Maintenance Manual STEMME S10-VT
Date of Issue: Jan. 01, 1998
Page 3-38
Amendment Nr. 14
Date: Nov. 30. 2007
A4011121_B23.doc
Doc. No. A40-11-121
With the propeller-dome locked in open position and the electric master switch ON, the Engine Bus 3VV and
by this the TCU is energised. An automatic self-test is triggered by energising the TCU, including the two
TCU lights, which are lighted for 1-2 seconds during the self-test. If this is not observed, an inspection
ac
cording to the "Maintenance Manual (Line Maintenance) for ROTAX Engine Type 914 Series” is required
and the engine may not be operated until the problem is solved.
3.7.8 Instruments on the Instrument Panel
See also Fig. 3.2.a
Tachometer:
The electronic tachometer (ROTAX) is driven by a pulse, generated by the TCU.
Oil pressure
and
oil temperature
as a combined indication:
Indications are based on variable resistance, depending on the signal. Original ROTAX sensors are
installed. The Filser-indicators are tuned to the range of the ROTAX sensors. The oil temperature sensor
is screwed into the LH side of the oil pump housing (side to oil filter). The oil pressure transducer is
installed on the RH side of the oil pump housing.
Cylinder Head Temperature
of 2. cylinder (first on LH side) and 3. cylinder (last on RH side) as a
combined indication:
Temperature sensors are screwed directly into the cylinder heads thus measuring temperature of the
material directly. The temperature sensors are of temperature dependent variable resistance type.
Voltmeter
and
Ammeter
as a combined indication:
The indication on the voltmeter is the difference of voltage between the Main Bus and the common ground.
By selecting the electric master switch ON, the Main Bus is connected to the battery. Voltage on another
bus is indicated when operating a push-button. If this push-button is operated while the engine is not
running, the voltage of the optional additional battery (if installed) is indicated. When the engine is running,
the additional battery is charged via relay from the Main Bus. In this case, the voltage indicated when the
push-button is operated is also that of the Main Bus.
The signal for the ammeter is measured with a shunt (1 A / 1 mV). The shunt is installed between battery and
main relay, allowing to measure current to the electronic equipment. Only the energy for the engine starter
motor is taken directly from the battery.
Fuel Quantity,
combined indication for RH and LH wing tanks
The fuel quantity transmitter is of angular float-type, transforming angular motion to varying resistance.
3.7.9 Warning, Caution and Status Lights on the Instrument Panel:
See also Fig. 3.2.a
Warning, caution and status lights are combined on the RH side above the engine instrumentation. This
allows for good control of a/c and system status. Arrangement from left to right is:
Red
Fuel Pressure
warning (refer to section 3.4.6)
Green status indication for
Aux Fuel Pump operation
(refer to section 3.4.6)
Red warning light for
Manifold Pressure
(boost pressure, refer to section 3.7.7)
Yellow caution light for
Malfunction of TCU
, (refer to section 3.7.7)
Red warning light for malfunction of the
External Generator
(battery charge control)
The red generator warning light is ON, if the engine electric system is energised (master switch ON and
either propeller-dome open and locked or engine back-up switch ON) and the engine is not running.
During the engine running, the light indicates, that the battery is not being charged, either because the
generator switch is OFF or due to malfunction of the generator.
