Altitude deviation altitude overshot in descent.

Attributes
ACN	297861
Time
Date	199503
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iah
State Reference	TX
Altitude	msl bound lower : 5750 msl bound upper : 6000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iah
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	297861
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	297860
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

On descent while flying struck 8 arrival into hou during a right turn to 220 degrees and using digital flight guidance system #1. The autoplt failed to level off at 6000 ft MSL. I was flying as first officer and made a standard call descending through 7000 ft MSL. Both fmas annunciated -- altitude cap -- but the aircraft descended through the altitude. At about the same time that I called out the situation, captain also noted the deviation and disconnected the autoplt and autothrottle. Descent was stopped at about 5750 ft MSL, and hand flown back up to 6000 ft. An FAA air carrier inspector witnessed the event from the cockpit jumpseat.

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT IN DSCNT.

Narrative: ON DSCNT WHILE FLYING STRUCK 8 ARR INTO HOU DURING A R TURN TO 220 DEGS AND USING DIGITAL FLT GUIDANCE SYS #1. THE AUTOPLT FAILED TO LEVEL OFF AT 6000 FT MSL. I WAS FLYING AS FO AND MADE A STANDARD CALL DSNDING THROUGH 7000 FT MSL. BOTH FMAS ANNUNCIATED -- ALT CAP -- BUT THE ACFT DSNDED THROUGH THE ALT. AT ABOUT THE SAME TIME THAT I CALLED OUT THE SIT, CAPT ALSO NOTED THE DEV AND DISCONNECTED THE AUTOPLT AND AUTOTHROTTLE. DSCNT WAS STOPPED AT ABOUT 5750 FT MSL, AND HAND FLOWN BACK UP TO 6000 FT. AN FAA ACR INSPECTOR WITNESSED THE EVENT FROM THE COCKPIT JUMPSEAT.

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.