARDED. THE CLB WAS IN IMC DURING HEAVY WORKLOAD, AND RADIO SWITCHING FREQ. ACFT WAS RETURNED IMMEDIATELY TO 3000' W/O FURTHER INCIDENT OR NOTATION BY ATC.
Data retrieved from NASA's ASRS site as of August 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.