Pilot’s Operating Handbook Section 7
EXTRA 500 Description of Airplane and Systems
7.23 Pitot/Static Pressure Systems
Providing pitot and static pressure for the pilot’s and copilot’s
instruments two independent systems are installed. Each system
consists of a heated pitot head located at about 3/4 of the wing
span, the tubing, and a drain located on the pitot head. The
heated dual static ports with 2 static lines each are located on
both sides of the rear fuselage. The two drains are located at the
bottom of the fuselage between the gear doors behind the nose
gear.
7.23.a Pitot Head and Static Port Heat
The pitot head and static port heating is divided into a left and
right hand system. The systems are controlled by the
L-PITOT-R
switches located on the
DEICE section of the left side panel.
Circuit protection is provided by
PITOT-L and PITOT-R circuit
breakers. The pitot/static l/h heating circuit is the main system
and located on the
EMERGENCY BUS section of the pilot’s left
side breaker panel. The r/h pitot/static heating circuit is located
on the
LOAD BUS section of left side circuit breaker panel.
Integrated in the r/h pitot/static heat circuit and on the same
circuit breaker is the stall warning heating, thus also located on
the
LOAD BUS section. Both pitot/static heat systems are
deactivated by the landing gear squat switch to avoid
overheating on the ground. If the
PITOT switch is placed in the
ON position while the aircraft is sitting on the ground the two
yellow PITOT HEAT, STATIC HEAT and the red STALL HEAT
lights will illuminate on the annunciator panel indicating that
heating is not active. The yellow PITOT HEAT and STATIC
HEAT annunciations will only extinguish if the respective
system is actually working. The pitot/static heat system can be
ground checked prior to flight by holding the
PITOT switches in
the
TEST positions for no longer than 10 seconds. While the
PITOT switches are in the TEST position the two PITOT HEAT,
STATIC HEAT and the STALL HEAT annunciations will not
illuminate if the systems are operational, indicating the systems
are working.
26. January 2011 7-65
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