Rotax 914 F Maintenance Manual page 219

1
966 507
ambient
pressure
R EW
00058
Pic. 186
Ua/Us
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0,0
00441
Modification no.
- 0 -
b) Static pressure sensor:
See Pic. 186.
The location of the static pressure sensor Q depends on type of aircraft, but
is limited by the length of the wiring harness.
ATTENTION: The sensor is designed for a pressure range of 100 hPa to
1200 hPa and the max. pressure must not exceed 3500 hPa.
If during the course of measuring the max. pressure is exceeded, the sensor
has to be exchanged.
When taking the following readings the plug connection to the wiring harness
has to be severed and straight after completion of checks re-established. The
same applies for the air pressure hose.
The easiest way to check function of the two pressure sensors is by use of the
communication program. If this program is not at your disposal, the following
static checks can be carried out.
Inspect for physical damage
Static check for function of airbox pressure sensor:
Allowcation of connections for test set-up / legend to Pic. 185
E Voltage output Ua
R Grounding (øV)
T Voltage supply Us
Y Pressure input
Test set-up
Connect pin R to ground and connect pin T with plus side of voltage supply
Us. Let test pressure act upon sensor Y. Take reading of voltage out put
between pin R und pin E.
ATTENTION: At physical damage or readings outside allowance exchange
sensor without dealy.
Reference
min. + 3 V
max. + 15 V
Divide the measured out put
voltage (Ua) by the supply volt-
age (Us).
NOTE:
To calculate this pressure ratio
is required since the diagram
is effective over a voltage range
and not jsut for a singel volt-
age.
Enter this ratio on Ua/Us axis,
go across. From intersection
with the straight line follow
Pic. 186/1 down and read corresponding
pressure.
Max. allowance ± 60 hPa
Druck [hPa] absolut
pressure absolute
Main
914 F
Date
Page
1997 02 01
219