MLT FAILS TO RESPOND TO CTR INSTRUCTIONS TO TURN. CTLR TURNS ACR BUT ACFT SLOW TO ALLOW SUCH A STEEP BANK. CLOSE PROX.

1992-08 · NASA ASRS report 217824

Date: 1992-08 · Aircraft: Large Transport; Low Wing; 2 Turbojet Eng

Anomalies: conflict-airborne-conflict|deviation-discrepancy-procedural-clearance|inflight-event-encounter-weather-turbulence|other-unspecified

Synopsis

MLT FAILS TO RESPOND TO CTR INSTRUCTIONS TO TURN. CTLR TURNS ACR BUT ACFT SLOW TO ALLOW SUCH A STEEP BANK. CLOSE PROX.

Narrative

WE WERE WORKING ZID ON 133.05 MEGAHERTZ. THE BUSY CTR CTLR WAS TELLING A MIL (MLT I THINK) LOCATED SOMEWHERE TO OUR 10-11 O'CLOCK POS ALSO AT FL370 TO TAKE AN IMMEDIATE HDG TO THE E (PLUS OR MINUS; I THINK). THE MLT PLANE DID NOT ACKNOWLEDGE. WE COULD NOT SEE HIM ON TCASII AS I THINK HE WAS BEHIND A CELL 20-30 MI AWAY. THE CTLR TRIED SEVERAL TIMES TO CONTACT MLT WITH WHOM HE HAD PREVIOUSLY BEEN IN COM. THE CTLR GAVE US AN IMMEDIATE TURN L TO 360 DEGS. I PUSHED HDG SELECT AND COMMANDED MAX BANK ANGLE ALONG WITH A HDG COMMAND OF 360 DEGS. THE SLUGGISH AUTOPLT DID NOT UNDERSTAND THE URGENT NATURE OF THE TURN; SO I DISCONNECTED WHILE PASSING ABOUT 045 DEGS AND FLEW THE ADI. JUST THEN; MY SUPER COOL CALM AND COLLECTED FO INFORMED ME HE HAD THE BUGGER ON TCASII AHEAD TO THE L (10 TO 1030 O'CLOCK PLUS OR MINUS) AT 10 OR SO MI AND CLOSING FROM THE NE TO THE SW. I WAS IN ABOUT A 30 DEG BANK AT THE TIME; HANGING ON FOR DEAR LIFE AND HOLDING ALT AND MUTTERING. THE CTLR GAVE AN URGENT COMMAND US TO TURN QUICKLY TO A HDG OF 330 DEGS. FO WITH A DIFFERENT TONE TO HIS VOICE COMMANDED ME TO TURN. BY NOW; I WAS IN A 40 DEG BANK PLUS OR MINUS AND FO WAS GIVING ME THE CLOSURE DISTANCE FROM TCASII (WHICH TO SAY THE LEAST IS SLOW AT UPDATING) '9 MI -- 8 MI -- 7 MI.' THEN; AS OUR HDG PASSED 020 DEGS; 12 O'CLOCK; 6 1/2 MI -- PAUSE; 7 MI HE'S MOVING AWAY! AS WE PASSED 350 DEGS THE CTR TOLD US TO TURN R AND PROCEED ON COURSE. HE THEN DEMANDED OF THE MLT WHAT RIGHT HE HAD TO DEVIATE AS HE DID WITHOUT PERMISSION. HE INSTRUCTED THE MLT TO CALL A CERTAIN TELEPHONE NUMBER DUE TO ACTIVATION OF THE CTR PROX WARNING SYS ETC. THERE WAS A SHIFT CHANGE THEN AND THE NEW CTLR GAVE ME THE SUPVR'S PHONE NUMBER WHICH I CALLED. HE TOLD ME ALL THE VOICE AND RADAR TAPES HAD BEEN PULLED FOR INVESTIGATION.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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