B737 captain, while in level flight on transition to the localizer, approach controller requested him to make an immediate turn and then instructed another aircraft to descend in response to a potential airborne conflict.

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Attributes
ACN	540634
Time
Date	200203
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iah.airport
State Reference	TX
Altitude	msl single value : 6000
Environment
Weather Elements	other
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : i90.tracon
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : instrument non precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : i90.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 14000 flight time type : 4000
ASRS Report	540634
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne less severe non adherence other
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	controller : separated traffic controller : issued new clearance flight crew : took precautionary avoidance action
Miss Distance	horizontal : 6000
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Cleared to descend to 6000 ft altitude, intercept localizer. Level at 6000 ft on localizer, never cleared for the approach. We got a TA and were told to make an immediate turn to heading 180 degrees. As we started the turn, we got an RA with a warning to climb at the same time ATC told the other flight to descend immediately to 5000 ft. As I was about to climb, we got the 'clear of conflict.' this is a controller error. The rest of this does not apply.

Original NASA ASRS Text

Title: B737 CAPT, WHILE IN LEVEL FLT ON TRANSITION TO THE LOC, APCH CTLR REQUESTED HIM TO MAKE AN IMMEDIATE TURN AND THEN INSTRUCTED ANOTHER ACFT TO DSND IN RESPONSE TO A POTENTIAL AIRBORNE CONFLICT.

Narrative: CLRED TO DSND TO 6000 FT ALT, INTERCEPT LOC. LEVEL AT 6000 FT ON LOC, NEVER CLRED FOR THE APCH. WE GOT A TA AND WERE TOLD TO MAKE AN IMMEDIATE TURN TO HDG 180 DEGS. AS WE STARTED THE TURN, WE GOT AN RA WITH A WARNING TO CLB AT THE SAME TIME ATC TOLD THE OTHER FLT TO DSND IMMEDIATELY TO 5000 FT. AS I WAS ABOUT TO CLB, WE GOT THE 'CLR OF CONFLICT.' THIS IS A CTLR ERROR. THE REST OF THIS DOES NOT APPLY.

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.