Narrative:

Controller wanted me to descend into an area of active thunderstorms. He insisted that we do this. For safety reasons I refused this foolish request and stated so. He refused to acknowledge that transmission, saying our radio was unreadable. However, we experienced no onboard problems with our communication devices before or after. He refused our initial request to remain at altitude and descend or to be vectored off course to avoid traffic and the WX. I had no choice but to use my emergency authority/authorized to keep safe. This action was confrontational and very dangerous, as the controller did not know our exact flight conditions. Subsequent sectors complied with our request and we made an uneventful landing at sus at approximately XA25Z.

Related reports:

Google
 

Original NASA ASRS Text

Title: REGIONAL JET CL601 FORCED TO USE EMER AUTH TO REMAIN CLR OF TSTM WHEN ATC CTLR DIRECTS SUCH A DSCNT.

Narrative: CTLR WANTED ME TO DSND INTO AN AREA OF ACTIVE TSTMS. HE INSISTED THAT WE DO THIS. FOR SAFETY REASONS I REFUSED THIS FOOLISH REQUEST AND STATED SO. HE REFUSED TO ACKNOWLEDGE THAT XMISSION, SAYING OUR RADIO WAS UNREADABLE. HOWEVER, WE EXPERIENCED NO ONBOARD PROBS WITH OUR COM DEVICES BEFORE OR AFTER. HE REFUSED OUR INITIAL REQUEST TO REMAIN AT ALT AND DSND OR TO BE VECTORED OFF COURSE TO AVOID TFC AND THE WX. I HAD NO CHOICE BUT TO USE MY EMER AUTH TO KEEP SAFE. THIS ACTION WAS CONFRONTATIONAL AND VERY DANGEROUS, AS THE CTLR DID NOT KNOW OUR EXACT FLT CONDITIONS. SUBSEQUENT SECTORS COMPLIED WITH OUR REQUEST AND WE MADE AN UNEVENTFUL LNDG AT SUS AT APPROX XA25Z.

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.