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13 Cards in this Set
- Front
- Back
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State the purpose of a hydraulic patch test
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During normal operation, hydraulic systems become contaminated with both metallic and non-metallic particles. Particle contamination may result from internal wear or failure of system components, or incorrect maintenance and servicing operations. Provides a method of determining the particulate level in a hydraulic system, and the presence of free water or other foreign substances.
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.2 State the purpose of a Blade Inspection Method (BIM) indicator
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To monitor spar pressure. Compares a built in reference pressure with the pressure in the spar. When pressure in the spar is within limits, three white stripes show indicating that the main rotor blade is serviceable. If the pressure in the spar drops below minimum service pressure, the indicator will show three black stripes. A manual test lever is provided on the indicator
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.3 State the purpose for conducting flight control system rigging
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Rigging Navy model helicopter flight control system consists of coordinating stick and pedal motions in cockpit with correct blade angle at main and tail rotor.
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.4 State the purpose of a tactical paint scheme
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A color scheme designed for each aircraft type to reduce visual detection by matching the reflectance of operational surroundings. These schemes are composed of flat gray colors (color numbers 35237, or 336320, 26375, or 36495) with contrasting shades of gray.
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.5 State the two methods of locking/unlocking tail wheel lockpin
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Electrically and manually.
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State the factors that affect helicopter flight
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Lift - Force that acts in an upward direction (by virtue of the rotor blades and the low pressure cell they form.)
Weight - Force of gravity acting downward on the helicopter. Drag - The force that resists helicopter movement in its intended direction (caused by air friction). |
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State the factors that affect rotor blade lift
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Angle of Attack
Weight Drag |
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State the location and purpose of the main rotor head dampers
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Main rotor head dampers are installed between the hub and spindles to restrain hunting of the main rotor blades. The hunting motion occurs during rotor engagement and as the main rotor blades flap in flight. Each damper is filled with hydraulic fluid. Pressurizing the damper positions the main rotor blades full forward for blade folding.
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Explain how the following flight controls affect helicopter flight
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a. Collective stick [par. 26] - Pilot and copilot collective sticks are used to simultaneously change the pitch of all of the main rotor blades. The pitch change causes either an increase or decrease in lift on the entire main rotor disc.
b. Cyclic stick [par. 25] - The cyclic sticks are mechanically coupled lever-type controls. Both pilot and copilot have a cyclic stick with which they control forward, aft, and lateral movements of the helicopter. Controls the overall tilt of the main rotor disk. c. Rudder pedals [par. 24] - Pilot and Copilot pedals are mechanically coupled and control helicopter heading. Pedals contain independent toe-operated wheel brake master cylinders and are adjustable to the pilot and copilot leg lengths. Pedals contain switches, which can disengage the AFCS heading hold feature. |
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State what must be done for effective helicopter corrosion prevention.
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Complete flushing of the helicopter surface with clean fresh water shall be done daily after last flight, followed by a general wipe down and lubrication/preservation. Soap and water washing every fourteen days (seven at sea).
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State the two areas on the helicopter, which must have particular attention during a corrosion inspection
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Pay close attention to the underside of the helicopter structure and transmissions where moisture tends to collect.
Pay close attention to surface adjacent to or affected by, battery, acid fumes or engine exhaust. |
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State the approved cleaning materials and methods
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MIL-C-85570 Type I or II aircraft cleaning compound is the only alkaline cleaner authorized for use on this helicopter.
Remove excessive amounts of grease & oil with clean dry cloths. Normal Wash - 1:4 ratio (cleaning compound to fresh water) Light Wash - 1:9 ratio (cleaning compound to fresh water) Heavy Wash - 1:1 ratio (equal amounts cleaning compound, fresh water) Start at lowest point of section to be cleaned. Do not wash helicopter in direct or extreme heat. |
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State the purpose for emergency reclamation procedures
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To prevent further damage and will usually require further treatment at a higher level of maintenance
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