PITOT-STATIC SYSTEM
There are two heated tubes installed—one on
each side of the nose compartment.
There are five static ports—two on the pilot’s
side and three on the copilot’s side of the nose.
All are heated except for the rearmost port on
the copilot’s side.
The rearmost static port on the copilot’s side
provides a static source for the pressurization
module.
This port has a backup port in the nose com-
partment should the external port become
clogged.
Two shoulder static ports for the air data sen-
sor, if installed, or the autopilot altitude con-
troller are located on top of the nose, forward
of the windshield.
Two nonheated static ports are located inside
the nose compartment. One is used by the cabin
altitude controller. The other is the alternate
static source for the pilot’s instruments.
A static port in the tailcone compartment pro-
vides ambient air pressure for operation of
the cabin safety valve.
OXYGEN SYSTEM
The oxygen system consists of the crew and
passenger distribution systems connected to
a high-pressure oxygen storage cylinder lo-
cated in either the nose compartment or the
dorsal fin of the vertical stabilizer. The flight
crew is provided with pressure-demand or di-
luter-demand masks. Constant-flow masks are
provided for the passengers. The passenger
masks may be deployed either manually at
any cabin altitude or automatically if cabin al-
titude increases to 14,000 feet.
STATIC OR LIGHTNING STRIKE
PROTECTION
The radome is protected with four aluminum
tapes bonded and grounded to the fuselage.
Static dischargers are installed on the trail-
ing edges to dissipate static electricity with
a minimum amount of radio interference
(Figure 1-17). The static dischargers are in-
stalled on the tip tank fins, tailcone vertical
fin, navigation light fairing, and elevator
trailing edge.
1-18
FOR TRAINING PURPOSES ONLY
LEARJET 20 SERIES PILOT TRAINING MANUAL
FlightSafety
international
Figure 1-17. Static Wicks (Typical)
