Less than standard separation over the atlantic.

Attributes
ACN	278292
Time
Date	199407
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pbi
State Reference	FL
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : atlantic enroute airway : g431
Flight Plan	IFR
Aircraft 2
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	cruise other
Route In Use	enroute : atlantic enroute : other oceanic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	278292
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
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 flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

TCASII RA: received TCASII alert and observed 747 converging from 10 O'clock position -- heading westerly -- we were heading south on G431 over jesse intersection. TCASII showed aircraft 800 ft below us. TCASII gave RA and TA. We were off altitude for approximately 1 min. TCASII was quite valuable -- for the aircraft appeared quite close and TCASII altitude information helped in our situational awareness. Ny communication radio was the controling facility and they were advised.

Original NASA ASRS Text

Title: LTSS OVER THE ATLANTIC.

Narrative: TCASII RA: RECEIVED TCASII ALERT AND OBSERVED 747 CONVERGING FROM 10 O'CLOCK POS -- HDG WESTERLY -- WE WERE HEADING S ON G431 OVER JESSE INTXN. TCASII SHOWED ACFT 800 FT BELOW US. TCASII GAVE RA AND TA. WE WERE OFF ALT FOR APPROX 1 MIN. TCASII WAS QUITE VALUABLE -- FOR THE ACFT APPEARED QUITE CLOSE AND TCASII ALT INFO HELPED IN OUR SITUATIONAL AWARENESS. NY COM RADIO WAS THE CTLING FACILITY AND THEY WERE ADVISED.

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.