AN MD80 ON ROTATION TO 1000 FT DECLARED AN EMER AND DIVERTED DUE TO LOSS OF ENVIRONMENTAL DATA ON THE CAPT'S INSTS.

Narrative

DURING ROTATION RWY 25L AUS; LOST AUTOTHROTTLES; FLT DIRECTOR; AND CAPT AIRSPD BEGAN TO DECREASE. GPWAS BEGAN ALERT 'TERRAIN; TERRAIN' AND 'WHOOP; WHOOP; PULL UP.' ATTEMPTED TO STAY VFR BUT UNABLE. FLEW VECTORED ILS TO RWY 35L. ON LNDG; UNABLE TO START APU. DURING PATTERN; MAY HAVE DEVIATED FROM ASSIGNED HDGS OR ALTS. AUS TWR CTLR OUTSTANDING AND VERY HELPFUL. CAPT MADE EXCELLENT USE OF ALL RESOURCES INCLUDING FO; ATC; FLT ATTENDANTS AND COMPANY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT AT ROTATION THE AUTOTHROTTLES DISCONNECTED; CAPT'S FLT DIRECTOR DISCONNECTED AND CAPT'S AIRSPD STARTED TO DECREASE. THE RPTR SAID HE LOOKED ACROSS AT THE CAPT'S INSTS AND DETERMINED THE FAILURE WAS ONLY ON THE CAPT'S SIDE. THE RPTR STATED THE AIRPLANE OVERNIGHTED IN AUS DURING A SEVERE ICE STORM AND AS A RESULT WAS DEICED PRIOR TO DEP. THE RPTR STATED MAINT REPLACED THE #1 CENTRAL AIR DATA COMPUTER AND TESTED OK. THE RPTR AND CAPT BELIEVE THE PROB WAS MAINLY CAUSED BY DEICING FLUID IN THE PITOT AND STATIC TUBES AND PLUMBING OF #1 SYS.