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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A B737-700 crew overshot their assigned altitude, believing that their autoplt is coupled. It wasn't, maintenance had disengaged both autoplts prior to the flight.
| Attributes | |
| ACN | 403852 |
| Time | |
| Date | 199804 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : idu |
| State Reference | TX |
| Altitude | msl bound lower : 31000 msl bound upper : 31300 |
| Environment | |
| Flight Conditions | VMC VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | B737-600, -700, -800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute airway : zhu |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 7000 flight time type : 230 |
| ASRS Report | 403852 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence other |
| 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:
First flight in a new model B737 aircraft. The new model B737- 700 has a glass cockpit with many system differences compared to the B737-200, B737-300, or B737-500 aircraft we usually fly. This was my first flight and the captain's second flight in the B737-700. We had received the aircraft from maintenance and did not realize they had used the 'gang bar' to disengage both autoplt system. As we were climbing out, the captain (PF) selected the 'a' autoplt. The aircraft was trimmed and stable. As we approached our assigned altitude I noticed the aircraft rate of climb was not decreasing. I asked the captain if the aircraft was going to level off. He immediately took control of the aircraft and leveled as best he could, but due to our high rate of climb, we leveled approximately 300 ft high. We corrected to altitude as soon as possible.
Original NASA ASRS Text
Title: A B737-700 CREW OVERSHOT THEIR ASSIGNED ALT, BELIEVING THAT THEIR AUTOPLT IS COUPLED. IT WASN'T, MAINT HAD DISENGAGED BOTH AUTOPLTS PRIOR TO THE FLT.
Narrative: FIRST FLT IN A NEW MODEL B737 ACFT. THE NEW MODEL B737- 700 HAS A GLASS COCKPIT WITH MANY SYS DIFFERENCES COMPARED TO THE B737-200, B737-300, OR B737-500 ACFT WE USUALLY FLY. THIS WAS MY FIRST FLT AND THE CAPT'S SECOND FLT IN THE B737-700. WE HAD RECEIVED THE ACFT FROM MAINT AND DID NOT REALIZE THEY HAD USED THE 'GANG BAR' TO DISENGAGE BOTH AUTOPLT SYS. AS WE WERE CLBING OUT, THE CAPT (PF) SELECTED THE 'A' AUTOPLT. THE ACFT WAS TRIMMED AND STABLE. AS WE APCHED OUR ASSIGNED ALT I NOTICED THE ACFT RATE OF CLB WAS NOT DECREASING. I ASKED THE CAPT IF THE ACFT WAS GOING TO LEVEL OFF. HE IMMEDIATELY TOOK CTL OF THE ACFT AND LEVELED AS BEST HE COULD, BUT DUE TO OUR HIGH RATE OF CLB, WE LEVELED APPROX 300 FT HIGH. WE CORRECTED TO ALT ASAP.
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.