AIRFRAME MODE SELECT SELECTOR (four-position, rotary action)

OFF - automatic boot sequencer off

• Dual Distributor Valves (DDV) and check valve heaters Timer and Monitor Unit (TMU) controlled

SLOW - automatic sequencing of deice boots with 3-minute cycle (144 sec dwell time) FAST - automatic sequencing of deice boots with 1-minute cycle (24 sec dwell time) MANUAL - DDV and heated check valve heaters on manually

• boots can inflate with manual selection of DDV valves using AIRFRAME MANUAL SELECT switch

AIRFRAME MANUAL SELECT SELECTOR (eight-position, rotary action)

OFF - (two positions)

• automatic sequencing of de-ice boots can be done

Boot detent - (six positions)

• inflates related boots by energizing related DDV
• AIRFRAME MODE SELECT switch must be at OFF or MANUAL
• a minimum dwell time of 24 seconds before inflating boots again

BOOT INFLATION ADVISORY LIGHT (green)

• related boot pressure is 15 psi or above

BOOT AIR SWITCH (two-position toggle)

NORM - isolator shut off valve energized open

• left and right bleed air systems connected

ISO - isolator shut off valve closed

• left and right bleed air systems isolated from each other
• boots must be selected manually

PROPS ADVISORY LIGHT (green)

• all blade heater elements of the related propeller are energized

PROP SELECTOR (rotary action)

TEST - each propeller will be heated separately for a cycle of 5 sec

• NP must be above 400 RPM (CL at MIN or greater)
• AC power must be available

OFF - propeller heaters not energized ON - propeller heaters controlled by Timer Monitor Control Unit (TMCU)

• all blades on one propeller come on, then the other propeller is heated
• the heating cycle is determined by TMCU using Total Air Temp (TAT) data
• the temperature must be less than 5°C
• NP above 400 RPM (CL at MIN or greater)