Air carrier receives TCASII alert as fgt climbs at rapid rate.

Attributes
ACN	175423
Time
Date	199104
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 28500 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl artcc : czqx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Fighter
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 6000 flight time type : 2500
ASRS Report	175423
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While cruising FL290 southbound we received traffic information from atl controller, '12 O'clock, 10 mi, climbing FL280.' moments later our traffic collision avoidance system (TCAS) commanded a climb maneuver to avoiding oncoming traffic. We spotted the traffic immediately (an fgt) and verified with center. The reason for the commanded climb was evidently resulting from the fgt climb rate. As it approached us, its altitude readout on TCAS continued to decrease to approximately 500' under as it passed. We questioned with atl its altitude and they stated, 'FL280.' to us, a poor level off by the military pilot resulting in an overshoot of their altitude. Guess one ought to watch those climb rates in the last 1000'.

Original NASA ASRS Text

Title: ACR RECEIVES TCASII ALERT AS FGT CLIMBS AT RAPID RATE.

Narrative: WHILE CRUISING FL290 SBND WE RECEIVED TFC INFO FROM ATL CTLR, '12 O'CLOCK, 10 MI, CLBING FL280.' MOMENTS LATER OUR TFC COLLISION AVOIDANCE SYS (TCAS) COMMANDED A CLB MANEUVER TO AVOIDING ONCOMING TFC. WE SPOTTED THE TFC IMMEDIATELY (AN FGT) AND VERIFIED WITH CENTER. THE REASON FOR THE COMMANDED CLB WAS EVIDENTLY RESULTING FROM THE FGT CLB RATE. AS IT APCHED US, ITS ALT READOUT ON TCAS CONTINUED TO DECREASE TO APPROX 500' UNDER AS IT PASSED. WE QUESTIONED WITH ATL ITS ALT AND THEY STATED, 'FL280.' TO US, A POOR LEVEL OFF BY THE MIL PLT RESULTING IN AN OVERSHOOT OF THEIR ALT. GUESS ONE OUGHT TO WATCH THOSE CLB RATES IN THE LAST 1000'.

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.