CL65 crew receive a TCASII RA alert to climb while flying at FL280 under ZAU control.

Attributes
ACN	577479
Time
Date	200303
Day	Tue
Local Time Of Day	0601 To 1200
Place
State Reference	OH
Altitude	msl single value : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Make Model Name	Commercial Fixed Wing
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 170 flight time total : 5480 flight time type : 3135
ASRS Report	574479
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : radar mode c aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude flight crew : took evasive action flight crew : took precautionary avoidance action
Miss Distance	horizontal : 12000 vertical : 700
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

During cruise, 11 NM ssw of djb VOR, while level at FL280, we received a TCASII TA for traffic at 1:30 O'clock position and 4.5 NM, 800 ft below our altitude and climbing. We attempted, but were unable to acquire the traffic visually. TCASII then issued a 'climb' RA. We initiated a climb and informed ATC. TCASII then told us to 'monitor vertical speed.' we responded accordingly. When TCASII announced 'clear of conflict,' we notified ATC and returned to our previously assigned altitude.

Original NASA ASRS Text

Title: CL65 CREW RECEIVE A TCASII RA ALERT TO CLB WHILE FLYING AT FL280 UNDER ZAU CTL.

Narrative: DURING CRUISE, 11 NM SSW OF DJB VOR, WHILE LEVEL AT FL280, WE RECEIVED A TCASII TA FOR TFC AT 1:30 O'CLOCK POS AND 4.5 NM, 800 FT BELOW OUR ALT AND CLBING. WE ATTEMPTED, BUT WERE UNABLE TO ACQUIRE THE TFC VISUALLY. TCASII THEN ISSUED A 'CLB' RA. WE INITIATED A CLB AND INFORMED ATC. TCASII THEN TOLD US TO 'MONITOR VERT SPD.' WE RESPONDED ACCORDINGLY. WHEN TCASII ANNOUNCED 'CLR OF CONFLICT,' WE NOTIFIED ATC AND RETURNED TO OUR PREVIOUSLY ASSIGNED ALT.

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.