<< >> NASA ASRS Report 276103, June 1994

Reporter, observing aircraft 1 and aircraft 2 on converging courses at 5000 ft, instructed both aircraft to turn and descended aircraft 1. Aircraft 1 did not descend. Subsequently, both aircraft received a TCASII alert and took evasive action. Aircraft 1 climbed, aircraft 2 descended. Reporter then assigned altitudes to each aircraft appropriate to TCASII action taken to reestablish separation.

Attributes
ACN	276103
Time
Date	199406
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cdw
State Reference	NJ
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 4
ASRS Report	276103
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	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 other controllera
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 4500 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

I just took control of shaff fv in ewr sector at N90. About 1 min later I saw aircraft 1, a heavy B-767, and aircraft 2 (maybe a DC9) on converging courses at 5000 ft. I told aircraft 1 to turn left heading 090 degrees and descend to 4000 ft expedite descent. I told aircraft 2 expedite right turn to 110 degrees to parallel and eventually diverge courses and get 1000 ft vertical separation. Aircraft 1 was slow in turning and did not start descent at all. About 45 seconds later I saw targets in very close proximity and aircraft 1 at 5500 ft. I asked him if he got a TCASII climb and he said yes. Aircraft 2 said he got a descent and I told him to descend and maintain 4000 ft. When he was level I told aircraft 1 to turn left to 070 degree heading and maintain 5000 ft so he wouldn't descend to 4000 ft. I issued the first turn and descent to aircraft 1 when aircraft were about 5 NM apart. Why he did not start the descent I don't know. There was no traffic below him or above him.

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Original NASA ASRS Text

Title: RPTR, OBSERVING ACFT 1 AND ACFT 2 ON CONVERGING COURSES AT 5000 FT, INSTRUCTED BOTH ACFT TO TURN AND DSNDED ACFT 1. ACFT 1 DID NOT DSND. SUBSEQUENTLY, BOTH ACFT RECEIVED A TCASII ALERT AND TOOK EVASIVE ACTION. ACFT 1 CLBED, ACFT 2 DSNDED. RPTR THEN ASSIGNED ALTS TO EACH ACFT APPROPRIATE TO TCASII ACTION TAKEN TO REESTABLISH SEPARATION.

Narrative: I JUST TOOK CTL OF SHAFF FV IN EWR SECTOR AT N90. ABOUT 1 MIN LATER I SAW ACFT 1, A HVY B-767, AND ACFT 2 (MAYBE A DC9) ON CONVERGING COURSES AT 5000 FT. I TOLD ACFT 1 TO TURN L HDG 090 DEGS AND DSND TO 4000 FT EXPEDITE DSCNT. I TOLD ACFT 2 EXPEDITE R TURN TO 110 DEGS TO PARALLEL AND EVENTUALLY DIVERGE COURSES AND GET 1000 FT VERT SEPARATION. ACFT 1 WAS SLOW IN TURNING AND DID NOT START DSCNT AT ALL. ABOUT 45 SECONDS LATER I SAW TARGETS IN VERY CLOSE PROX AND ACFT 1 AT 5500 FT. I ASKED HIM IF HE GOT A TCASII CLB AND HE SAID YES. ACFT 2 SAID HE GOT A DSCNT AND I TOLD HIM TO DSND AND MAINTAIN 4000 FT. WHEN HE WAS LEVEL I TOLD ACFT 1 TO TURN L TO 070 DEG HDG AND MAINTAIN 5000 FT SO HE WOULDN'T DSND TO 4000 FT. I ISSUED THE FIRST TURN AND DSCNT TO ACFT 1 WHEN ACFT WERE ABOUT 5 NM APART. WHY HE DID NOT START THE DSCNT I DON'T KNOW. THERE WAS NO TFC BELOW HIM OR ABOVE HIM.

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.