SF34 crew and learjet had less than legal separation in ZTL class a.

Attributes
ACN	526451
Time
Date	200109
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mgm.airport
State Reference	AL
Altitude	msl single value : 21000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2400 flight time type : 700
ASRS Report	526451
Person 2
Affiliation	company : air carrier
Function	oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : far other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action none taken : detected after the fact other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 18000 vertical : 499
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were in cruise flight at FL210 when we got a TA on the TCASII. We looked for the traffic and did not get visual contact when the TCASII gave us an RA to climb. We disconnected the autoplt, and immediately climbed to FL215. I notified ZTL and controller apologized and said it got busy and forgot to alert us of the traffic (a learjet) passing off our left.

Original NASA ASRS Text

Title: SF34 CREW AND LEARJET HAD LESS THAN LEGAL SEPARATION IN ZTL CLASS A.

Narrative: WE WERE IN CRUISE FLT AT FL210 WHEN WE GOT A TA ON THE TCASII. WE LOOKED FOR THE TFC AND DID NOT GET VISUAL CONTACT WHEN THE TCASII GAVE US AN RA TO CLB. WE DISCONNECTED THE AUTOPLT, AND IMMEDIATELY CLBED TO FL215. I NOTIFIED ZTL AND CTLR APOLOGIZED AND SAID IT GOT BUSY AND FORGOT TO ALERT US OF THE TFC (A LEARJET) PASSING OFF OUR L.

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.