ACIPS control card—WAI OPAS AIMS ACIPS control card—EAI (left) ACIPS control card—EAI (right) Ice detector (right) WOW ADIRU Ice detector (left) ASCPC ECSMC WES L&R systems ARINC 629 buses Anti-ice/lighting panel (P5) APU bleed air Engine bleed air Engine bleed air 8 1 2 3 4 5 6 7 9 10 11 12 13 14 Heated slats Heated slats WAI valve WAI pressure sensor WAI duct WAI valve WAI pressure sensor WAI duct AUTO OFF ON Electrical connector Locking crank and position indicator Actuator Body Torque motor Locking screw 15-7 Figure 15-10.  A wing anti-ice valve.  Figure 15-9.  Wing leading edge slat anti-ice system. There is one selector for the WAI system. The selector has  three positions: auto, on, and off. With the selector in auto  and no operational mode inhibits, the WAI ACIPS computer  card sends a signal to open the WAI valves when either ice  detector detects ice. The valves close after a 3-minute delay  when the ice detector no longer detects ice. The time delay  prevents frequent on/off cycles during intermittent icing  conditions. With the selector on and no operational mode  inhibits, the WAI valves open. With the selector off, the WAI  valves close. The operational mode for the WAI valves can be  inhibited by many different sets of conditions.  [Figure 15-12] The operational mode is inhibited if all of these conditions  occur: •  Auto mode is selected •  Takeoff mode is selected •  Airplane has been in the air less than 10 minutes