Learjet 60 - Page 166

Learjet
60

Pilot's Manual
AIR DATA SYSTEMS
Air data for instruments and equipment
requiring
flight
environment
air
data
for display or operation is provided by two separate
air data
systems
. The dual primary air data system consists of
the primary pi-
tot-static system, two
air data computers, two air data
reference pan-
els (ARP), a total temperature
probe and reversionary mode
switch/
annunciators . A separate standby
pilot-static system is installed
to
provide flight environment air data
for display on the standby instru-
ments .
PRIMARY PITOT-STATIC
SYSTEM
Pilot
and static pressure for the air data
computers and other
using
systems is
obtained from the two primary
pilot-static probes .
One
probe is
located on each side of the
nose compartment . Each
probe
contains a pilot
(impact pressure) port
and two static pressure
ports .
The probes
also contain electrical heating
elements controlled by
the
L and R PITOT
HEAT switches . Four
drain valves, located near
the
nose gear
doors, are installed at the
system low spots to drain
mois-
ture from
the system . The pilot's pitot
system is completely indepen-
dent of the
copilot's pilot system and utilizes
the left pilot-static
probe
as the source of
pilot pressure . The
copilot's system utilizes
the right
pilot-static
probe to obtain pitot
pressure . The pilot's and
copilot's
systems
each utilize a separate static
source on each of
the probes . A
solenoid-operated shutoff valve
is installed in each static
source line
to
assure accurate static pressure
in the event
one probe becomes
clogged
or unreliable . The
shutoff valves are
controlled through the
STATIC SOURCE switch
on the pilot's
switch panel and operate
on
28 VDC supplied through
the 7 .5-amp STATIC
SOURCE circuit
breaker on the
copilot's circuit breaker
panel .
The pilot's pilot
source supplies pitot
pressure for ADC
1 air data
computer . The
copilot's pilot source supplies
pitot pressure
for ADC
2 air data computer
.
Each pilot-static
probe contains two
static sources . One static
source
on
each probe is interconnected with
a static source on
the opposite
probe to supply
static pressure to
ADC 1 . The other static
source on
each probe is
interconnected with a
static source on the
opposite
probe to supply
static pressure to ADC
2 . In the event a static
source
becomes
clogged or unreliable, the
affected pilot-static probe's
static
sources
can be isolated, allowing
all equipment to be operated
from
static
sources on the opposite probe .
PM-123

5- 2 3
Change 2