A departing air carrier is issued traffic, receives a TCASII RA, and descends.

Attributes
ACN	201149
Time
Date	199202
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bdl
State Reference	CT
Altitude	msl bound lower : 4600 msl bound upper : 5500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bdl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : initial
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	201149
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 900
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X departed runway 24. Departure control issued heading of 330 maintain 5000. Departure control issued unknown traffic 12 O'clock 5 mi swbound altitude indicates 5500 unverified. Air carrier X requested turn around unknown aircraft. I issued 020 heading. Air carrier X advised TCASII was instructing them to descend reference unknown aircraft. Air carrier X complied with TCASII and deviation from assigned altitude by 400 ft. At no point was separation ever lost.

Original NASA ASRS Text

Title: A DEPARTING ACR IS ISSUED TFC, RECEIVES A TCASII RA, AND DSNDS.

Narrative: ACR X DEPARTED RWY 24. DEP CTL ISSUED HDG OF 330 MAINTAIN 5000. DEP CTL ISSUED UNKNOWN TFC 12 O'CLOCK 5 MI SWBOUND ALT INDICATES 5500 UNVERIFIED. ACR X REQUESTED TURN AROUND UNKNOWN ACFT. I ISSUED 020 HDG. ACR X ADVISED TCASII WAS INSTRUCTING THEM TO DSND REF UNKNOWN ACFT. ACR X COMPLIED WITH TCASII AND DEV FROM ASSIGNED ALT BY 400 FT. AT NO POINT WAS SEPARATION EVER LOST.

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.