Heavy crew, at leveloff, overshot assigned altitude.

Attributes
ACN	496480
Time
Date	200012
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : rjoo.airport
State Reference	FO
Altitude	msl bound lower : 35000 msl bound upper : 35300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : rjtg.artcc
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : rjtg.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	cruise : level cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 13000 flight time type : 400
ASRS Report	496480
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : company policies non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Miss Distance	horizontal : 12000 vertical : 2000
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At leveloff, with autoplt on, aircraft overshot assigned altitude by 300 ft. We were assigned FL350, aircraft leveled at FL353. ATC advised traffic opposite direction at FL370. We immediately corrected to FL350. There was never any loss of minimum separation. We saw the autoplt starting to level off and assumed it would level at FL350. We could have been more aggressive shutting off autoplt and forcing the airplane down to FL350.

Original NASA ASRS Text

Title: HVY CREW, AT LEVELOFF, OVERSHOT ASSIGNED ALT.

Narrative: AT LEVELOFF, WITH AUTOPLT ON, ACFT OVERSHOT ASSIGNED ALT BY 300 FT. WE WERE ASSIGNED FL350, ACFT LEVELED AT FL353. ATC ADVISED TFC OPPOSITE DIRECTION AT FL370. WE IMMEDIATELY CORRECTED TO FL350. THERE WAS NEVER ANY LOSS OF MINIMUM SEPARATION. WE SAW THE AUTOPLT STARTING TO LEVEL OFF AND ASSUMED IT WOULD LEVEL AT FL350. WE COULD HAVE BEEN MORE AGGRESSIVE SHUTTING OFF AUTOPLT AND FORCING THE AIRPLANE DOWN TO FL350.

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.