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A cpr crew dealing with turbulence causing an overspeed and autoplt problem overshoot their descent altitude momentarily with no traffic conflict reported.
| Attributes | |
| ACN | 527450 |
| Time | |
| Date | 200110 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zny.artcc |
| State Reference | NY |
| Altitude | msl bound lower : 30600 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | Citation III, VI, VII |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 11000 flight time type : 625 |
| ASRS Report | 527450 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot inflight encounter : turbulence non adherence : clearance |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Descent to FL310 was being made at a higher rate than normal at ATC request when windshear gust activated the maximum speed feature of the autoplt. While the crew's attention was diverted to correcting the speed issue the aircraft passed through FL310. The altitude hold feature did not capture for some reason the altitude at FL310. The altitude alerter sounded at 300 ft past the set altitude of FL310 and the aircraft was immediately returned to FL310 with a maximum deviation of 400 ft. This was a very short deviation and there was apparently no traffic conflict. We were cleared for further descent almost immediately after leveling at FL310.
Original NASA ASRS Text
Title: A CPR CREW DEALING WITH TURB CAUSING AN OVERSPEED AND AUTOPLT PROBLEM OVERSHOOT THEIR DSCNT ALT MOMENTARILY WITH NO TRAFFIC CONFLICT REPORTED.
Narrative: DSCNT TO FL310 WAS BEING MADE AT A HIGHER RATE THAN NORMAL AT ATC REQUEST WHEN WINDSHEAR GUST ACTIVATED THE MAX SPEED FEATURE OF THE AUTOPLT. WHILE THE CREW'S ATTENTION WAS DIVERTED TO CORRECTING THE SPEED ISSUE THE ACFT PASSED THROUGH FL310. THE ALT HOLD FEATURE DID NOT CAPTURE FOR SOME REASON THE ALT AT FL310. THE ALT ALERTER SOUNDED AT 300 FT PAST THE SET ALT OF FL310 AND THE ACFT WAS IMMEDIATELY RETURNED TO FL310 WITH A MAX DEV OF 400 FT. THIS WAS A VERY SHORT DEV AND THERE WAS APPARENTLY NO TRAFFIC CONFLICT. WE WERE CLEARED FOR FURTHER DSCNT ALMOST IMMEDIATELY AFTER LEVELING AT FL310.
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.