An air carrier MD80 had to take evasive action descend to avoid an A4. Near midair collision.

Attributes
ACN	341129
Time
Date	199607
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : eld
State Reference	AR
Altitude	msl bound lower : 26300 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Skyhawk (A4)
Operating Under FAR Part	other : other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	341129
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	341130
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During cruise at FL270, an intruder popped up on TCASII 800 ft above us and descending. Seconds later the intruder was 700 ft and descending. We received an RA to descend at 1300 FPM or greater. Executed RA to FL263 and received a clear of conflict advisory. Aircraft separation was within 300 ft on TCASII. We notified ATC of deviation and received clearance back to FL270. Intruder was an A4.

Original NASA ASRS Text

Title: AN ACR MD80 HAD TO TAKE EVASIVE ACTION DSND TO AVOID AN A4. NMAC.

Narrative: DURING CRUISE AT FL270, AN INTRUDER POPPED UP ON TCASII 800 FT ABOVE US AND DSNDING. SECONDS LATER THE INTRUDER WAS 700 FT AND DSNDING. WE RECEIVED AN RA TO DSND AT 1300 FPM OR GREATER. EXECUTED RA TO FL263 AND RECEIVED A CLR OF CONFLICT ADVISORY. ACFT SEPARATION WAS WITHIN 300 FT ON TCASII. WE NOTIFIED ATC OF DEV AND RECEIVED CLRNC BACK TO FL270. INTRUDER WAS AN A4.

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.