PD9B01M0 1ST ISSUE 1/07/2019 25
2) Coolant/Cylinder head temperature indicator;
3) Oil pressure indicator;
4) Fuel pressure indicator;
5) Engine Rpm indicator;
Sensors related to the above mentioned instruments are located as follow, see ANNEX A (Engine
group):
1) Oil temperature sensor is located on the Engine oil pump tube and is marked
with “TO” on the
pump flange;
2) Coolant/Cylinder head temperature sensors are located on cylinders 2 or 3;
3) Oil pressure sensor is located on oil tube;
4) Fuel pressure sensor is shown in ANNEX A (Engine group);
5) Engine Rpm sensor shown in ANNEX A (Engine group).
8.2 Pitot-static system
The Pitot system senses dynamic pressure through a custom tube that is aligned with the flow of
air and is located under the leading edge of the right wing. The pitot installation and layout is
described in ANNEX A (Dashboard & Instrument group).
The static pressure source for each instrument is derived by a dedicated tube used to measure
only static pressure and not dynamic pressure. Because of this, the indications for airspeed,
altitude, and rate of climb are not affected by opening the windows, door, or cabin air vents.
Because of moisture formation possibility into the airspeed system, a drainage operation should be
performed very frequently. It is made by
disconnecting the cap that closes the “T” fitting just
outside the fuselage lower skin, below the right wing root.
Servicing the system is very effortless and, according to the checklist reported in
ANNEX A
(Dashboard and Instruments group), it can be carried out
by simply removing the tubes from the
instruments and blowing air in the direction of the ports and never vice versa, clearing possible
obstructions and checking line condition.
Visually and frequently check the pitot tube and static ports to assure they are clear of possible
obstructions.
For safety reasons and in order to ensure correct airspeed readings, it is important to check the
airspeed system for leaks adopting the following procedure:
✓
connect a piece of rubber hose approximately 30 centimetres (12 inches) long to the pitot tube,
✓
close off the opposite end of the hose,
✓
slowly roll it up until the airspeed indicator shows cruise speed.
A steady reading is an indication the system has no leaks.
WARNING
AVOID BLOWING AIR THROUGH PITOT OR STATIC PORTS, AS THIS CAUSES IMMEDIATE
DAMAGE TO THE AIRSPEED INDICATOR.
9 Electrical system
The main sources of electrical energy are a 12-volt DC battery and a 14-volt DC alternator.
The system has over voltage protection and an integral voltage regulator. The main battery is
located inside the engine cowling and positioned on the firewall left bottom area (pilot view). The
relevant electric powered devices get their direct power through the circuit breakers.
