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DC9-30 flight crew incur autoplt problems and overshot delzy intersection crossing restr on the msp kaspr STAR. Autoplt overrides pilot, changing from 3000 FPM to 6000 FPM.
| Attributes | |
| ACN | 515300 |
| Time | |
| Date | 200106 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : delzy |
| State Reference | MN |
| Altitude | msl bound lower : 10400 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : kaspr 2 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 12000 flight time type : 2800 |
| ASRS Report | 515300 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : published procedure non adherence : clearance other anomaly |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : overrode automation flight crew : regained aircraft control |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Day VFR/VMC. Kaspr 2 arrival into msp. ATC said to descend (pilot's discretion) to FL240, cross delzy intersection at 11000 ft. Descent was planned using cockpit descent wheel, adjusted for wind and no speed reduction required. Autoplt had given us some problem on previous leg. The descent or vertical speed wheel was not giving the autoplt the requested amount of climb or descent. Also, the autoplt jerked the yoke often. When using autoplt earlier, it missed altitude leveloff by +/-100 ft to +/-200 ft. On the descent, using normal procedures, the autoplt was set to 3000 FPM descent, yet only did approximately 1000 ft. I increased the rate, but was already behind my descent profile. I added speed brakes and was able to increase rate to 4000-5000 FPM. The autoplt pitched over and the rate was 6000+ FPM rate of descent. Autoplt was turned off and I manually flew the aircraft. We/I overcompensated and we were high on our descent path. We crossed the required ('delzy') intersection at 11000 ft, but overshot to 10400 ft on captain's side, 10200 ft on first officer's side. We called ATC and notified them while climbing back up to 11000 ft. Autoplt was turned back on. I contacted msp TRACON upon landing and talked to supervisor. I also wrote up the autoplt and briefed maintenance.
Original NASA ASRS Text
Title: DC9-30 FLT CREW INCUR AUTOPLT PROBS AND OVERSHOT DELZY INTXN XING RESTR ON THE MSP KASPR STAR. AUTOPLT OVERRIDES PLT, CHANGING FROM 3000 FPM TO 6000 FPM.
Narrative: DAY VFR/VMC. KASPR 2 ARR INTO MSP. ATC SAID TO DSND (PLT'S DISCRETION) TO FL240, CROSS DELZY INTXN AT 11000 FT. DSCNT WAS PLANNED USING COCKPIT DSCNT WHEEL, ADJUSTED FOR WIND AND NO SPD REDUCTION REQUIRED. AUTOPLT HAD GIVEN US SOME PROB ON PREVIOUS LEG. THE DSCNT OR VERT SPD WHEEL WAS NOT GIVING THE AUTOPLT THE REQUESTED AMOUNT OF CLB OR DSCNT. ALSO, THE AUTOPLT JERKED THE YOKE OFTEN. WHEN USING AUTOPLT EARLIER, IT MISSED ALT LEVELOFF BY +/-100 FT TO +/-200 FT. ON THE DSCNT, USING NORMAL PROCS, THE AUTOPLT WAS SET TO 3000 FPM DSCNT, YET ONLY DID APPROX 1000 FT. I INCREASED THE RATE, BUT WAS ALREADY BEHIND MY DSCNT PROFILE. I ADDED SPD BRAKES AND WAS ABLE TO INCREASE RATE TO 4000-5000 FPM. THE AUTOPLT PITCHED OVER AND THE RATE WAS 6000+ FPM RATE OF DSCNT. AUTOPLT WAS TURNED OFF AND I MANUALLY FLEW THE ACFT. WE/I OVERCOMPENSATED AND WE WERE HIGH ON OUR DSCNT PATH. WE CROSSED THE REQUIRED ('DELZY') INTXN AT 11000 FT, BUT OVERSHOT TO 10400 FT ON CAPT'S SIDE, 10200 FT ON FO'S SIDE. WE CALLED ATC AND NOTIFIED THEM WHILE CLBING BACK UP TO 11000 FT. AUTOPLT WAS TURNED BACK ON. I CONTACTED MSP TRACON UPON LNDG AND TALKED TO SUPVR. I ALSO WROTE UP THE AUTOPLT AND BRIEFED MAINT.
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.