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First officer of an MD88 overshot descent assigned altitude during a STAR arrival due to the #2 autoplt did not capture the altitude. The captain disengaged the autoplt and returned to assigned.
| Attributes | |
| ACN | 414286 |
| Time | |
| Date | 199809 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cqy airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 10700 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : dfw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 13000 flight time type : 3000 |
| ASRS Report | 414286 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6500 flight time type : 10 |
| ASRS Report | 414010 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera 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:
I was the captain and PNF on sep/xa/98 mlu-dfw. We were descending into dfw on the cedar creek 2 arrival. We were descending to cross tacke intersection at 11000 ft MSL with the #2 autoplt engaged in IAS mode. Approaching leveloff altitude, the FMA panel annunciated altitude capture. The aircraft did not level off and the PF immediately selected altitude hold. The aircraft continued to descend, at which point I took control of the aircraft and manually flew back to 11000 ft. I re-engaged the autoplt and selected altitude hold. The aircraft began to descend again. I disconnected the autoplt, selected the #1 autoplt (#1 dfgc), re-engaged the autoplt, selected altitude hold and the autoplt functioned normally. During the course of this event, our minimum altitude was 10700 ft MSL. We received a call from dfw approach with a reminder that our cleared altitude was 11000 ft and he repeated the current altimeter setting. At the time we received this call, we were climbing back to 11000 ft. On arrival at the gate in dfw, dfw maintenance was called via radio and informed of the autoplt malfunction. An entry was made in the aircraft logbook.
Original NASA ASRS Text
Title: FO OF AN MD88 OVERSHOT DSCNT ASSIGNED ALT DURING A STAR ARR DUE TO THE #2 AUTOPLT DID NOT CAPTURE THE ALT. THE CAPT DISENGAGED THE AUTOPLT AND RETURNED TO ASSIGNED.
Narrative: I WAS THE CAPT AND PNF ON SEP/XA/98 MLU-DFW. WE WERE DSNDING INTO DFW ON THE CEDAR CREEK 2 ARR. WE WERE DSNDING TO CROSS TACKE INTXN AT 11000 FT MSL WITH THE #2 AUTOPLT ENGAGED IN IAS MODE. APCHING LEVELOFF ALT, THE FMA PANEL ANNUNCIATED ALT CAPTURE. THE ACFT DID NOT LEVEL OFF AND THE PF IMMEDIATELY SELECTED ALT HOLD. THE ACFT CONTINUED TO DSND, AT WHICH POINT I TOOK CTL OF THE ACFT AND MANUALLY FLEW BACK TO 11000 FT. I RE-ENGAGED THE AUTOPLT AND SELECTED ALT HOLD. THE ACFT BEGAN TO DSND AGAIN. I DISCONNECTED THE AUTOPLT, SELECTED THE #1 AUTOPLT (#1 DFGC), RE-ENGAGED THE AUTOPLT, SELECTED ALT HOLD AND THE AUTOPLT FUNCTIONED NORMALLY. DURING THE COURSE OF THIS EVENT, OUR MINIMUM ALT WAS 10700 FT MSL. WE RECEIVED A CALL FROM DFW APCH WITH A REMINDER THAT OUR CLRED ALT WAS 11000 FT AND HE REPEATED THE CURRENT ALTIMETER SETTING. AT THE TIME WE RECEIVED THIS CALL, WE WERE CLBING BACK TO 11000 FT. ON ARR AT THE GATE IN DFW, DFW MAINT WAS CALLED VIA RADIO AND INFORMED OF THE AUTOPLT MALFUNCTION. AN ENTRY WAS MADE IN THE ACFT LOGBOOK.
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.