<< >> NASA ASRS Report 310623, July 1995

Air carrier X TCASII RA climb had near midair collision with VFR air carrier Y TCASII descend. TCASII logic.

Attributes
ACN	310623
Time
Date	199507
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : jfk
State Reference	NY
Altitude	msl bound lower : 10000 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 2 controller radar : 10
ASRS Report	310623
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X, a heavy B747, was being radar vectored to his route. He was issued a climb clearance to 10000 ft. Air carrier Y, an SF34, was on a VFR flight at 10500 ft. X was on a north heading. Y was swbound. Both were on converging headings and issued traffic. X initiated a climb to 10300 ft without advising ATC. Y descended through the altitude of X. Both aircraft were TCASII equipped and after the event advised ATC that they had responded to RA's. I believe that if both aircraft were not equipped with TCASII, this would have been a non occurrence.

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Original NASA ASRS Text

Title: ACR X TCASII RA CLB HAD NMAC WITH VFR ACR Y TCASII DSND. TCASII LOGIC.

Narrative: ACR X, A HVY B747, WAS BEING RADAR VECTORED TO HIS RTE. HE WAS ISSUED A CLB CLRNC TO 10000 FT. ACR Y, AN SF34, WAS ON A VFR FLT AT 10500 FT. X WAS ON A N HDG. Y WAS SWBOUND. BOTH WERE ON CONVERGING HDGS AND ISSUED TFC. X INITIATED A CLB TO 10300 FT WITHOUT ADVISING ATC. Y DSNDED THROUGH THE ALT OF X. BOTH ACFT WERE TCASII EQUIPPED AND AFTER THE EVENT ADVISED ATC THAT THEY HAD RESPONDED TO RA'S. I BELIEVE THAT IF BOTH ACFT WERE NOT EQUIPPED WITH TCASII, THIS WOULD HAVE BEEN A NON OCCURRENCE.

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.