ENSTROM 280FX - Transmission System; Rotor System

7-10 ENSTROM 280FX OPERATOR’S MANUAL
Rev. 9
Report No. 28-AC-020 Nov 5/13
7-9. Transmission System
The main transmission unit provides an RPM reduction
between the engine and the main rotor. The transmission
incorporates a freewheeling unit in the upper pulley assembly,
which is mounted on the pinion input shaft. The freewheeling
unit provides a disconnect from the engine in the event of a
power failure and permits the main and tail rotors to rotate in
order to accomplish safe autorotation landings. The main rotor
transmission has a sight gauge that is located on the aft right-
hand side and is visible through the top step kick-in panel on
the right side of the helicopter.
A main rotor transmission temperature gauge is located on the
instrument panel and is red-lined at 225°F.
The tail rotor transmission, mounted at the aft end of the tail
cone, supports and drives the tail rotor. The tail rotor
transmission is equipped with a self-contained lubricant
supply and a visual lubricant level gauge at the rear of the
housing.
Both transmissions are equipped with quick disconnect chip
detectors which are connected to aviation yellow caution lights
(MRGB CHIP and TRGB CHIP) in the annunciator panel.
7-10. Rotor System
1. Main Rotor
The main rotor is a three-blade, fully articulated system.
The fully articulated system in the 280FX helicopter is
designed to provide smooth control responses in all modes
of flight. Sufficient kinetic energy stored in the heavy rotor
blades allows safe autorotation landings in the event of
power failure. The rotor assembly consists of three all-metal
bonded blades, upper and lower rotor hub plates, universal
blocks, blade grip assemblies, and hydraulic lead-lag
dampers.
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