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descends through 2500 feet above ground level (AGL) and disappears as the airplane
climbs through 2500 feet AGL.
Analog Radio Altitude Scale
A small window appears at the center of the scale as the airplane descends through
1250 feet AGL. This window marks the current radio altitude. This value is
numerically repeated in the bottom portion of the attitude indicator.
An analog radio altitude scale appears as the airplane descends through 1100 feet
AGL. This analog scale is used in conjunction with the ground bar (rising runway) to
assist in visualization of the aircraft’s height above terrain. The scale contains line
marks and single-digit numeric labels. Each digit indicates 100 feet of radio altitude.
At Decision Height (DH), the numeric label and scale change
from green to yellow.
Ground Bar (Rising Runway)
A ground bar displays on the analog radio altitude scale to represent the terrain. As the
airplane descends through 200 feet AGL, the ground bar rises on the analog scale. At 0
feet radio altitude, the top of the ground bar aligns with the center of the scale.
NOTE
FLIGHT INSTRUMENTS
11-46 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Radar Altimeter Display
Figure 11-25
P604_11_025
3000’
2500’
1200’
1100’
200’
0’
0
2
1
20
10
10
20
30
0FT
0
4
3
2
1
20
10
10
20
30
200FT
20
10
10
20
1
30
1100FT
20
10
10
20
1
29
1200FT
20
10
10
20
1
30
2500FT
10
10
20
30
1
Note: Not to Scale
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-47
P I LOT T R A I N I N G GU I D E
Standby Instruments
The standby instruments include an airspeed indicator, altimeter, attitude indicator and
compass.
Standby Instruments Locator
Figure 11-26
Standby Airspeed Indicator
The airspeed indicator supplies non-corrected (indicated) airspeed. It uses the standby
pitot source P3 and the standby static ports S3.
Standby Airspeed Indicator
Figure 11-27
400
350
300 250
200
150
100
60
KTS
IAS
Speed Pointer
Indicates speed readout
in knots indicated
P604_11_019
FLIGHT INSTRUMENTS
11-48 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Standby Altimeter
The standby altimeter incorporates an altitude pointer and an altitude counter. The
altitude pointer and altitude counter operate through a mechanical linkage connected
to a pressure capsule. The pressure capsule moves with changes in static pressure.
Barometric correction is selected by a knob at the bottom right of the instrument and
displayed in inches of mercury and hectopascals. The instrument receives its static
pressure from the standby static ports S3.
Standby Altimeter
Figure 11-28
Standby Attitude Indicator
The standby attitude indicator has an electrically-operated vertical gyroscope. The
gyroscope is mechanically connected to the sphere to show attitude information. To
cage or uncage the instrument, the PULL TO CAGE knob is pulled and turned. When
the instrument is uncaged, the cage knob is turned to adjust the pitch reference.
Standby Attitude Indicator
Figure 11-29
2 000
2
3
4
ALT
0
7 3
2
1
4
9
6 2992
5
1014
mb/hPa in Hg
Altitude Pointer and Scale
Pointer indicates altitude in
100-foot increments as read
from scale. Full circle for
each 1,000 feet of altitude.
Altitude Counter
Indicates barometric altitude
from - 1,000 to 50 000 feet,
in 1,000 foot increments.
Barometric Pressure
Indicators
Indicates selected barometric
pressure as expressed in
hectopascals or inches of
mercury.
P604_11_020
Barometric Set Knob
Used to change
barometric pressure
values as read at hPa/in Hg
readouts.
Range for this standby
Instrument is as follows:
from 952 to 1049 mb/hPa
and
from 28.02 to 30.99 in Hg.




PU
LL
TO
CAGE
CLI MB
DI VE
OFF
Roll/Sky Pointer
Indicates bank angles
referenced against
index.
roll
Roll Scale and Index
Markings at 10, 20, 30,
45 and 90 degrees.
Sphere
　
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