<< >> NASA ASRS Report 324274, December 1995

ARTCC radar controller issued turn to a B767 for traffic, got no response and tried 2 more times to turn aircraft. The conflicting traffic, an A340, heard the controller give the TA turn and did turn. Subsequently the B767 got a TCASII RA and followed it, and then told ATC he had never heard the turns given to him. Another air carrier on the frequency heard all the controller's xmissions.

Attributes
ACN	324274
Time
Date	199512
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : pse
State Reference	PR
Altitude	msl bound lower : 39000 msl bound upper : 39400
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : mjzs tower : phl
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	324274
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At about XA35 a B767 flight at FL390 was issued a turn for traffic, no reply. Another turn immediately, no reply. Last traffic alert turn, no reply. A340 flight was turned, no reply. However, this flight did take the TA turn. The B767 then says he is taking the TCASII alert evasive climb to FL394, however never turned. B767 added he never received any turns, while another flight (air carrier) volunteered that he had copied all the xmissions.

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Original NASA ASRS Text

Title: ARTCC RADAR CTLR ISSUED TURN TO A B767 FOR TFC, GOT NO RESPONSE AND TRIED 2 MORE TIMES TO TURN ACFT. THE CONFLICTING TFC, AN A340, HEARD THE CTLR GIVE THE TA TURN AND DID TURN. SUBSEQUENTLY THE B767 GOT A TCASII RA AND FOLLOWED IT, AND THEN TOLD ATC HE HAD NEVER HEARD THE TURNS GIVEN TO HIM. ANOTHER ACR ON THE FREQ HEARD ALL THE CTLR'S XMISSIONS.

Narrative: AT ABOUT XA35 A B767 FLT AT FL390 WAS ISSUED A TURN FOR TFC, NO REPLY. ANOTHER TURN IMMEDIATELY, NO REPLY. LAST TFC ALERT TURN, NO REPLY. A340 FLT WAS TURNED, NO REPLY. HOWEVER, THIS FLT DID TAKE THE TA TURN. THE B767 THEN SAYS HE IS TAKING THE TCASII ALERT EVASIVE CLB TO FL394, HOWEVER NEVER TURNED. B767 ADDED HE NEVER RECEIVED ANY TURNS, WHILE ANOTHER FLT (ACR) VOLUNTEERED THAT HE HAD COPIED ALL THE XMISSIONS.

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.