TM 1-1520-238-102-62a. Rotor Blade De-Icing Rotary Switch Opera-tion.When the rotor blade de-ice system is operating,the BLADE ON advisory light on the pilot ANTI-ICE panelilluminates. The rotary switch above the ON, OFF, andTESTtoggle switch on the pilot ANTI-ICEpanel providesmanual override. When the rotary switch is turned out ofthe AUTO position, it permits manual control to selectconditions that provide manual heating to the rotor bladesfor TRACE, light (LT) and moderate (MOD) icing condi-tions.2.43.6 Icing Severity Meter.An icing severity meter(fig 2-34) is provided in the right portion of the pilot instru-ment panel. An aspirated ice detector sensing head, lo-cated on the doghouse fairing assembly, provides inputsignals to a processor. These signals are proportional toliquid water content (LWC). The signals are sent to the ic-ing severity meter to give the pilot a numerical indicationof intensity. The meter is marked with both intensities andcategories of ice accumulation. A PRESS TO TESTswitch is provided adjacent to the meter. When this switchis pressed, the meter pointer will move to 1.5. Both theBLADEde-ice and the PITOT AD SNSRswitches on thepilot ANTI-ICE panel (fig 2-33) must be on for the ice de-tector/rate sensor to operate properly.LWCPRESS TO TESTM01-177Figure 2-34.Icing Severity Meter and Press-to-TestSwitch2.44 RAIN REMOVAL.CAUTIONWindshield wipers should not be oper-ated when canopies are dry. Scratchesmay result.Two wipers are mounted on the canopy frame to wipe thetwo windshields. Both wipers are electrically driven andare normally controlled by a four-position WSHLD WIPERrotary switch on the pilot ANTI-ICE panel. The pilot wipermoves horizontally and the CPG wiper moves vertically.They receive 28 vdc from the emergency dc bus throughthe WSHLD WPRcircuit breaker on the pilot overhead cir-cuit breaker panel. Two speeds, HIGH and LOW may beselected by the pilot. To return the wipers to their staticposition adjacent to the canopy frame, the WSHLD WIP-ERknob is turned to PARKand held momentarily until theblades stop. The knob is spring-loaded from PARK toOFF. The CPG has limited control over the windshieldwipers. Normally, the W WIPER switch on the CPG ANTI-ICEpanel is left in the PLTposition. When the switch is setat CPG, the CPG wiper blade moves at low speed.2.45 WIRE STRIKE PROTECTION SYSTEM (WSPS).The WSPS (fig 2-35) consists of six cutter assemblies andeleven deflectors. An upper cutter assembly is mountedon top of the pilot station canopy on the left side of the heli-copter. A lower cutter assembly is mounted on the bottomof the helicopter, forward of the gun turret bay. A mainlanding gear cutter assembly is mounted on each mainlanding gear strut by the lower step on the forward side ofthe strut. A PNVS cutter assembly is mounted on the topof the TADS/PNVS. A gun turret deflector and cutter as-sembly is mounted on the forward side of the gun cradle.A forward and aft deflector are mounted on each of the pi-lot and CPG door hinges. An upper wiper deflector as-sembly is mounted by the upper windshield on the left for-ward side of the CPG station. A lower wiper deflectorassembly is mounted by the lower windshield on the rightforward side of the CPG station. A tailboom jack pad de-flector assembly is mounted on the bottom of the tailboomjust forward of the jack pad. A tail landing gear deflectorassembly is mounted on the tail landing gear forward ofthe tail wheel. The wire strike protection system is de-signed to protect the helicopter from wire obstructions atlow levels of flight.
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