A flight crew in a GLF4 fails to catch a climb mode when a descent had been programmed while detouring thunderstorm activity in the area east of mia, fl.

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Attributes
ACN	475460
Time
Date	200006
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia.airport
State Reference	FL
Altitude	msl bound lower : 10000 msl bound upper : 17300
Environment
Flight Conditions	Marginal
Weather Elements	Thunderstorm Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia.tracon
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : vacating altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : multi engine
Experience	flight time total : 14000 flight time type : 1200
ASRS Report	475460
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : undershoot inflight encounter : turbulence inflight encounter : weather non adherence : clearance non adherence : published procedure other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : overrode automation flight crew : returned to original clearance
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance Weather Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were working miami approach at 16000 ft in thunderstorms and turbulence which made for a heavy workload. We were given a descent to 10000 ft. Right seat selected 10000 ft and I confirmed. I then selected 2000 FPM descent and went back to the radar as we were inbtwn numerous cells trying to deviate and work with approach on headings he was giving us. Neither of us felt any movement of the aircraft because of turbulence. A few seconds later at about the same time, we both saw and felt that we were climbing at a significant rate. I disconnected the autoplt and pushed the nose down, but by that time we had climbed about 1300 ft to 1500 ft. We have no idea what happened to cause this. Whether it was my error or equipment error we just don't know. Events were happening very quickly.

Original NASA ASRS Text

Title: A FLC IN A GLF4 FAILS TO CATCH A CLB MODE WHEN A DSCNT HAD BEEN PROGRAMMED WHILE DETOURING TSTM ACTIVITY IN THE AREA E OF MIA, FL.

Narrative: WE WERE WORKING MIAMI APCH AT 16000 FT IN TSTMS AND TURB WHICH MADE FOR A HVY WORKLOAD. WE WERE GIVEN A DSCNT TO 10000 FT. R SEAT SELECTED 10000 FT AND I CONFIRMED. I THEN SELECTED 2000 FPM DSCNT AND WENT BACK TO THE RADAR AS WE WERE INBTWN NUMEROUS CELLS TRYING TO DEVIATE AND WORK WITH APCH ON HEADINGS HE WAS GIVING US. NEITHER OF US FELT ANY MOVEMENT OF THE ACFT BECAUSE OF TURB. A FEW SECONDS LATER AT ABOUT THE SAME TIME, WE BOTH SAW AND FELT THAT WE WERE CLBING AT A SIGNIFICANT RATE. I DISCONNECTED THE AUTOPLT AND PUSHED THE NOSE DOWN, BUT BY THAT TIME WE HAD CLBED ABOUT 1300 FT TO 1500 FT. WE HAVE NO IDEA WHAT HAPPENED TO CAUSE THIS. WHETHER IT WAS MY ERROR OR EQUIP ERROR WE JUST DON'T KNOW. EVENTS WERE HAPPENING VERY QUICKLY.

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.