37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Attributes | |
ACN | 519170 |
Time | |
Date | 200107 |
Day | Wed |
Local Time Of Day | 0601 To 1200 |
Place | |
Locale Reference | airport : cvg.airport |
State Reference | KY |
Altitude | msl bound lower : 6700 msl bound upper : 7000 |
Environment | |
Flight Conditions | VMC |
Light | Daylight |
Aircraft 1 | |
Operator | common carrier : air carrier |
Make Model Name | MD-88 |
Flight Phase | descent : approach descent : intermediate altitude |
Flight Plan | IFR |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Qualification | pilot : cfi pilot : atp |
Experience | flight time last 90 days : 147 flight time total : 15000 flight time type : 1500 |
ASRS Report | 519170 |
Events | |
Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance non adherence : published procedure non adherence : company policies non adherence : far |
Resolutory Action | controller : issued new clearance |
Supplementary | |
Problem Areas | Aircraft Flight Crew Human Performance |
Primary Problem | Flight Crew Human Performance |
Air Traffic Incident | Pilot Deviation |
Narrative:
During descent to 7000 ft controller gave a speed reduction from 250 KTS to 180 KTS. MD88 has IAS mode that works fine, but system has this anomaly. If in 'altitude capture' mode, any adjustment to flight control panel will cancel altitude capture. I did not notice altitude capture when speed adjustment was made because FMA is in a different place than flight control panel. I knew that, but it got me anyway. Aircraft did not capture 7000 ft, and we descended to about 6700 ft before climb was established. After returning to 7000 ft, we were given 5000 ft almost immediately. There were no conflicts that I am aware of.
Original NASA ASRS Text
Title: MD88 CREW HAD AN ALT OVERSHOOT IN CVG CLASS B AIRSPACE.
Narrative: DURING DSCNT TO 7000 FT CTLR GAVE A SPD REDUCTION FROM 250 KTS TO 180 KTS. MD88 HAS IAS MODE THAT WORKS FINE, BUT SYS HAS THIS ANOMALY. IF IN 'ALT CAPTURE' MODE, ANY ADJUSTMENT TO FLT CTL PANEL WILL CANCEL ALT CAPTURE. I DID NOT NOTICE ALT CAPTURE WHEN SPD ADJUSTMENT WAS MADE BECAUSE FMA IS IN A DIFFERENT PLACE THAN FLT CTL PANEL. I KNEW THAT, BUT IT GOT ME ANYWAY. ACFT DID NOT CAPTURE 7000 FT, AND WE DSNDED TO ABOUT 6700 FT BEFORE CLB WAS ESTABLISHED. AFTER RETURNING TO 7000 FT, WE WERE GIVEN 5000 FT ALMOST IMMEDIATELY. THERE WERE NO CONFLICTS THAT I AM AWARE OF.
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.