B777 flight crew follows TCASII RA approaching london.

Attributes
ACN	434293
Time
Date	199904
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : logan
State Reference	FO
Altitude	msl bound lower : 23500 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : egtt.artcc
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute airway : ur1.airway
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : egtt.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : relief pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 12200 flight time type : 70
ASRS Report	434293
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 22000 flight time type : 800
ASRS Report	434575
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb other flight crewb
Resolutory Action	controller : issued new clearance controller : issued alert flight crew : returned to intended course
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

At FL240, got TCASII TA 3 O'clock position about 3 mi, same altitude. Visual on aircraft confirmed converging. Got TCASII RA and descend and controller called to make 'left emergency turn to 190 degrees.' did turn and followed RA descend. Both aircraft continued descent, continuing RA descend message. After 500 ft descent, got 'clear of conflict.' climbed back up and continued on course. Crew followed SOP. First officer #2 was PF.

Original NASA ASRS Text

Title: B777 FLC FOLLOWS TCASII RA APCHING LONDON.

Narrative: AT FL240, GOT TCASII TA 3 O'CLOCK POS ABOUT 3 MI, SAME ALT. VISUAL ON ACFT CONFIRMED CONVERGING. GOT TCASII RA AND DSND AND CTLR CALLED TO MAKE 'L EMER TURN TO 190 DEGS.' DID TURN AND FOLLOWED RA DSND. BOTH ACFT CONTINUED DSCNT, CONTINUING RA DSND MESSAGE. AFTER 500 FT DSCNT, GOT 'CLR OF CONFLICT.' CLBED BACK UP AND CONTINUED ON COURSE. CREW FOLLOWED SOP. FO #2 WAS PF.

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.