Flight crew of a B767 must deviate from course to avoid thunderstorms and enter military airspace. ATC requests turn back to original course. Captain invokes emergency authority/authorized.

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Attributes
ACN	411261
Time
Date	199808
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sxm
State Reference	FO
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : sxm
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	411261
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter : weather other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Weather

Narrative:

ATC facility: sju center. Location: 70 NM north sxm. While descending into sxm, deviated right of track because of severe thunderstorms. Sju ATC advised me that I needed to make a turn back to the left to avoid military airspace. I was unable to turn left because of thunderstorms, so exercised my emergency authority/authorized and declared an emergency. Was able to turn back to the left after approximately 12 mi.

Original NASA ASRS Text

Title: FLC OF A B767 MUST DEVIATE FROM COURSE TO AVOID TSTMS AND ENTER MIL AIRSPACE. ATC REQUESTS TURN BACK TO ORIGINAL COURSE. CAPT INVOKES EMER AUTH.

Narrative: ATC FACILITY: SJU CTR. LOCATION: 70 NM N SXM. WHILE DSNDING INTO SXM, DEVIATED R OF TRACK BECAUSE OF SEVERE TSTMS. SJU ATC ADVISED ME THAT I NEEDED TO MAKE A TURN BACK TO THE L TO AVOID MIL AIRSPACE. I WAS UNABLE TO TURN L BECAUSE OF TSTMS, SO EXERCISED MY EMER AUTH AND DECLARED AN EMER. WAS ABLE TO TURN BACK TO THE L AFTER APPROX 12 MI.

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.