B767-300 CREW HAD THE CAPT'S HSI GO BLANK; WITH SMOKE AND FUMES IN THE COCKPIT.

Narrative

CAPT'S HSI WENT BLANK FOLLOWED BY A WISP OF SMOKE FROM UNDER THE GLARE SHIELD AND AN ACRID SMELL. WE DONNED OXYGEN MASKS AND ESTABLISHED COM. I DECLARED AN EMER AND WITH AN IMMEDIATE CLRNC FROM CTR WE BEGAN A TURN TOWARD ZZZ. OUR DISTANCE FROM ZZZ WAS APPROX 100 MI AND AT FL320 WE FOUND OURSELVES ON A NEAR OPTIMUM DSCNT TO ZZZ. SMOKE WAS VISIBLE FOR NO MORE THAN 10 SECONDS AND THEN DISSIPATED. WITH THE SOURCE OF SMOKE KNOWN AND THE SMOKE DISSIPATED; I ELECTED TO CONTINUE TO ZZZ AT BEST POSSIBLE SPD TO LAND ON RWY 25R. THE WX WAS VFR AND THE WIND WAS 240 DEGS AT 9 KTS. WE TOUCHED DOWN AT A WT OF 336000 LBS AND ROLLED TO THE END TO NEGATE POSSIBLE HOT BRAKES. THE EMER TRUCKS WERE THERE AT MY REQUEST TO OBSERVE OUR WHEELS AND BRAKES WHEREUPON WE TAXIED TO THE GATE. ATC HANDLING WAS EXPEDITIOUS AND EXCELLENT. SUPPLEMENTAL INFO FROM ACN 628011: ON CLBOUT; THE CAPT'S HSI WENT BLANK. I WAS THE PF; AND HE ASKED ME TO FLY THE RETURN AT MAX SPD AND TALK WITH ATC ON THE RADIO WHILE HE WORKED ON OTHER DUTIES. WHILE FLYING THE DSCNT; I GOT THE ACFT SET UP FOR THE APCH AND OVERWT LNDG AT ZZZ. WHEN CLOSER TO ZZZ HE BRIEFED THE APCH TO RWY 25R (WIND 240 DEGS AT 9 KTS) AND TOOK THE CTLS ON DOWNWIND FOR AN UNEVENTFUL APCH AND LNDG. FIRE TRUCKS MET US AT THE END TO CHK THE BRAKES; AND WE TAXIED TO THE GATE. FROM A HUMAN FACTORS STANDPOINT; I FELT THE OXYGEN MASK WAS VERY TIGHT ON MY FACE; AND IT WAS TIME CONSUMING TO KEEP PUSHING THE INTERPHONE BUTTON AND THE VHF BUTTON FOR COM. ATC FOUND IT DIFFICULT TO UNDERSTAND MY VOICE THROUGH THE MASK MIC SOMETIMES. I WAS PRESSED FOR TIME FLYING; COMMUNICATING; AND GETTING THE FMC; ETC; SET UP FOR ZZZ; BUT I WAS ABLE TO DO IT.