TM 1-1520-238-10 2-62 a. 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 panel illuminates. The rotary switch above the ON, OFF, and TEST toggle switch on the pilot ANTI-ICE panel provides manual override. When the rotary switch is turned out of the AUTO position, it permits manual control to select conditions that provide manual heating to the rotor blades for 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 input signals to a processor. These signals are proportional to liquid water content (LWC). The signals are sent to the ic- ing severity meter to give the pilot a numerical indication of intensity. The meter is marked with both intensities and categories of ice accumulation. A PRESS TO TEST switch is provided adjacent to the meter. When this switch is pressed, the meter pointer will move to 1.5. Both the BLADE de-ice and the PITOT AD SNSR switches on the pilot ANTI-ICE panel (fig 2-33) must be on for the ice de- tector/rate sensor to operate properly. LWC PRESS TO TEST M01-177 Figure 2-34. Icing Severity Meter and Press-to-Test Switch 2.44 RAIN REMOVAL. CAUTION Windshield wipers should not be oper- ated when canopies are dry. Scratches may result. Two wipers are mounted on the canopy frame to wipe the two windshields. Both wipers are electrically driven and are normally controlled by a four-position WSHLD WIPER rotary switch on the pilot ANTI-ICE panel. The pilot wiper moves horizontally and the CPG wiper moves vertically. They receive 28 vdc from the emergency dc bus through the WSHLD WPR circuit breaker on the pilot overhead cir- cuit breaker panel. Two speeds, HIGH and LOW may be selected by the pilot. To return the wipers to their static position adjacent to the canopy frame, the WSHLD WIP- ER knob is turned to PARK and held momentarily until the blades stop. The knob is spring-loaded from PARK to OFF. The CPG has limited control over the windshield wipers. Normally, the W WIPER switch on the CPG ANTI- ICE panel is left in the PLT position. When the switch is set at 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 and eleven deflectors. An upper cutter assembly is mounted on top of the pilot station canopy on the left side of the heli- copter. A lower cutter assembly is mounted on the bottom of the helicopter, forward of the gun turret bay. A main landing gear cutter assembly is mounted on each main landing gear strut by the lower step on the forward side of the strut. A PNVS cutter assembly is mounted on the top of 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 deflector assembly is mounted by the lower windshield on the right forward side of the CPG station. A tailboom jack pad de- flector assembly is mounted on the bottom of the tailboom just forward of the jack pad. A tail landing gear deflector assembly is mounted on the tail landing gear forward of the tail wheel. The wire strike protection system is de- signed to protect the helicopter from wire obstructions at low levels of flight.