Reporter's aircraft X left assigned altitude in response to a TCASII alert involved aircraft Y.

Attributes
ACN	441508
Time
Date	199906
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : bkw.vortac
State Reference	WV
Altitude	msl bound lower : 32400 msl bound upper : 33000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level
Route In Use	enroute airway : j42.airway
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	441508
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	441509
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action flight crew : returned to assigned altitude
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

RA alert received at XA10Z, 65 mi west of bwk VOR on radar vectors, ZID at FL330. Complied with RA alert and descended to FL324. When clear of conflict alert received, returned to FL330. ZID was advised of deviation and RA alert and return to flight level.

Original NASA ASRS Text

Title: RPTR'S ACFT X LEFT ASSIGNED ALT IN RESPONSE TO A TCASII ALERT INVOLVED ACFT Y.

Narrative: RA ALERT RECEIVED AT XA10Z, 65 MI W OF BWK VOR ON RADAR VECTORS, ZID AT FL330. COMPLIED WITH RA ALERT AND DSNDED TO FL324. WHEN CLR OF CONFLICT ALERT RECEIVED, RETURNED TO FL330. ZID WAS ADVISED OF DEV AND RA ALERT AND RETURN TO FLT LEVEL.

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.