TCAS induced altitude deviation near dtw.

Attributes
ACN	180807
Time
Date	199106
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : crl airport : dtw
State Reference	MI
Altitude	msl bound lower : 7250 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 160 flight time total : 17000
ASRS Report	180807
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude 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
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After takeoff from dtw and during climb out, ATC notified us to level at 8000', vector 150 degree heading. We did so. ATC stated small aircraft Y traffic was 10 mi at 12 O'clock at 8500'. We did not see the traffic, but noticed a blue diamond about that position on the TCAS indicator. The blue diamond disappeared about 30 seconds later and shortly after a 30 degree left vector to 120 degree heading was given by ATC. Shortly thereafter it appeared at 3 O'clock and 1/2 mi at +300' above us. The TCAS then went to an RA of descend over 2000 FPM with all warnings and alarms. We did so immediately and lost 750' before small aircraft Y was spotted by the copilot on our right side. The captain never saw the TCAS target. A normal climb was made back to 8000' and detroit-cleveland ATC was advised. Normal vectors were then given to on course from our 120 degree assigned heading west/O further incident.

Original NASA ASRS Text

Title: TCAS INDUCED ALT DEVIATION NEAR DTW.

Narrative: AFTER TKOF FROM DTW AND DURING CLBOUT, ATC NOTIFIED US TO LEVEL AT 8000', VECTOR 150 DEG HDG. WE DID SO. ATC STATED SMA Y TFC WAS 10 MI AT 12 O'CLOCK AT 8500'. WE DID NOT SEE THE TFC, BUT NOTICED A BLUE DIAMOND ABOUT THAT POS ON THE TCAS INDICATOR. THE BLUE DIAMOND DISAPPEARED ABOUT 30 SECS LATER AND SHORTLY AFTER A 30 DEG LEFT VECTOR TO 120 DEG HDG WAS GIVEN BY ATC. SHORTLY THEREAFTER IT APPEARED AT 3 O'CLOCK AND 1/2 MI AT +300' ABOVE US. THE TCAS THEN WENT TO AN RA OF DSND OVER 2000 FPM WITH ALL WARNINGS AND ALARMS. WE DID SO IMMEDIATELY AND LOST 750' BEFORE SMA Y WAS SPOTTED BY THE COPLT ON OUR RIGHT SIDE. THE CAPT NEVER SAW THE TCAS TARGET. A NORMAL CLB WAS MADE BACK TO 8000' AND DETROIT-CLEVELAND ATC WAS ADVISED. NORMAL VECTORS WERE THEN GIVEN TO ON COURSE FROM OUR 120 DEG ASSIGNED HDG W/O FURTHER INCIDENT.

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.