Flight crew of a swearingen SA227 metropolitan III overshot assigned altitude, during en route altitude change, due to both crew members believing that they had been assigned the higher altitude, particularly since it coincided with the direction of flight.

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Attributes
ACN	484201
Time
Date	200009
Day	Mon
Local Time Of Day	1201 To 1800
Place
State Reference	MT
Altitude	msl bound lower : 20000 msl bound upper : 21000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	common carrier : air carrier
Make Model Name	SA-227 AC Metro III
Operating Under FAR Part	Part 135
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 95 flight time total : 7000 flight time type : 500
ASRS Report	484201
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Consequence	faa : assigned or threatened penalties
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Asked for block FL190 through FL210 which is proper for eastbound IFR. PNF read back FL190 through FL210 and set in alerter. Center claimed they had only cleared us from FL190 to FL200 and that we had busted FL200.

Original NASA ASRS Text

Title: FLC OF A SWEARINGEN SA227 METRO III OVERSHOT ASSIGNED ALT, DURING ENRTE ALT CHANGE, DUE TO BOTH CREW MEMBERS BELIEVING THAT THEY HAD BEEN ASSIGNED THE HIGHER ALT, PARTICULARLY SINCE IT COINCIDED WITH THE DIRECTION OF FLT.

Narrative: ASKED FOR BLOCK FL190 THROUGH FL210 WHICH IS PROPER FOR EBOUND IFR. PNF READ BACK FL190 THROUGH FL210 AND SET IN ALERTER. CTR CLAIMED THEY HAD ONLY CLRED US FROM FL190 TO FL200 AND THAT WE HAD BUSTED FL200.

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.