Altitude deviation altitude excursion.

Attributes
ACN	318610
Time
Date	199510
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : aug
State Reference	GA
Altitude	msl bound lower : 21000 msl bound upper : 21300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 17000 flight time type : 5000
ASRS Report	318610
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 900
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were level at FL210. Our TCASII commanded a climb RA. We had visual contact with the intruder and climbed to FL213. We contacted center and noticed the intruder at FL204 according to our TCASII. Center questioned his altitude, he responded FL200.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION.

Narrative: WE WERE LEVEL AT FL210. OUR TCASII COMMANDED A CLB RA. WE HAD VISUAL CONTACT WITH THE INTRUDER AND CLBED TO FL213. WE CONTACTED CTR AND NOTICED THE INTRUDER AT FL204 ACCORDING TO OUR TCASII. CTR QUESTIONED HIS ALT, HE RESPONDED 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.