D328 crew descended aircraft in response to a TCASII RA that directed a climb in mke class east.

Attributes
ACN	579903
Time
Date	200304
Day	Thu
Local Time Of Day	0601 To 1200
Place
State Reference	WI
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : mke.tracon
Operator	common carrier : air carrier
Make Model Name	Do 328 TP (Turboprop)
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : mke.tracon
Make Model Name	Learjet 60
Flight Phase	climbout : intermediate altitude cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 5500 flight time type : 525
ASRS Report	579903
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : far non adherence : company policies other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 500 vertical : 500
Supplementary
Problem Areas	Flight Crew Human Performance Company ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We had departed at XA00 am from grb. Our destination was mke. We were sbound at approximately 10000 ft MSL and in contact with milwaukee ATC when an RA suddenly popped up on our TCASII. It was climbing and we were flying straight and level. At approximately 3 mi indicated on TCASII, I disconnected the autoplt in anticipation of an evasive maneuver. The TCASII said to climb, but the screen indicated that the target was climbing to, or at altitude and leveling. I immediately began a descent and reduced power. My first officer and I saw a learjet pass approximately 500 ft over us going in the opposite direction. If we had been in IMC and unable to see the lear, I doubt that I would be writing this report based on the TCASII RA!

Original NASA ASRS Text

Title: D328 CREW DSNDED ACFT IN RESPONSE TO A TCASII RA THAT DIRECTED A CLB IN MKE CLASS E.

Narrative: WE HAD DEPARTED AT XA00 AM FROM GRB. OUR DEST WAS MKE. WE WERE SBOUND AT APPROX 10000 FT MSL AND IN CONTACT WITH MILWAUKEE ATC WHEN AN RA SUDDENLY POPPED UP ON OUR TCASII. IT WAS CLBING AND WE WERE FLYING STRAIGHT AND LEVEL. AT APPROX 3 MI INDICATED ON TCASII, I DISCONNECTED THE AUTOPLT IN ANTICIPATION OF AN EVASIVE MANEUVER. THE TCASII SAID TO CLB, BUT THE SCREEN INDICATED THAT THE TARGET WAS CLBING TO, OR AT ALT AND LEVELING. I IMMEDIATELY BEGAN A DSCNT AND REDUCED PWR. MY FO AND I SAW A LEARJET PASS APPROX 500 FT OVER US GOING IN THE OPPOSITE DIRECTION. IF WE HAD BEEN IN IMC AND UNABLE TO SEE THE LEAR, I DOUBT THAT I WOULD BE WRITING THIS RPT BASED ON 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.