CHK PLT WAS CONDUCTING CAPT PROFICIENCY CHK ON ANOTHER COMPANY PLT (PIC) UNDER DARK NGT CONDTNS. SUBSEQUENT TO FULL STOP LDG ON RWY 25, TAKEOFF CHKLST WAS RECITED. PIC COMMENCED T/O ON RWY 07. CHK PLT SIMULATED VI ENG CUT AFTER LIFTOFF. PIC WAS UNABLE TO ACCEL TO V2, CLIMB, OR MAINTAIN DIRECTNL CONTRL. ACFT LEVELLED OFF, A/S BEGAN TO DECAY & ACFT DRIFTED TO THE RIGHT. CHK CAPT FAILED TO TAKE CNTRL OR TERMINATE ENG CUT SIMULATION AS EVOLUTION DETERIORATED. ACFT COLLIDED WITH ILS GS TWR MARKED BY RED OBST LIGHTS. LOSS OF CNTRL FOLLOWED WHEN RGT WINGTIP/AILERON SEPARATED. ACFT THEN IMPACTED GND AND SLID TO A STOP. TKOF FLAP POSITION SHOULD BE 1/4. BOTH FLAPS FOUND NEAR 1/2 FLAP EXTENDED POSITION. HANDLE FOUND IN 1/2 FLAP DETENT. PERFMNC CHARTS SHOW ACFT ABL TO REACH V2 AT 50 FT ALT IN 6500 FT ROLL, THEN +575 FPM CLIMB (VYSE) AT ACC WT.