COMCO IKARUS
Maintenance Manual C42 Series
MaintenanceManual C42-
Series_Issue_VII_18.02.2014.doc
Revison No.:1 79 from 107
4.3.8 Inspecting the pitot-static pressure system
This inspection can be carried out with special measuring equipment. If such
equipment is not available, the inspection may be undertaken using simpler means.
The inspection is carried out by two people. A clean and leak-proof injection syringe
and a short piece of appropriate and elastic tubing (inner diameter 5 mm) are
needed.
4.3.8.1 Pitot pressure system:
1. The tubing is attached air-tight to the pitot tube on the left wing.
Figure 75: Checking the pitot pressure system
2. One person slowly presses the syringe so that overpressure results in the
system. At the same time, the second person watches the airspeed indicator.
The syringe is pressed until a speed between 60 and 180 km/h appears on the
indicator. The syringe must be pressed very carefully to ensure that the
airspeed indicator is not over-wound and irreparably damaged.
3. Once the desired speed has been reached, the second person continues to
watch the airspeed indicator. The indicated airspeed must not fall by more
than 3 km/h per minute. The first person makes sure that syringe does not
yield to the overpressure in the system.
Should the airspeed fall faster, this does not necessarily mean that there is a leak in
the pitot pressure system. A leak in the syringe and the connection to the pitot tube
should first be ruled out and the cause identified and repaired in an IFC / ISC,
respectively.
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