Air carrier X TCASII RA had less than standard separation from aircraft Y. System error. Evasive act...

Attributes
ACN	262909
Time
Date	199402
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bos
State Reference	MA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bos
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	cruise other
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 : 200 flight time total : 7000 flight time type : 2300
ASRS Report	262909
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Bos departure issued air carrier X turn to heading 040 degrees and a climb to 10000 ft. While in the turn, we received a TCASII TA. Approximately 3 second later we received a 'monitor vertical speed,' which instructed us to continue the climb at our present rate or greater. We visually saw the aircraft Y at our 1 O'clock position moving to our 2 O'clock position. The other aircraft Y told bos that they had a TCASII advisory and were following the RA advisory. We passed the aircraft Y and he appeared to be approximately 2 mi horizontal to our position and 500 ft below. Departure told us that we were diverging and our climb rate was sufficient.

Original NASA ASRS Text

Title: ACR X TCASII RA HAD LTSS FROM ACFT Y. SYS ERROR. EVASIVE ACTION TAKEN.

Narrative: BOS DEP ISSUED ACR X TURN TO HDG 040 DEGS AND A CLB TO 10000 FT. WHILE IN THE TURN, WE RECEIVED A TCASII TA. APPROX 3 SEC LATER WE RECEIVED A 'MONITOR VERT SPD,' WHICH INSTRUCTED US TO CONTINUE THE CLB AT OUR PRESENT RATE OR GREATER. WE VISUALLY SAW THE ACFT Y AT OUR 1 O'CLOCK POS MOVING TO OUR 2 O'CLOCK POS. THE OTHER ACFT Y TOLD BOS THAT THEY HAD A TCASII ADVISORY AND WERE FOLLOWING THE RA ADVISORY. WE PASSED THE ACFT Y AND HE APPEARED TO BE APPROX 2 MI HORIZ TO OUR POS AND 500 FT BELOW. DEP TOLD US THAT WE WERE DIVERGING AND OUR CLB RATE WAS SUFFICIENT.

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.

Air carrier X TCASII RA had less than standard separation from aircraft Y. System error. Evasive action taken.