The flight crew of a widebody transport cargo aircraft descended below the assigned altitude while on vectors to the final approach fix. The captain (PF) discovered the deviation and returned to the assigned altitude.

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Attributes
ACN	325949
Time
Date	199601
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : ind
State Reference	IN
Altitude	msl bound lower : 5700 msl bound upper : 6000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute : on vectors enroute airway : zid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 15000 flight time type : 500
ASRS Report	325949
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
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 intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Autoplt failed to capture level off altitude on descent. Deviated 300 ft. Returned to altitude with no further problems. High terminal workload all 3 crew missed deviation until picked up by captain.

Original NASA ASRS Text

Title: THE FLC OF A WDB CARGO ACFT DSNDED BELOW THE ASSIGNED ALT WHILE ON VECTORS TO THE FINAL APCH FIX. THE CAPT (PF) DISCOVERED THE DEV AND RETURNED TO THE ASSIGNED ALT.

Narrative: AUTOPLT FAILED TO CAPTURE LEVEL OFF ALT ON DSCNT. DEVIATED 300 FT. RETURNED TO ALT WITH NO FURTHER PROBS. HIGH TERMINAL WORKLOAD ALL 3 CREW MISSED DEV UNTIL PICKED UP BY CAPT.

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.