a) Airbox pressure sensor:
See Pic. 185 and 185/1.
The location of the airbox pressure sensor W 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 500 hPa to
2500 hPa and 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 min. + 3 V
max. + 15 V
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.
Divide the measured output
voltage (Ua) by the supply
voltage (Us).
◆ NOTE:
To calculate this pressure ra-
tio is required since the dia-
gram is effective over a volt-
age range and not just for a
single voltage.
Enter this ratio on Ua/Us axis,
go across. From intersection
with the straight line follow
down and read correspond-
ing pressure.
Max. allowance ± 40 hPa
00058
T
R
E
Pic. 185
966 502
airbox
pressure
2
00442
Pic. 185/1
Y
■ ATTENTION: At physical damage or readings outside allowance exchange
sensor without delay.
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