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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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PF canceled the altitude capture by changing flight guidance system modes as the logic was leveling the aircraft. Altitude hold and vertical speed would not respond soon enough to avoid the altitude overshoot with the rate of climb at the time.
| Attributes | |
| ACN | 323469 |
| Time | |
| Date | 199512 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 26000 msl bound upper : 26400 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : mia |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 323469 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 323470 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On climb out from ord we were to level at 26000 ft. Somewhere around FL250 I was going to switch from EPR climb to mach speed. I instead selected mach climb which canceled altitude capture. At FL259 I selected altitude hold. Climbing through FL262 the rate of climb had not changed from approximately 2000 FPM so I disconnected the autoplt. By now we were at FL263 and climbing. I stopped the climb at FL264 and returned to FL260 and reengaged the autoplt. No traffic was noted visually or on TCASII and no call was made or received from ord center. Captain was flying this leg.
Original NASA ASRS Text
Title: PF CANCELED THE ALT CAPTURE BY CHANGING FLT GUIDANCE SYS MODES AS THE LOGIC WAS LEVELING THE ACFT. ALT HOLD AND VERT SPD WOULD NOT RESPOND SOON ENOUGH TO AVOID THE ALT OVERSHOOT WITH THE RATE OF CLB AT THE TIME.
Narrative: ON CLBOUT FROM ORD WE WERE TO LEVEL AT 26000 FT. SOMEWHERE AROUND FL250 I WAS GOING TO SWITCH FROM EPR CLB TO MACH SPD. I INSTEAD SELECTED MACH CLB WHICH CANCELED ALT CAPTURE. AT FL259 I SELECTED ALT HOLD. CLBING THROUGH FL262 THE RATE OF CLB HAD NOT CHANGED FROM APPROX 2000 FPM SO I DISCONNECTED THE AUTOPLT. BY NOW WE WERE AT FL263 AND CLBING. I STOPPED THE CLB AT FL264 AND RETURNED TO FL260 AND REENGAGED THE AUTOPLT. NO TFC WAS NOTED VISUALLY OR ON TCASII AND NO CALL WAS MADE OR RECEIVED FROM ORD CTR. CAPT WAS FLYING THIS LEG.
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.