A cpr twin jet first officer overshoots his assigned altitude when attempting a speed change using the flight director command bars northeast of bro, tx.

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Attributes
ACN	470610
Time
Date	200004
Day	Tue
Local Time Of Day	0601 To 1200
Place
State Reference	TX
Altitude	msl bound lower : 9000 msl bound upper : 9600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors enroute airway : ns.airway
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 15250 flight time type : 250
ASRS Report	470610
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure Aircraft ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departing bro, ATC instructed 'cancel speed restr.' we had not been given a speed restr, so we asked ATC if we had been given one. ATC advised us of a special test program, whereby aircraft operating below 10000 ft MSL were able to operate at greater than 250 KTS if cleared by ATC. At the time of the clearance, we were climbing to 9000 ft assigned at 250 KTS using a preset climb schedule in the FMS. I attempted to increase speed of aircraft by lowering nose, but because of the preset speeds in FMS the command bars on the pilots ADI commanded an increase climb pitch to bring down the airspeed. Instinctively I brought the nose back up to match the command bars. At about the same time I matched pitch with command bars, they suddenly dropped. Because the altitude select feature was tripped on by rapidly approaching our assigned altitude of 9000 ft, I was unable to match the new position of the command bars because of excessive negative 'G' loads. By the time I had completed the recovery maneuver, the aircraft had gone through the assigned altitude by 600 ft (9600 ft). We returned to our assigned altitude. ATC did not seem to notice.

Original NASA ASRS Text

Title: A CPR TWIN JET FO OVERSHOOTS HIS ASSIGNED ALT WHEN ATTEMPTING A SPD CHANGE USING THE FLT DIRECTOR COMMAND BARS NE OF BRO, TX.

Narrative: DEPARTING BRO, ATC INSTRUCTED 'CANCEL SPD RESTR.' WE HAD NOT BEEN GIVEN A SPD RESTR, SO WE ASKED ATC IF WE HAD BEEN GIVEN ONE. ATC ADVISED US OF A SPECIAL TEST PROGRAM, WHEREBY ACFT OPERATING BELOW 10000 FT MSL WERE ABLE TO OPERATE AT GREATER THAN 250 KTS IF CLRED BY ATC. AT THE TIME OF THE CLRNC, WE WERE CLBING TO 9000 FT ASSIGNED AT 250 KTS USING A PRESET CLB SCHEDULE IN THE FMS. I ATTEMPTED TO INCREASE SPD OF ACFT BY LOWERING NOSE, BUT BECAUSE OF THE PRESET SPDS IN FMS THE COMMAND BARS ON THE PLTS ADI COMMANDED AN INCREASE CLB PITCH TO BRING DOWN THE AIRSPD. INSTINCTIVELY I BROUGHT THE NOSE BACK UP TO MATCH THE COMMAND BARS. AT ABOUT THE SAME TIME I MATCHED PITCH WITH COMMAND BARS, THEY SUDDENLY DROPPED. BECAUSE THE ALT SELECT FEATURE WAS TRIPPED ON BY RAPIDLY APCHING OUR ASSIGNED ALT OF 9000 FT, I WAS UNABLE TO MATCH THE NEW POS OF THE COMMAND BARS BECAUSE OF EXCESSIVE NEGATIVE 'G' LOADS. BY THE TIME I HAD COMPLETED THE RECOVERY MANEUVER, THE ACFT HAD GONE THROUGH THE ASSIGNED ALT BY 600 FT (9600 FT). WE RETURNED TO OUR ASSIGNED ALT. ATC DID NOT SEEM TO NOTICE.

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.