AFS-BH430-IBF-ICA
Aerospace
Filtration Systems, Inc.
Revision: B
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38
AFS Bell 230 and 430 IBF
to the restrictions on the title page
Instructions for Continued Airworthiness
See Table 3 for troubleshooting guidance.
8.5.2.4
Adjustment / Calibration / Repair
NOTE
If problems are suspected with the differential pressure switch, disconnect
the supply line
connecting the pressure switch to the static port and clean
and flush the line and static port.
The construction details of the component do not warrant field maintenance beyond that
noted above. Repair of this component requires the component to be sent back to AFS for
disposition.
8.5.2.5
Function Check
CAUTION
THIS PROCEDURE INTRODUCES THE POSSIBILITY OF ENGINE
FOD.
CAUTION
IMPROPER USE OF THE ALTIMETER TEST SET COULD RESULT IN
DAMAGE TO THE SWITCH AND/OR SWITCH CALIBRATION.
CAUTION
PULLING AN ALTITUDE OF GREATER THAN 1880 FEET ABOVE
FIELD ELEVATION WILL DAMAGE THE DIFFERENTIAL PRESSURE
SWITCH.
a.
Gain access to the DP
low pressure static port below the Bypass Door.
b.
Connect the low pressure calibrator or altimeter test set to the plenum side of the DP switch by
slipping a piece of 3/16 inch ID vinyl tubing over the end of the differential pressure switch
static port. Ensure that the fit between the tube and the static port is tight, i.e. no leakage.
c.
Ensuring that aircraft electrical power is ON, operate the test set to an indicated altitude above
the field elevation and gradually increase altitude. The differential pressure switch should
actuate and send a signal to the Cockpit Indicator illuminating the IBF “FILTER” light within
the following range:
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