Shortly after takeoff from dtw air carrier X receives TCASII RA and spots a grumman gulfstream below on the left side. PIC believes the aircraft departed on the right parallel runway and crossed below his aircraft.

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Attributes
ACN	404516
Time
Date	199806
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	agl bound lower : 1100 agl bound upper : 1100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dtw
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Make Model Name	Gulfstream II
Operating Under FAR Part	other : unknown
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 : 10 flight time total : 14000 flight time type : 2000
ASRS Report	404516
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 0 vertical : 250
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Heading 200 degrees after takeoff from runway 21C dtw at 1100 ft we received a TCASII RA 'climb, climb, climb.' the TCASII radar showed a target 200 ft directly below us. Looking out my left side window, I saw a grumman gulfstream jet moving away from our aircraft to the left. His altitude appeared to be 200-300 ft below us. I asked the tower about the traffic. We were switched to departure control at that time. The gulfstream, had to my knowledge, taken off from runway 21R. We did not see the grumman prior to the TCASII RA.

Original NASA ASRS Text

Title: SHORTLY AFTER TKOF FROM DTW ACR X RECEIVES TCASII RA AND SPOTS A GRUMMAN GULFSTREAM BELOW ON THE L SIDE. PIC BELIEVES THE ACFT DEPARTED ON THE R PARALLEL RWY AND CROSSED BELOW HIS ACFT.

Narrative: HDG 200 DEGS AFTER TKOF FROM RWY 21C DTW AT 1100 FT WE RECEIVED A TCASII RA 'CLB, CLB, CLB.' THE TCASII RADAR SHOWED A TARGET 200 FT DIRECTLY BELOW US. LOOKING OUT MY L SIDE WINDOW, I SAW A GRUMMAN GULFSTREAM JET MOVING AWAY FROM OUR ACFT TO THE L. HIS ALT APPEARED TO BE 200-300 FT BELOW US. I ASKED THE TWR ABOUT THE TFC. WE WERE SWITCHED TO DEP CTL AT THAT TIME. THE GULFSTREAM, HAD TO MY KNOWLEDGE, TAKEN OFF FROM RWY 21R. WE DID NOT SEE THE GRUMMAN PRIOR TO THE 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.