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A descending MD88 gets into an overspeed condition and overshoots the assigned altitude while attempting to reduce airspeed by changes to the mode control panel near tigrr intersection, oh.
| Attributes | |
| ACN | 535783 |
| Time | |
| Date | 200201 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | intersection : tigrr |
| State Reference | OH |
| Altitude | msl bound lower : 10600 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6400 flight time type : 1050 |
| ASRS Report | 535783 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 175 |
| ASRS Report | 535547 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot inflight encounter : turbulence inflight encounter other other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : ovrspd wing other flight crewa other flight crewb |
| Resolutory Action | flight crew : overrode automation flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descent on arrival into cvg. First officer was pilot flying. WX was mixed (IMC, VMC) with chop on the descent clearance to cross tigrr at 11000 ft. Descent initiated in VNAV to 11000 ft. There was a 50-90 KT tailwind on the descent. Pilot flying briefed approach on the descent. VNAV was unable to control the descent and an overspd warning occurred approximately 4000 ft above level off at a high descent rate. Pilot flying transitioned to a vertical speed mode followed by an IAS descent mode to slow the aircraft. During these changes to the mode control panel the altitude captured. Unfortunately, the capture mode is disabled without any indication when a change is made to the mode control panel. At 1000 ft above the call was made and the excessive descent rate was noted. The pilot flying initially attempted to arrest the descent with vertical speed and then manually took over the aircraft. Altitude dropped 400 ft low before returning to 11000 ft. No conflicts were noted and no comment was made by ATC.
Original NASA ASRS Text
Title: A DESCENDING MD88 GETS INTO AN OVERSPEED CONDITION AND OVERSHOOTS THE ASSIGNED ALT WHILE ATTEMPTING TO REDUCE AIRSPEED BY CHANGES TO THE MODE CTL PANEL NEAR TIGRR INTXN, OH.
Narrative: DSCNT ON ARRIVAL INTO CVG. FIRST OFFICER WAS PLT FLYING. WX WAS MIXED (IMC, VMC) WITH CHOP ON THE DSCNT CLRNC TO CROSS TIGRR AT 11000 FT. DSCNT INITIATED IN VNAV TO 11000 FT. THERE WAS A 50-90 KT TAILWIND ON THE DSCNT. PLT FLYING BRIEFED APCH ON THE DSCNT. VNAV WAS UNABLE TO CTL THE DSCNT AND AN OVERSPD WARNING OCCURRED APPROX 4000 FT ABOVE LEVEL OFF AT A HIGH DSCNT RATE. PLT FLYING TRANSITIONED TO A VERTICAL SPD MODE FOLLOWED BY AN IAS DSCNT MODE TO SLOW THE ACFT. DURING THESE CHANGES TO THE MODE CTL PANEL THE ALT CAPTURED. UNFORTUNATELY, THE CAPTURE MODE IS DISABLED WITHOUT ANY INDICATION WHEN A CHANGE IS MADE TO THE MODE CTL PANEL. AT 1000 FT ABOVE THE CALL WAS MADE AND THE EXCESSIVE DSCNT RATE WAS NOTED. THE PLT FLYING INITIALLY ATTEMPTED TO ARREST THE DSCNT WITH VERTICAL SPD AND THEN MANUALLY TOOK OVER THE ACFT. ALT DROPPED 400 FT LOW BEFORE RETURNING TO 11000 FT. NO CONFLICTS WERE NOTED AND NO COMMENT WAS MADE BY ATC.
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.