Large transport TCASII TA RA with climbing B737. Evasive action taken. Large transport altitude deviation when descending back to assigned altitude.

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Attributes
ACN	294080
Time
Date	199501
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dxo
State Reference	MI
Altitude	msl bound lower : 10800 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : btv
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute airway : dtw
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 173 flight time total : 13265 flight time type : 250
ASRS Report	294080
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

First officer was flying the polar 1 arrival to dtw, maintaining 11000 ft with autoplt on. He was on the dtw 343 degree radial at 12 DME approaching traml intersection at 10 DME when we had a TCASII TA. We looked outside and saw an aircraft below our altitude at 11 O'clock position climbing. After we had a visual with the traffic we had a TCASII RA to climb. First officer disengaged autoplt and started to climb and at 11200 ft TCASII said to monitor vertical speed followed by 'clear of conflict.' first officer then began descent back to 11000 ft (cleared altitude prior to TCASII alert) but descended to 10800 ft and corrected back to 11000 ft. So confirmed aircraft that we had the TCASII RA for was a 737/300. I believe that the 737 had been cleared to 10000 ft and it was the 737's rate of climb that caused us to have a TCASII RA. We advised dtw approach control that we deviated from our altitude because we had reacted to a TCASII RA.

Original NASA ASRS Text

Title: LGT TCASII TA RA WITH CLBING B737. EVASIVE ACTION TAKEN. LGT ALTDEV WHEN DSNDING BACK TO ASSIGNED ALT.

Narrative: FO WAS FLYING THE POLAR 1 ARR TO DTW, MAINTAINING 11000 FT WITH AUTOPLT ON. HE WAS ON THE DTW 343 DEG RADIAL AT 12 DME APCHING TRAML INTXN AT 10 DME WHEN WE HAD A TCASII TA. WE LOOKED OUTSIDE AND SAW AN ACFT BELOW OUR ALT AT 11 O'CLOCK POS CLBING. AFTER WE HAD A VISUAL WITH THE TFC WE HAD A TCASII RA TO CLB. FO DISENGAGED AUTOPLT AND STARTED TO CLB AND AT 11200 FT TCASII SAID TO MONITOR VERT SPD FOLLOWED BY 'CLR OF CONFLICT.' FO THEN BEGAN DSCNT BACK TO 11000 FT (CLRED ALT PRIOR TO TCASII ALERT) BUT DSNDED TO 10800 FT AND CORRECTED BACK TO 11000 FT. SO CONFIRMED ACFT THAT WE HAD THE TCASII RA FOR WAS A 737/300. I BELIEVE THAT THE 737 HAD BEEN CLRED TO 10000 FT AND IT WAS THE 737'S RATE OF CLB THAT CAUSED US TO HAVE A TCASII RA. WE ADVISED DTW APCH CTL THAT WE DEVIATED FROM OUR ALT BECAUSE WE HAD REACTED TO A TCASII RA.

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.