EUROCOPTER
FLIGHT MANUAL BO 105 CB-5/CBS-5
7 - 16
MANUFACTURER’S DATA
Rev. 0
7.6.4 Annunciators
LOW FUEL warning light is activated by a fuel level float switch, located in the supply
tank, when the supply tank usable quantity is below 60 kg. The LOW FUEL warning light
circuit, powered from the Main Bus via a fuse, can be functionally tested by pressing the
LOW FUEL TEST pushbutton located on the center console switch panel.
FILT 1, FILT 2 warning lights will be activated when the engine-mounted filter becomes
clogged. The FILT warning lights circuit is powered from the Main Bus via a fuse.
7.7 POWER TRAIN (see Fig. 7-9)
The power train transmits engine power to both rotors and the transmission-mounted ac-
cessories. The power train comprises two engine drive shafts, a main transmission with
accessory drives, tail rotor drive shafts, an intermediate gearbox, and a tail rotor gearbox.
7.7.1 Main Transmission (see Fig. 7-9)
Mounted forward of the engines above the cargo compartment, the main transmission
combines the two engine drive shaft inputs and provides drive to the main rotor, tail rotor,
accessories, and oil cooler fan. Two freewheeling units at the main transmission inputs
permit either engine to be disengaged from the transmission during single-engine opera-
tion or both engines during autorotation.
Power from the engines is transmitted through various stages of reduction gearing to ob-
tain the necessary speed for the main rotor and tail rotor. Two hydraulic pumps and a rotor
rpm (N
Ro
) tachgenerator are driven by the accessory gearbox mounted on the transmis-
sion left side. Mounted on the transmission right side is an oil cooler blower fan and re-
duction gearbox assembly.
7.7.2 Main Transmission Oil System
The main transmission oil system lubricates and cools transmission components. An oil
pump mounted on the bottom right of the transmission, suctions oil from the sump through
a filter screen and feeds it then to a fine-mesh filter mounted on the forward side of the oil
cooler assembly. The filter incorporates a bypass to ensure oil circulation in the event of
filter clogging. Oil from the filter then flows to the oil cooler which is fitted between the two
engine oil coolers. The cooled oil is then returned to a transmission case manifold fitting
located on the aft side below the tail rotor drive and between the two input drives. An ex-
ternal line from the manifold fitting supplies oil for the pressure sensors. Passages within
the transmission casings distribute oil to jets used in spraying critical components.
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