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A DC9 experiences an altitude excursion after leveling off at FL290. The autoplt altitude hold function did not hold that altitude.
| Attributes | |
| ACN | 416510 |
| Time | |
| Date | 199810 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : tlh |
| State Reference | FL |
| Altitude | msl bound lower : 28500 msl bound upper : 29200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 7500 flight time type : 1800 |
| ASRS Report | 416510 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While climbing to FL290, I overshot leveloff by 200 ft. Then, after releveling off at FL290, the autoplt was re- engaged. The autoplt failed to hold FL290 and descended to FL285. The autoplt was disconnected, the airplane was hand flown to FL290, where the autoplt was rearmed and seemed to work the remainder of the flight. The air traffic controller reported the FL285 altitude. We reported our autoplt problem. Air traffic controller said there were no other aircraft in our area and gave us a block altitude FL280-FL290. We had no other problems with the autoplt.
Original NASA ASRS Text
Title: A DC9 EXPERIENCES AN ALT EXCURSION AFTER LEVELING OFF AT FL290. THE AUTOPLT ALT HOLD FUNCTION DID NOT HOLD THAT ALT.
Narrative: WHILE CLBING TO FL290, I OVERSHOT LEVELOFF BY 200 FT. THEN, AFTER RELEVELING OFF AT FL290, THE AUTOPLT WAS RE- ENGAGED. THE AUTOPLT FAILED TO HOLD FL290 AND DSNDED TO FL285. THE AUTOPLT WAS DISCONNECTED, THE AIRPLANE WAS HAND FLOWN TO FL290, WHERE THE AUTOPLT WAS REARMED AND SEEMED TO WORK THE REMAINDER OF THE FLT. THE AIR TFC CTLR RPTED THE FL285 ALT. WE RPTED OUR AUTOPLT PROB. AIR TFC CTLR SAID THERE WERE NO OTHER ACFT IN OUR AREA AND GAVE US A BLOCK ALT FL280-FL290. WE HAD NO OTHER PROBS WITH THE AUTOPLT.
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.