Air carrier pilot described conflict at 4500 ft during vectors for ILS runway 36L at clt.

Attributes
ACN	725125
Time
Date	200701
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : clt.airport
State Reference	NC
Altitude	msl single value : 4500
Environment
Flight Conditions	IMC
Weather Elements	Rain
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt.tracon
Operator	common carrier : air carrier
Make Model Name	CRJ 900 (all) Canadair Regional Jet 900
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer only : 36l
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : clt.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 3500
ASRS Report	725125
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were southeast of the airport being vectored for the ILS runway 36L. Aircraft #2 was southwest of the airport being vectored for the ILS runway 36R. We got a 300 degree heading and an altitude of 4000 ft. I read back the clearance. We put 4000 ft in the altitude selector and both pilots verified the altitude. This is when we became aware of the other aircraft. It passed below us as we were passing through 5000 ft. We never did get an RA on the airplane but we did get a TA. Approach control then turned us to about 350 degrees to join the localizer and told us to maintain 5000 ft to marjo cleared for ILS runway 36L. I told approach control you cleared us to 4000 ft. We will have to climb back up to 5000 ft. We were established on the localizer and the first officer did not start the climb to 5000 ft until we were at 4100 ft and I told him to do so. Once in the climb; approach control broke us out. Left turn 270 degree heading and vectored us back around for the ILS to runway 36L. Aircraft #2 was established on the ILS for runway 36R; but was concerned about our altitude. Could have been avoided if the aircraft from the west got vectored for the ILS to runway 36L and we got the ILS to runway 36R.

Original NASA ASRS Text

Title: ACR PLT DESCRIBED CONFLICT AT 4500 FT DURING VECTORS FOR ILS RWY 36L AT CLT.

Narrative: WE WERE SE OF THE ARPT BEING VECTORED FOR THE ILS RWY 36L. ACFT #2 WAS SW OF THE ARPT BEING VECTORED FOR THE ILS RWY 36R. WE GOT A 300 DEG HDG AND AN ALT OF 4000 FT. I READ BACK THE CLRNC. WE PUT 4000 FT IN THE ALT SELECTOR AND BOTH PLTS VERIFIED THE ALT. THIS IS WHEN WE BECAME AWARE OF THE OTHER ACFT. IT PASSED BELOW US AS WE WERE PASSING THROUGH 5000 FT. WE NEVER DID GET AN RA ON THE AIRPLANE BUT WE DID GET A TA. APCH CTL THEN TURNED US TO ABOUT 350 DEGS TO JOIN THE LOC AND TOLD US TO MAINTAIN 5000 FT TO MARJO CLRED FOR ILS RWY 36L. I TOLD APCH CTL YOU CLRED US TO 4000 FT. WE WILL HAVE TO CLB BACK UP TO 5000 FT. WE WERE ESTABLISHED ON THE LOC AND THE FO DID NOT START THE CLB TO 5000 FT UNTIL WE WERE AT 4100 FT AND I TOLD HIM TO DO SO. ONCE IN THE CLB; APCH CTL BROKE US OUT. L TURN 270 DEG HDG AND VECTORED US BACK AROUND FOR THE ILS TO RWY 36L. ACFT #2 WAS ESTABLISHED ON THE ILS FOR RWY 36R; BUT WAS CONCERNED ABOUT OUR ALT. COULD HAVE BEEN AVOIDED IF THE ACFT FROM THE W GOT VECTORED FOR THE ILS TO RWY 36L AND WE GOT THE ILS TO RWY 36R.

Data retrieved from NASA's ASRS site as of January 2009 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.