Standby Instruments; Standby Instrument Group (Figure 5-9); Standby Altimeter; Standby Airspeed/Mach Indicator - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

STANDBY INSTRUMENTS

The standby instrument group (Figure 5-9) includes a barometric altim-
eter, a airspeed/Mach indicator, an attitude indicator, mounted on the
center instrument panel above the CWP and RMUs. The standby in-
struments have their own pitot-static probe to provide air data infor-
mation. The instruments are of traditional mechanical design. If a fault
occurs which causes one of the ADCs to output misleading information
to the PFDs, the standby instruments act as a useful comparison to in-
dicate which of the three displays is incorrect.
0
6
40
35
30
16
20
25

STANDBY ALTIMETER

The standby altimeter displays baro corrected altitude in a pointer/
counter drum display. The dial graduations are marked every 20 feet.
Above sea level the counter displays every 100 feet up to 55,000 feet of
operational range. The indicator has dual barometric correction, from
27.9 to 31 inches of mercury and 946 to 1050 hectoPascals. Back lighting
is provided by 5-vdc to illuminate the standby altimeter indicator at
night.

STANDBY AIRSPEED/MACH INDICATOR

The standby airspeed/Mach indicator provides indicated airspeed by
means of a pointer indicating against a 50- to 400-knot dial and a Mach
sub-dial ranging from 0.3 to 1.0 Mach. Maximum allowable airspeed
(Vmo) is indicated at 325 knots by a red radial mark on the airspeed di-
al. Maximum allowable Mach (Mmo) is indicated at 0.75 Mach by a red
and white striped radial mark on the Mach sub-dial. Back lighting is
provided by 5-vdc to illuminate the standby airspeed/Mach indicator
at night.
5-36
10
12
14
STANDBY INSTRUMENT GROUP
Figure 5-9
0
9
n Hg
8
ALT
2 0 0
51 000 FT
7
hPa
6
VIB
5
ON
TO TO
1
1013
2
3
2992
4
PM-132A