Altitude deviation altitude overshot in descent. Non adherence to ATC clearance.

Attributes
ACN	296337
Time
Date	199502
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 13650 msl bound upper : 14000
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star enroute airway : zau
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 2500
ASRS Report	296337
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During descent (pullman arrival) to ord, at about 14400 ft, a loud thump was both heard and felt. I immediately started checking all hydraulic and gear indications. The sound seemed to come from the nose gear area. Apparently the captain (who was flying) was also checking instruments. Before we realized it, we had gone through our assigned altitude by approximately 350 ft.

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT IN DSCNT. NON ADHERENCE TO ATC CLRNC.

Narrative: DURING DSCNT (PULLMAN ARR) TO ORD, AT ABOUT 14400 FT, A LOUD THUMP WAS BOTH HEARD AND FELT. I IMMEDIATELY STARTED CHKING ALL HYD AND GEAR INDICATIONS. THE SOUND SEEMED TO COME FROM THE NOSE GEAR AREA. APPARENTLY THE CAPT (WHO WAS FLYING) WAS ALSO CHKING INSTS. BEFORE WE REALIZED IT, WE HAD GONE THROUGH OUR ASSIGNED ALT BY APPROX 350 FT.

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.