B757 initiates WX avoidance deviation without prior ATC approval; following existing procedures.

Attributes
ACN	701382
Time
Date	200606
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zny.artcc
State Reference	NY
Altitude	msl single value : 35000
Environment
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	701382
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	701383
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Weather Flight Crew Human Performance ATC Human Performance
Primary Problem	Weather

Narrative:

Approaching simba intersection; I requested the first officer to ask comrdo for 30 NM deviation to the west of course. Comrdo replied with unable; then we followed the waters airspace procedures to deviation around a line of thunderstorms that were well above us. We descended to FL347 and announced our intentions and position on 121.5. We also advised comrdo on 113.30 HF that we were deviating in accordance with a 'deviation required.' I advised comrdo that we were back on course and were able to meet the crossing restr at kraft. Then comrdo SELCAL'ed us and we were told to call ZNY as soon as possible after landing. I did call them and the supervisor told me that he was required to file a report.

Original NASA ASRS Text

Title: B757 INITIATES WX AVOIDANCE DEV WITHOUT PRIOR ATC APPROVAL; FOLLOWING EXISTING PROCS.

Narrative: APCHING SIMBA INTXN; I REQUESTED THE FO TO ASK COMRDO FOR 30 NM DEV TO THE W OF COURSE. COMRDO REPLIED WITH UNABLE; THEN WE FOLLOWED THE WATERS AIRSPACE PROCS TO DEV AROUND A LINE OF TSTMS THAT WERE WELL ABOVE US. WE DSNDED TO FL347 AND ANNOUNCED OUR INTENTIONS AND POS ON 121.5. WE ALSO ADVISED COMRDO ON 113.30 HF THAT WE WERE DEVIATING IN ACCORDANCE WITH A 'DEV REQUIRED.' I ADVISED COMRDO THAT WE WERE BACK ON COURSE AND WERE ABLE TO MEET THE XING RESTR AT KRAFT. THEN COMRDO SELCAL'ED US AND WE WERE TOLD TO CALL ZNY ASAP AFTER LNDG. I DID CALL THEM AND THE SUPVR TOLD ME THAT HE WAS REQUIRED TO FILE A RPT.

Data retrieved from NASA's ASRS site as of January 2009 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.