A DC9 flight crew deviates by 200 ft during leveloff while in a turn.

Attributes
ACN	520430
Time
Date	200107
Day	Tue
Local Time Of Day	1201 To 1800
Place
State Reference	OH
Altitude	msl bound lower : 31000 msl bound upper : 31200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 8000 flight time type : 2400
ASRS Report	520430
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance other anomaly other
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

As we approached leveloff altitude of FL310, we were given a turn to proceed direct djb VOR. We were then instructed to turn further left just as we reached FL310. I (PF) hit the leveloff on the autoplt at the same time initiating a turn. The aircraft ballooned through FL310 by approximately 200 ft before stabilizing at FL310. Factors contributing to this incident were being given 2 different heading changes while at the same time reaching leveloff altitude. There was no traffic conflict and ATC made no mention of the event.

Original NASA ASRS Text

Title: A DC9 FLT CREW DEVIATES BY 200 FT DURING LEVELOFF WHILE IN A TURN.

Narrative: AS WE APCHED LEVELOFF ALT OF FL310, WE WERE GIVEN A TURN TO PROCEED DIRECT DJB VOR. WE WERE THEN INSTRUCTED TO TURN FURTHER L JUST AS WE REACHED FL310. I (PF) HIT THE LEVELOFF ON THE AUTOPLT AT THE SAME TIME INITIATING A TURN. THE ACFT BALLOONED THROUGH FL310 BY APPROX 200 FT BEFORE STABILIZING AT FL310. FACTORS CONTRIBUTING TO THIS INCIDENT WERE BEING GIVEN 2 DIFFERENT HDG CHANGES WHILE AT THE SAME TIME REACHING LEVELOFF ALT. THERE WAS NO TFC CONFLICT AND ATC MADE NO MENTION OF THE EVENT.

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.