TM 1-1520-238-T-7 11–44 11–7. SYSTEM DESCRIPTION (cont) 11–7 (2) System Operation (fig. 11–15). The force trim system must be operating for the DASE system to be fully operational. When the pilot’s cyclic FORCE TRIM REL switch is OFF, power is not applied to the magnetic brakes. The pilot and CPG are in full control of the cyclic sticks and directional pedals. When the pilot’s cyclic FORCE TRIM REL switch is ON, force trim power of 28 VDC is applied through the TRIM circuit breaker (CB87) to the pilot’s cyclic FORCE TRIM REL switch, the CPG’s cyclic TRIM switch, and contacts A2, B2, and C2 of the trim brake relay. Contact A2 mates with A3, B2 mates with B3, and C2 mates with C3, providing 28 VDC to the pitch, roll, and yaw magnetic brakes. The magnetic brakes engage and lock the cyclic sticks and directional pedals in the position selected by the pilot. When the pilot or CPG moves the cyclic stick and directional pedals during force trim operation the feel spring assembly is compressed. The feel spring assembly allows the force trim to be overridden without resetting the force trim. When the cyclic stick and directional pedals are released, the feel trim assemblies return the cyclic sticks and directional pedals to the force trim setting. When the pilot’s cyclic FORCE TRIM REL switch or the CPG’s cyclic TRIM switch RELEASE position is depressed, a ground is supplied to the trim brake relay. The trim brake relay energizes and removes 28 VDC from the magnetic brakes allowing the pilot and CPG to be in full control of the cyclic sticks and directional pedals. When the switch is released, a new force trim reference is established. ASE PANEL 4 AND 5, 7 AND 8, 10 AND 11 FORCE TRIM RELEASE (MOMENTARY) 4 AND 5, 8 AND 9, 10 AND 11 FORCE TRIM ON (NORMAL) 5 AND 6, 8 AND 9, 11 AND 12 FORCE TRIM OFF (PERMANENT) TRIM BRAKE RELAY RTN + 28 VDC + 28 VDC ROLL RTN PITCH RTN + 28 VDC YAW ASE RELEASE SW CPG CYCLIC STICK MONITORING DASEC 5A 28 VDC CB 87 TRIM M70-253 X1 X2 A3 A2 B A K1 - 9 / 10 B3 B2 C3 C2 116 117 7 6 2 1 A1 B1 C1 TRIM RELEASE SW B A B A ASE RELEASE SW PILOT CYCLIC STICK A2 A1 TRIM RELEASE SW A9 11 10 12 A10 A11 A5 7 9 4 6 8 5 (SHOWN IN NORMAL POSITION) Figure 11–15. Force Trim System Functional Block Diagram