Air carrier B727 flight crew PIC encounters adverse WX and attempts coordination with ATC, but is unable due to poor communication with HF frequencys. PIC declares emergency, exercises PIC authority/authorized to deviate from WX. PIC notified ZNY and reports back on course after deviation.

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Attributes
ACN	410912
Time
Date	199808
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mia
State Reference	FL
Altitude	msl bound lower : 28000 msl bound upper : 28000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc artcc : zny
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	410912
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	inflight encounter : weather non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Weather

Narrative:

Due to numerous thunderstorms along R763 and area, it was necessary to deviate off route. Due to difficulty of HF communications, was unable to obtain permission in the necessary time. Notified ny oceanic that we were declaring an emergency and exercising captain's emergency authority/authorized to deviate as needed. Kept ny oceanic appraised of our position as best we could. Reported back on course, no conflicts occurred.

Original NASA ASRS Text

Title: ACR B727 FLC PIC ENCOUNTERS ADVERSE WX AND ATTEMPTS COORD WITH ATC, BUT IS UNABLE DUE TO POOR COM WITH HF FREQS. PIC DECLARES EMER, EXERCISES PIC AUTH TO DEVIATE FROM WX. PIC NOTIFIED ZNY AND RPTS BACK ON COURSE AFTER DEV.

Narrative: DUE TO NUMEROUS TSTMS ALONG R763 AND AREA, IT WAS NECESSARY TO DEVIATE OFF RTE. DUE TO DIFFICULTY OF HF COMS, WAS UNABLE TO OBTAIN PERMISSION IN THE NECESSARY TIME. NOTIFIED NY OCEANIC THAT WE WERE DECLARING AN EMER AND EXERCISING CAPT'S EMER AUTH TO DEVIATE AS NEEDED. KEPT NY OCEANIC APPRAISED OF OUR POS AS BEST WE COULD. RPTED BACK ON COURSE, NO CONFLICTS OCCURRED.

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.