Engine

Overview

The OH-58D Kiowa Warrior is equipped with a single Rolls-Royce Allison turboshaft engine that powers the rotors through the transmission system. The engine is comprised of a two-stage gas producer turbine and a two-stage power turbine assembly. It is air-cooled and provides power to the aircraft via the AC and DC generators and the PMA.

Controls and Switches

Throttle

A twist grip throttle is available on the Pilot and Copilot Collectives.

The throttle regulates fuel flow to the engine via the Hydromechanical Unit (HMU) when the FADEC is in Manual mode or in Automatic mode and the throttle is below 65%.

The throttle includes a stop at the IDLE position to prevent accidental moving of the throttle to the OFF position.

The Idle Release Button allows the throttle to be rotated below the IDLE position.

Ignition Keylock Switch

The Ignition Keylock Switch is a security key switch which controls power to the ignition system. The Ignition Keylock Switch can be found under the Collective.

Start Switch

The Start Switch is found on the Pilot Collective Grip and is a momentary switch that actuates the engine starter system.

Ignition Circuit Breaker Switch

The Ignition Circuit Breaker Switch is found on the Overhead Console Panel and provides electrical power to the ignition system.

Fuel Boost Switch

The Fuel Boost Switch activates the fuel boost pump, assisting in providing fuel to the engine during critical operating periods.

Engine Anti-Ice Switch

The Engine Anti-Ice Switch controls the engine inlet anti-icing system, causing hot air to flow over the engine inlet and prevent build-up of ice.

Engine Oil Bypass Switch

The Engine Oil Bypass Switch is not functional.