Chapter 7
ZLIN AIRCRAFT a.s.
Description of the aircraft and its system
Flight Manual
Z 242 L
REVISION No. 3
7 - 20
EASA Approved
25.2.2017
7.25.3
Engine instruments
The engine run is monitored by the following:
The oil pressure: is draw from engine back wall (above the right magneto) and is divided in two
branches. The first one is terminated with an oil pressure transducer, in which the pressure is
converted into an electrical signal. The second branch is terminated with the minimum oil
pressure switch (when the oil pressure drop under the minimum value, the "OIL PRESS. LOSS"
light on the annunciator pa
nel is “ON”).
The oil temperature: is measured by means of a resistance gauge located into the oil filter
adaptor.
The fuel pressure: is draw from the injector body (engine priming pumpe) and across pressure
transducer is converted into an electrical signal.
The actual fuel consumption: is measured indirectly, sensing is pressure in engine injector
installation.
The thermoelectric sensor of the cylinder heads temperature: is located in the head of the right
rear of cylinder.
Thermoelectric sensor of the exhaust gas temperature (EGT): is located in the exhaust manifold
of the right rear of cylinder.
The engine speed indicator: is of the mechanical type and is driven by a flexible shaft connected
to the drive on engine back wall.
The manifold pressure: is draw from the first right cylinder manifold
NOTE:
The indication of the oil temperature, oil pressure, fuel pressure and actual fuel consumption are
combined into four pointer indicator.
7.25.4
Engine starting and engine ignition
The ignition system consists of two magnetos, bunched hi-voltage cables and ignition fuses. The
magnetos are located on the engine back wall. The ignition sequence follows the pattern is 1-3-
4-2.
To facilitate engine starting is left magneto is provided an impulse coupling.
The engine is equipped with an electrical starter.
Use of the ignition switch:
The individual position of the ignition switch :
“OFF“
- ignition is switched OFF
"L"
- only left magneto is switched ON
"R“
- only right magneto is switched ON
“BOTH“
- both magnetos is switched ON
"START"
- both magnetos is switched ON and starter is activated
After releasing the spring returns the switch into the position “BOTH“.