DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE:
CHAPTERPAGE 356
MAINTENANCE MANUAL STEMME S12
3.7.20 FUEL PRESSURE INDICATING ATA 733200
3.7.20.1 DESCRIPTION
The ROTAX 914 engine requires the measurement of fuel pressure in relation to the “upper deck”
air pressure of the turbocharger system. Therefore a dierential pressure sender is installed which
generates a voltage output of 0 V … 5 V proportional to the dierence between regulated fuel
pressure and air box pressure. This voltage is displayed to the pilot on a dedicated digital voltmeter
in the engine portion of instrument panel.
The operational range of 150 mbar … 350 mbar is marked on a placard close to the voltmeter.
The fuse for the fuel pressure indicator system is located in the instrument panel junction box
(engine bus).
3.7.20.2 PARTS SPECIFICATION
Part STEMME p/n Manufacturer p/n
Dierential Pressure Indicator 831.123 UMA N1EU07D
Indicator 851.147 Conrad 134473
3.7.20.3 OPERATION
If the fuel pressure exceeds the limits, the pilot has to check the available amount of fuel and the
state of the tank selector and the auxiliary fuel pump. Instructions about appropriate corrective
actions are included in the S12 Aircraft Flight Manual.
3.7.21 FIRE DETECTION SYSTEM ATA 261200
3.7.21.1 DESCRIPTION
Two bimetallic thermal switches are positioned on the upper rewall directly above the carburetors
to detect increasing temperatures. At temperatures above 160°C the switches (or at least one)
open the control circuit of a relay. This activates a red warning light and a piezo signal horn. The
system includes a test switch on the panel.
3.7.21.2 PARTS SPECIFICATION
Part STEMME p/n Manufacturer p/n
Thermoswitch Microtherm R20 10AM-F01 on request
Switch with indication light - housing 10AM-F02 on request
Switch with indication light - cap 10AM-F03 on request
Switch with indication light - bulb 10AM-F04 on request
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