B777 crew was required to exercise emergency authority/authorized to avoid convective WX.

Attributes
ACN	443732
Time
Date	199906
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : adnip
State Reference	FO
Altitude	msl single value : 31000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : rjtg.artcc
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute airway : r591.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	443732
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	inflight encounter : weather non adherence : clearance other spatial deviation
Resolutory Action	flight crew : declared emergency other
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Weather
Primary Problem	Weather

Narrative:

Needed WX deviation approaching adnip on R591. Requested deviation from tokyo radio several times and told to stand by. Told tokyo radio that I was using my emergency authority/authorized to deviation 25 mi left of course. Tokyo cleared me as requested right afterwards. Same scenario 2 more times. WX appeared to be centered only on R591.

Original NASA ASRS Text

Title: B777 CREW WAS REQUIRED TO EXERCISE EMER AUTH TO AVOID CONVECTIVE WX.

Narrative: NEEDED WX DEV APCHING ADNIP ON R591. REQUESTED DEV FROM TOKYO RADIO SEVERAL TIMES AND TOLD TO STAND BY. TOLD TOKYO RADIO THAT I WAS USING MY EMER AUTH TO DEV 25 MI L OF COURSE. TOKYO CLRED ME AS REQUESTED RIGHT AFTERWARDS. SAME SCENARIO 2 MORE TIMES. WX APPEARED TO BE CTRED ONLY ON R591.

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.