Near midair collision. Flight crew of an MD88 stopped descent and climbed in response to a TCASII RA during an arrival STAR. The other aircraft, a twin engine commuter, passed 200 ft underneath their aircraft.

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Attributes
ACN	407647
Time
Date	199807
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mad airport : bdl
State Reference	CT
Altitude	msl bound lower : 10800 msl bound upper : 11300
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : bed
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : bdl
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 4500
ASRS Report	407647
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

On hartford approach control deer park arrival (DPK2), approach instructed us to descend from 11000 ft to 10000 ft. Leaving 10800 ft TCASII gave us a TA and then quickly gave us an RA with immediate climb command. We commenced climb and advised ATC leveling at 11300 ft and watched a twin commuter pass just under us. ATC reported the traffic as level at 10500 ft just after the RA and our call to him.

Original NASA ASRS Text

Title: NMAC. FLC OF AN MD88 STOPPED DSCNT AND CLBED IN RESPONSE TO A TCASII RA DURING AN ARR STAR. THE OTHER ACFT, A TWIN ENG COMMUTER, PASSED 200 FT UNDERNEATH THEIR ACFT.

Narrative: ON HARTFORD APCH CTL DEER PARK ARR (DPK2), APCH INSTRUCTED US TO DSND FROM 11000 FT TO 10000 FT. LEAVING 10800 FT TCASII GAVE US A TA AND THEN QUICKLY GAVE US AN RA WITH IMMEDIATE CLB COMMAND. WE COMMENCED CLB AND ADVISED ATC LEVELING AT 11300 FT AND WATCHED A TWIN COMMUTER PASS JUST UNDER US. ATC RPTED THE TFC AS LEVEL AT 10500 FT JUST AFTER THE RA AND OUR CALL TO HIM.

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.