Introduction

The H-46A Sea Knight (figure 1-1) is a twin-turbine-powered, tandem-rotor helicopter, designed by The Boeing Company, Vertol Division. The primary mission of the CH-46A is to rapidly disperse combat troops, support equipment, and supplies from amphibious assault landing ships and established airfields, to advanced bases in underdeveloped areas having limited maintenance and logistic support, under all-weather conditions (instrument flight), day or night. The primary mission of the UH-46A is vertical replenishment and utility missions.

The H-46A fuselage is of semimonocoque construction and incorporates a cockpit, cabin, and aft pylon area. Entrance to the cockpit is gained through a doorway in the bulkhead separating the cockpit from the cabin. The cockpit area houses the flight controls, instruments, radios, and navigation aids necessary for completion of the mission. The cockpit controls and instruments are arranged so as to permit control of the helicopter from either the pilot's or copilot's station. Windshield anti-icing is accomplished electrically. Entrance to the cabin is made through the main entrance doorway, located on the forward right-hand side of the fuselage, or through the aft ramp and hatch area. The cabin is constructed with a constant cross section and has provisions for accommodating 25 troops, or 15 litters and 2 medical attendants. The cabin may also be used for carrying cargo, which may be loaded through the main cabin door, or over the rear loading ramp located in the aft cabin area. An integral cargo handling and rescue system is provided within the cabin. Using this system, one man can handle (load or unload) most loads in a minimum amount of time.

The cabin flooring consists of aluminum honeycomb panels with rigidized upper surfaces. The cabin floor and loading ramp incorporate parallel track and roller assemblies to facilitate loading and unloading. The cabin floor also incorporates tiedown fittings for the installation of seats and litters, and three longitudinal rows of tiedown fittings for securing cargo. Sidewall tiedown fittings are also provided along. the troop seat support rails. Cargo may also be carried externally using the external cargo hook, which can be installed within the rescue hatch located in the rear cabin floor.

The aft pylon houses two GE-T58-8B free-turbine engines and accessories, the aft transmission and combining box, two ac/dc generators, and the auxiliary power plant (app). The forward transmission is mounted above the cockpit. Synchronizing drive shafting, connecting the forward and aft transmissions, is routed through a tunnel located atop the fuselage. The engines simultaneously drive two tandem, three-bladed, fully articulated rotors through the combining transmission, the synchronizing shafting, and the forward and aft transmissions.

The rotor blades are of steel and aluminum construction, and are individually interchangeable within the corresponding rotor head. A steel "D" spar forms the leading edge of the blade and is the main structural member. Bonded to the "D" sparareaseriesof trailing edge boxes to which is bonded a continuous trailing edge strip, which completes the airfoil. A six element deicing blanket is bonded to the leading edge of each rotor blade. An automatic blade folding system enables the blades to be folded within the width of the landing gear, in approximately 1 minute. The blade folding mechanism is incorporated within the rotor head. Electrical power for blade folding and unfolding is supplied by the app-driven generator.

The alighting gear consists of two interchangeable main gears, one mounted on each stubwing, and a castering nose gear mounted on the fuselage beneath the cockpit. The main and auxiliary gear wheels and tires are interchangeable. Independent toe-operated, hydraulic brakes are...

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