Large transport has less than standard separation on oceanic flight. TCASII RA.

Attributes
ACN	291865
Time
Date	199412
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : g339
State Reference	FO
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : pacific enroute : other oceanic enroute airway : rorg
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Military
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : pacific
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8500 flight time type : 2500
ASRS Report	291865
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew Other
Miss Distance	horizontal : 9000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Initial altitude assignment FL300. Restr issued by naha control FL290. Clearance issued by naha control at XA32Z on VHF. 'Climb to maintain FL310 until reaching 134 east, then climb to maintain FL330.' clearance issued via naha radio (HF 8903) at XA47Z: 'descend immediately to maintain FL290.' traffic conflict occurred at XA47Z approaching bixak intersection at FL310. TCASII alerted us with a 'TA' followed by an immediate 'RA.' traffic was sighted and evasive action taken. As the TCASII was activating we were selcaled on HF 8903 by naha radio and told to 'descend immediately' to FL290. Suspect an error or lack of coordination between naha radio, naha control, and other aircraft. Naha radio later idented the other aircraft as a 'mlt B' or 'XXXB.' the aircraft appeared to be a military transport type.

Original NASA ASRS Text

Title: LGT HAS LTSS ON OCEANIC FLT. TCASII RA.

Narrative: INITIAL ALT ASSIGNMENT FL300. RESTR ISSUED BY NAHA CTL FL290. CLRNC ISSUED BY NAHA CTL AT XA32Z ON VHF. 'CLB TO MAINTAIN FL310 UNTIL REACHING 134 E, THEN CLB TO MAINTAIN FL330.' CLRNC ISSUED VIA NAHA RADIO (HF 8903) AT XA47Z: 'DSND IMMEDIATELY TO MAINTAIN FL290.' TFC CONFLICT OCCURRED AT XA47Z APCHING BIXAK INTXN AT FL310. TCASII ALERTED US WITH A 'TA' FOLLOWED BY AN IMMEDIATE 'RA.' TFC WAS SIGHTED AND EVASIVE ACTION TAKEN. AS THE TCASII WAS ACTIVATING WE WERE SELCALED ON HF 8903 BY NAHA RADIO AND TOLD TO 'DSND IMMEDIATELY' TO FL290. SUSPECT AN ERROR OR LACK OF COORD BTWN NAHA RADIO, NAHA CTL, AND OTHER ACFT. NAHA RADIO LATER IDENTED THE OTHER ACFT AS A 'MLT B' OR 'XXXB.' THE ACFT APPEARED TO BE A MIL TRANSPORT TYPE.

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.