E-135. CAPT'S SEAT SLID BACK ON TKOF ROLL; TO THE POINT THAT THE FO HAD TO ASSUME CTL OF THE ACFT.

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ABORTED TKOF DUE TO CAPT'S SEAT (PF) SLIDING BACK FAR ENOUGH TO BE UNABLE TO CTL THE ACFT. FO TOOK CTL AT DIRECTION OF CAPT. THIS HAPPENED AT APPROX 80 KTS. THE SEAT SLID BACK 4-5 SEAT SLOTS. WE PERFORMED THE REQUIRED CHKLISTS AND FOUND THAT CHKLIST STATES ...CAPT WILL ASSUME CTL OF THE ACFT... THIS IS NOT ALWAYS POSSIBLE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CREW WAS FLYING AN EMBRAER 135 ACFT. CAPT INDICATED HE IS ONLY 5 FT 6 INCHES IN HT. HE ADJUSTS HIS SEAT FULL FWD. HE HAD A VERY SHARP FO WHO ASSUMED CTL OF THE ACFT DURING THE ABORTED TKOF. THE FO HAD JUST CALLED 80 KTS. CAPT STATES THE SEAT RAILS HAVE HOLES THAT AN ADJUSTMENT PIN LOCKS INTO; SIMILAR TO THOSE ON CESSNA ACFT. THE CAPT SAID HE HAS HAD THIS HAPPEN BEFORE; BUT THE SEAT HAS ONLY SLID BACK ONE NOTCH ADJUSTMENT BEFORE LOCKING. THIS TIME IT SLID FULL BACK. AFTER THE ABORT; THE CREW TAXIED BACK TO THE GATE. THE CREW LISTED THE SEAT PROB IN THE ACFT MAINT LOG. THE COMPANY REPLACED THE SEAT RAILS WITH THE NEW 'BROWN COLORED' RAILS. THE CAPT WOULD LIKE TO SEE ALL ACFT MODIFIED WITH THE NEW RAILS AS SOON AS POSSIBLE. THE CAPT HAS FLOWN CESSNA ACFT AND WAS AWARE OF THEIR PROB. HE SAID THE ONLY THING HE COULD THINK OF WHEN THE SEAT WAS SLIDING BACK; WAS DON'T PULL ON THE CTL WHEEL; OVER AND OVER AGAIN. THE CAPT STATES THE OLDEST ACFT IN THE ACR FLEET WAS DELIVERED IN 1997.