<< >> NASA ASRS Report 158154, September 1990

Radar altitude separation was lost between an aircraft being vectored to runway 27 and another aircraft being controled by another controller.

Attributes
ACN	158154
Time
Date	199009
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mem
State Reference	TN
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mem
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2550
ASRS Report	158154
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	vertical : 499
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure

Narrative:

We were told to expect runway 27 at mem. Flying a heading of about 180 at 4000' MSL we were told to turn left to 090 degree and descend to 2000' MSL and expedite through 3000' MSL. Next we received a report from the controller of traffic at 10 O'clock. We looked and didn't see the traffic. Before we had completed our turn to 90 degree the controller came back on and told us to turn right to 270 degree. As soon as we started our turn back to west the mdt flew over us westbound in a climbing turn. Apparently the mdt was on a different frequency. Upon talking to the mdt crew on the ground it sounded like they received almost identical instructions prior to the occurrence. They were on a different frequency talking to a different controller.

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Original NASA ASRS Text

Title: RADAR ALT SEPARATION WAS LOST BETWEEN AN ACFT BEING VECTORED TO RWY 27 AND ANOTHER ACFT BEING CTLED BY ANOTHER CTLR.

Narrative: WE WERE TOLD TO EXPECT RWY 27 AT MEM. FLYING A HDG OF ABOUT 180 AT 4000' MSL WE WERE TOLD TO TURN L TO 090 DEG AND DSND TO 2000' MSL AND EXPEDITE THROUGH 3000' MSL. NEXT WE RECEIVED A RPT FROM THE CTLR OF TFC AT 10 O'CLOCK. WE LOOKED AND DIDN'T SEE THE TFC. BEFORE WE HAD COMPLETED OUR TURN TO 90 DEG THE CTLR CAME BACK ON AND TOLD US TO TURN R TO 270 DEG. AS SOON AS WE STARTED OUR TURN BACK TO W THE MDT FLEW OVER US WBND IN A CLBING TURN. APPARENTLY THE MDT WAS ON A DIFFERENT FREQ. UPON TALKING TO THE MDT CREW ON THE GND IT SOUNDED LIKE THEY RECEIVED ALMOST IDENTICAL INSTRUCTIONS PRIOR TO THE OCCURRENCE. THEY WERE ON A DIFFERENT FREQ TALKING TO A DIFFERENT CTLR.

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.