A DC9 flight crew received a TCASII RA on departure from grb.

Attributes
ACN	450640
Time
Date	199909
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : grb.airport
State Reference	WI
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : grb.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 50
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : grb.tracon
Operator	common carrier : air taxi
Make Model Name	Twin Beech 18
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Route In Use	arrival : vfr
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 14000 flight time type : 1800
ASRS Report	450640
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took precautionary avoidance action
Miss Distance	horizontal : 6000 vertical : 200
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft X departed grb runway 18 en route to dtw. Initial clearance was 'runway heading, maintain 4000 ft.' upon check in with approach/departure control, was cleared to climb to 10000 ft and turn direct to fah VOR (falls VOR), heading was approximately 165 degrees. After this clearance was received, another aircraft (aircraft Y) turbo beech 18 checked in with approach, coming from the south for a practice approach and landing. Aircraft Y was at 8000 ft. Grb departure directed us to fly a heading of 110 degrees for the climb. While turning to 110 degrees, aircraft Y reported visual contact with our aircraft. Grb cleared them to maintain visual contact with us and cleared for visual approach to grb. I sighted the BE18T at this time at my 2 O'clock position on apparent collision course. Turned on all lights and transmitted on radio to aircraft Y not to descend. Also, received RA commanding descent in excess of 2000 FPM. First officer started descent and descended approximately 1000 ft until conflict past. Vectors from grb approach placed these 2 aircraft in conflict. Also, had this occurred in daylight, probably would not have seen other aircraft as soon as we did.

Original NASA ASRS Text

Title: A DC9 FLC RECEIVED A TCASII RA ON DEP FROM GRB.

Narrative: ACFT X DEPARTED GRB RWY 18 ENRTE TO DTW. INITIAL CLRNC WAS 'RWY HDG, MAINTAIN 4000 FT.' UPON CHK IN WITH APCH/DEP CTL, WAS CLRED TO CLB TO 10000 FT AND TURN DIRECT TO FAH VOR (FALLS VOR), HDG WAS APPROX 165 DEGS. AFTER THIS CLRNC WAS RECEIVED, ANOTHER ACFT (ACFT Y) TURBO BEECH 18 CHKED IN WITH APCH, COMING FROM THE S FOR A PRACTICE APCH AND LNDG. ACFT Y WAS AT 8000 FT. GRB DEP DIRECTED US TO FLY A HDG OF 110 DEGS FOR THE CLB. WHILE TURNING TO 110 DEGS, ACFT Y RPTED VISUAL CONTACT WITH OUR ACFT. GRB CLRED THEM TO MAINTAIN VISUAL CONTACT WITH US AND CLRED FOR VISUAL APCH TO GRB. I SIGHTED THE BE18T AT THIS TIME AT MY 2 O'CLOCK POS ON APPARENT COLLISION COURSE. TURNED ON ALL LIGHTS AND XMITTED ON RADIO TO ACFT Y NOT TO DSND. ALSO, RECEIVED RA COMMANDING DSCNT IN EXCESS OF 2000 FPM. FO STARTED DSCNT AND DSNDED APPROX 1000 FT UNTIL CONFLICT PAST. VECTORS FROM GRB APCH PLACED THESE 2 ACFT IN CONFLICT. ALSO, HAD THIS OCCURRED IN DAYLIGHT, PROBABLY WOULD NOT HAVE SEEN OTHER ACFT AS SOON AS WE DID.

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.