TCASII RA. Altitude deviation altitude excursion.

Attributes
ACN	299959
Time
Date	199503
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 3500 msl bound upper : 5000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
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 : 150 flight time total : 18000
ASRS Report	299959
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 600
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

We were heading approximately 060 degrees cleared to intercept runway 9L localizer cleared for the approach behind another aircraft. The traffic in front of us was pointed out as was the traffic at our 11 O'clock, high. We had visual contact with the 2 airliners and at the same time I caught sight of a TCASII target showing yellow minus 600 ft on my vsi. Almost immediately TCASII gave an RA with the words climb! Climb! Climb! Sounding. This continued as I climbed to 5000 ft. While climbing, tower turned us to a 140 degree heading. We never saw the traffic causing the conflict and tower said they saw nothing. We were turned back in and cleared to land which we did with no further problem. Visibility was good, but there was a scattered cloud layer at approximately 4500-5000 ft.

Original NASA ASRS Text

Title: TCASII RA. ALTDEV ALT EXCURSION.

Narrative: WE WERE HDG APPROX 060 DEGS CLRED TO INTERCEPT RWY 9L LOC CLRED FOR THE APCH BEHIND ANOTHER ACFT. THE TFC IN FRONT OF US WAS POINTED OUT AS WAS THE TFC AT OUR 11 O'CLOCK, HIGH. WE HAD VISUAL CONTACT WITH THE 2 AIRLINERS AND AT THE SAME TIME I CAUGHT SIGHT OF A TCASII TARGET SHOWING YELLOW MINUS 600 FT ON MY VSI. ALMOST IMMEDIATELY TCASII GAVE AN RA WITH THE WORDS CLB! CLB! CLB! SOUNDING. THIS CONTINUED AS I CLBED TO 5000 FT. WHILE CLBING, TWR TURNED US TO A 140 DEG HDG. WE NEVER SAW THE TFC CAUSING THE CONFLICT AND TWR SAID THEY SAW NOTHING. WE WERE TURNED BACK IN AND CLRED TO LAND WHICH WE DID WITH NO FURTHER PROB. VISIBILITY WAS GOOD, BUT THERE WAS A SCATTERED CLOUD LAYER AT APPROX 4500-5000 FT.

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.