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A cessna 56X (new model) was inadvertently stalled during a high altitude manufacturer demonstration flight and recovered below the block altitude assigned. An ATP pilot in the right seat was being instructed to slow fly the aircraft when it stalled and the captain took over and recovered. Attempt to notify immediately was fouled by a radio communication problem.
| Attributes | |
| ACN | 424610 |
| Time | |
| Date | 199901 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lbl |
| State Reference | KS |
| Altitude | msl bound lower : 42000 msl bound upper : 43000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ord |
| Operator | general aviation : corporate |
| Make Model Name | Cessna Citation Undifferentiated or Other Model |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 150 flight time total : 7000 flight time type : 150 |
| ASRS Report | 424610 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer observation : observer |
| Experience | flight time last 90 days : 150 flight time total : 4800 flight time type : 160 |
| ASRS Report | 425069 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During a pilot demonstration flight at FL450 I was requested to demonstrate low speed handling at altitude. The prospect pilot was flying. I allowed speed to degrade too much and a stall was encountered. I had blocked airspace from FL430-FL450. We deviated below FL430 recovering from the stall. An immediate climb back to FL430 was made. I attempted to contact center, but was unable to do so immediately. We had encountered some intermittent radio problems earlier in the flight and apparently surfaced again. After several tries, I contacted center and reported level at FL430. During this time no receptions or xmissions made.
Original NASA ASRS Text
Title: A CESSNA 56X (NEW MODEL) WAS INADVERTENTLY STALLED DURING A HIGH ALT MANUFACTURER DEMONSTRATION FLT AND RECOVERED BELOW THE BLOCK ALT ASSIGNED. AN ATP PLT IN THE R SEAT WAS BEING INSTRUCTED TO SLOW FLY THE ACFT WHEN IT STALLED AND THE CAPT TOOK OVER AND RECOVERED. ATTEMPT TO NOTIFY IMMEDIATELY WAS FOULED BY A RADIO COM PROB.
Narrative: DURING A PLT DEMONSTRATION FLT AT FL450 I WAS REQUESTED TO DEMONSTRATE LOW SPD HANDLING AT ALT. THE PROSPECT PLT WAS FLYING. I ALLOWED SPD TO DEGRADE TOO MUCH AND A STALL WAS ENCOUNTERED. I HAD BLOCKED AIRSPACE FROM FL430-FL450. WE DEVIATED BELOW FL430 RECOVERING FROM THE STALL. AN IMMEDIATE CLB BACK TO FL430 WAS MADE. I ATTEMPTED TO CONTACT CTR, BUT WAS UNABLE TO DO SO IMMEDIATELY. WE HAD ENCOUNTERED SOME INTERMITTENT RADIO PROBS EARLIER IN THE FLT AND APPARENTLY SURFACED AGAIN. AFTER SEVERAL TRIES, I CONTACTED CTR AND RPTED LEVEL AT FL430. DURING THIS TIME NO RECEPTIONS OR XMISSIONS MADE.
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.