 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737-300 crew had the captain's pfd attitude indicator fail. The #1 autoplt, which references that system, climbed the aircraft before the crew could disconnect it.
| Attributes | |
| ACN | 586136 |
| Time | |
| Date | 200306 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | CO |
| Altitude | msl bound lower : 33000 msl bound upper : 33200 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc tower : jfk.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| ASRS Report | 586136 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : pfd, altimeter other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : overrode automation none taken : detected after the fact |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During cruise flight at FL330 with the a autoplt engaged, the captain's vertical speed indicator slewed to full descent. The aircraft then began a climb. The crew noticed the deviation when 200 ft above assigned altitude of FL330. The captain disconnected the autoplt and stopped the climb before reaching 300 ft above altitude. The aircraft was then returned to FL330. No human factors were involved.
Original NASA ASRS Text
Title: B737-300 CREW HAD THE CAPT'S PFD ATTITUDE INDICATOR FAIL. THE #1 AUTOPLT, WHICH REFS THAT SYS, CLBED THE ACFT BEFORE THE CREW COULD DISCONNECT IT.
Narrative: DURING CRUISE FLT AT FL330 WITH THE A AUTOPLT ENGAGED, THE CAPT'S VERT SPD INDICATOR SLEWED TO FULL DSCNT. THE ACFT THEN BEGAN A CLB. THE CREW NOTICED THE DEV WHEN 200 FT ABOVE ASSIGNED ALT OF FL330. THE CAPT DISCONNECTED THE AUTOPLT AND STOPPED THE CLB BEFORE REACHING 300 FT ABOVE ALT. THE ACFT WAS THEN RETURNED TO FL330. NO HUMAN FACTORS WERE INVOLVED.
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.