<< >> NASA ASRS Report 250677, September 1993

Air carrier large transport performs altitude deviation altitude excursion in evasive action climb in flight crew response to TCASII RA.

Attributes
ACN	250677
Time
Date	199309
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : otk
State Reference	GA
Altitude	msl bound lower : 27000 msl bound upper : 27700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
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 : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 2400
ASRS Report	250677
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 13000 flight time type : 1000
ASRS Report	250907
Events
Anomaly	altitude deviation : overshoot altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

In cruise at FL270 got a TCASII TA. Noted traffic on TCASII display at 12 O'clock climbing through 26100 ft. Immediately began getting a TCASII RA to 'climb, climb' etc. We, captain flying, began an immediate climb as directed by TCASII. We announced to ATC what we were doing. They had not issued any TA's at this point. We eventually 'topped out' at 27700 ft and sighted traffic as he (military fgt) passed beneath (at 26700 ft according to TCASII) and slightly to our right. We immediately descended back to FL270. This is the first 'real' TCASII I've had in almost 4 yrs on the large transport/widebody transport equipment. In all previous TCASII sits we have had enough warning or an early visual and did not have to follow the TCASII RA. For me, this was the one incident that makes TCASII 'worth' everything that has been put into it. It was critical to a safe resolution of this situation.

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• Air carrier large transport PIC performs evasive action desc...

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Original NASA ASRS Text

Title: ACR LGT PERFORMS ALTDEV ALT EXCURSION IN EVASIVE ACTION CLB IN FLC RESPONSE TO TCASII RA.

Narrative: IN CRUISE AT FL270 GOT A TCASII TA. NOTED TFC ON TCASII DISPLAY AT 12 O'CLOCK CLBING THROUGH 26100 FT. IMMEDIATELY BEGAN GETTING A TCASII RA TO 'CLB, CLB' ETC. WE, CAPT FLYING, BEGAN AN IMMEDIATE CLB AS DIRECTED BY TCASII. WE ANNOUNCED TO ATC WHAT WE WERE DOING. THEY HAD NOT ISSUED ANY TA'S AT THIS POINT. WE EVENTUALLY 'TOPPED OUT' AT 27700 FT AND SIGHTED TFC AS HE (MIL FGT) PASSED BENEATH (AT 26700 FT ACCORDING TO TCASII) AND SLIGHTLY TO OUR R. WE IMMEDIATELY DSNDED BACK TO FL270. THIS IS THE FIRST 'REAL' TCASII I'VE HAD IN ALMOST 4 YRS ON THE LGT/WDB EQUIP. IN ALL PREVIOUS TCASII SITS WE HAVE HAD ENOUGH WARNING OR AN EARLY VISUAL AND DID NOT HAVE TO FOLLOW THE TCASII RA. FOR ME, THIS WAS THE ONE INCIDENT THAT MAKES TCASII 'WORTH' EVERYTHING THAT HAS BEEN PUT INTO IT. IT WAS CRITICAL TO A SAFE RESOLUTION OF THIS SIT.

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.