Eurocopter AS 350 83 Flight Manual page 255

COMPLEMENTARY FLIGHT MANUAL
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2.1 Enaine-to-MGB Couolina
It transmits engine power to the MGB through a shaft and flexible
coupling turning inside a flared coupling tube. The shaft drives the
MGB input coupling by means of a pulley used to drive a hydraulic
PW'1J.
2.2 Main Gearbox (MGB)
The MGB consists of three interchangeable modules:
-an epicyclical reduction gear module with five planet gears providing a
4.33 reduction ratio.
-a bevel reduction gear module with a ring gear and pinion providing
. a further 3.59 reduction ratio.
This module is housed in two casings:
-main casing supporting a power takeoff coupling
.lower casing with MGB mounting provisions;
-a lubrication module attached to the lower casing.
Lubrication of the MGB is monitored through:
-a pressure switch causing the "MGB. p" light to illuminate on the
warning-caution-advisory panel when the pressure drops below 1 bar
(14.50 psi).
-a thermal switch causing the "MGB. T" light to illll11inate on the
warning-caution-advisory panel when the temperature reaches 11S'C.
-a magnetic plug that causes the "MGB CHIP" light to illuminate when
metal particles are present.
-as an optional equipment an MGB oil pressure and temperature indicator
can be fitted in addition to the lubrication monitoring system.
The power transmitted through the MGB is measured by a torsion-type
torquemeter fitted to the engine-MGB coupling shaft.
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100 % torque is equivalent to 853 Nm.
350 B3 7.6 .
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