Air carrier medium large transport altitude deviation non adherence to ATC clearance. Flight crew allowed aircraft to climb above cruise altitude after descent was started to reduce airspeed. PIC turned off mode C to prevent any problem with ZFW.

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Attributes
ACN	95089
Time
Date	198809
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : buj airport : dfw
State Reference	TX
Altitude	msl bound lower : 24000 msl bound upper : 24500
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zfw tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 5000 flight time type : 1500
ASRS Report	95089
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : undershoot non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The first officer was flying. With a clearance to descend to 11000'. He started out of 24000 using the vertical speed mode. We were descending at about 500 FPM. Center asked us to slow to 280 (were at 320). The first officer switched to IAS (airspeed) mode and rolled the thumb wheel back to 280 KIAS. The aircraft climbed to 24500' before reaching 280 KIAS and beginning to descend. I turned off the mode C at 24300 and back on after descending below 24000'. The first officer had about 350 hours in type and had been doing a super job. He just didn't understand what the aircraft would do after the mode switch.

Original NASA ASRS Text

Title: ACR MLG ALT DEVIATION NON ADHERENCE TO ATC CLRNC. FLT CREW ALLOWED ACFT TO CLIMB ABOVE CRUISE ALT AFTER DESCENT WAS STARTED TO REDUCE AIRSPEED. PIC TURNED OFF MODE C TO PREVENT ANY PROBLEM WITH ZFW.

Narrative: THE F/O WAS FLYING. WITH A CLRNC TO DSND TO 11000'. HE STARTED OUT OF 24000 USING THE VERTICAL SPD MODE. WE WERE DSNDING AT ABOUT 500 FPM. CTR ASKED US TO SLOW TO 280 (WERE AT 320). THE F/O SWITCHED TO IAS (AIRSPD) MODE AND ROLLED THE THUMB WHEEL BACK TO 280 KIAS. THE ACFT CLBED TO 24500' BEFORE REACHING 280 KIAS AND BEGINNING TO DSND. I TURNED OFF THE MODE C AT 24300 AND BACK ON AFTER DSNDING BELOW 24000'. THE F/O HAD ABOUT 350 HOURS IN TYPE AND HAD BEEN DOING A SUPER JOB. HE JUST DIDN'T UNDERSTAND WHAT THE ACFT WOULD DO AFTER THE MODE SWITCH.

Data retrieved from NASA's ASRS site as of August 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.