<< >> NASA ASRS Report 584218, June 2003

A B757-200 flight crew respond to TCASII RA due to opposite direction H25B at FL390 on A300 in ZNY airspace, coordination event with new york comrdo.

Attributes
ACN	584218
Time
Date	200306
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : holma
State Reference	FO
Altitude	msl bound lower : 38500 msl bound upper : 39000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc tower : sdf.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zny.artcc
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	584218
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	584219
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : required legal separation non adherence : published procedure
Independent Detector	aircraft equipment : tcas
Resolutory Action	controller : issued new clearance flight crew : took evasive action flight crew : returned to assigned altitude
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Problem Areas	Weather ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

During cruise at FL390 at holma intersection on A300, bdl to sju, at XA46Z, descended from FL390 to FL385 due to RA. Other aircraft was also at FL390 opposite direction. Notified other traffic on 123.45, then notified commercial radio on HF 13297 that we wre descending due to an RA. On commercial radio frequency, heard aircraft informing that they had climbed due to an RA. When trying to inform commercial radio, the frequency was getting jammed by another aircraft transmitting -- no voice. After several attempts, we finally got through. After conflict was resolved, commercial radio told us to maintain FL390 and told other aircraft to maintain FL410 and commercial radio notified ATC. We never acquired visually due to IMC, however, estimate a couple of mi separation. When assigned FL390 from ZBW, we were told of chop up through FL370, but smooth at FL390. This makes us believe we were at the correct altitude, plus the fact that both pilots verified the altitude when placed into the altitude window.

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Original NASA ASRS Text

Title: A B757-200 FLT CREW RESPOND TO TCASII RA DUE TO OPPOSITE DIRECTION H25B AT FL390 ON A300 IN ZNY AIRSPACE, COORD EVENT WITH NEW YORK COMRDO.

Narrative: DURING CRUISE AT FL390 AT HOLMA INTXN ON A300, BDL TO SJU, AT XA46Z, DSNDED FROM FL390 TO FL385 DUE TO RA. OTHER ACFT WAS ALSO AT FL390 OPPOSITE DIRECTION. NOTIFIED OTHER TFC ON 123.45, THEN NOTIFIED COMMERCIAL RADIO ON HF 13297 THAT WE WRE DSNDING DUE TO AN RA. ON COMMERCIAL RADIO FREQ, HEARD ACFT INFORMING THAT THEY HAD CLBED DUE TO AN RA. WHEN TRYING TO INFORM COMMERCIAL RADIO, THE FREQ WAS GETTING JAMMED BY ANOTHER ACFT XMITTING -- NO VOICE. AFTER SEVERAL ATTEMPTS, WE FINALLY GOT THROUGH. AFTER CONFLICT WAS RESOLVED, COMMERCIAL RADIO TOLD US TO MAINTAIN FL390 AND TOLD OTHER ACFT TO MAINTAIN FL410 AND COMMERCIAL RADIO NOTIFIED ATC. WE NEVER ACQUIRED VISUALLY DUE TO IMC, HOWEVER, ESTIMATE A COUPLE OF MI SEPARATION. WHEN ASSIGNED FL390 FROM ZBW, WE WERE TOLD OF CHOP UP THROUGH FL370, BUT SMOOTH AT FL390. THIS MAKES US BELIEVE WE WERE AT THE CORRECT ALT, PLUS THE FACT THAT BOTH PLTS VERIFIED THE ALT WHEN PLACED INTO THE ALT WINDOW.

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.