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a. Starting Procedure. c. Self Test. Press and hold HI SET Knob. The altimeter
will indicate a track condition as follows:
1.
2.
3.
LO SET knob - On.
1.
LO set bug - Set to 80 feet.
2.
HI set bug - Set to 800 feet.
3.
b. Track Operation. After about two minutes of
warmup, the altimeter will go into track mode with 4.
these indications:
1.
2.
3.
4.
3-72
5.
OFF flag - Not in view.
6.
Altitude pointer -0 to +5 feet.
OFF flag - Not in view.
Altitude pointer -1000 ± 100 feet.
Digital readout -1000 ± 100 feet.
LO warning light - Will be off.
HI warning light - Will light.
HI SET knob - Release. The altimeter will return
to indications in step b, Track Operation.
Digital readout -0 to +3 feet. 3.18.4 Stopping Procedure.
LO warning light - Will light. 1. LO SET knob - OFF.
TM 1-1520-238-10
CHAPTER 4
MISSION EQUIPMENT
Section I. MISSION AVIONICS
4.1 INFRARED COUNTERMEASURES SET
AN/ALQ-144A, 144(V)3. Data moved to Section III,
paragraph 4.342A.
4.2 RADAR COUNTERMEASURES SET AN/ALQ-136.
Data moved to Section III, paragraph 4.34B.
4.1 .l Infrared Countermeasures Set Control Panel. 4.2.1 Radar Countermeasures Set Control Panel.
Data moved to Section III, para. 4.34A.l. Data moved to Section III, para. 4.34B.1.
Change 4 4-1
TM 1-1520-238-10
4.3 FLIGHT SYMBOLOGY.
The flight symbology has four modes; cruise, transition,
hover, and bob-up. The symbology modes (fig 4-1) areselectable
using the flight symbology mode switch on
the cyclic. The symbols are defined in table 4-1.
When conducting sea operations the
velocity vector in the pilots symbology
will indicate the speed of the
aircraft relative to the earth and not
to the ship.
The pilot flight symbology, particularly the velocity vector,
is always driven by inertial velocity. The indicated
velocity is relative to actual motion over ground or water.
When attempting to move or hover near or over a
moving platform (such as a ship), the relative velocity
between the aircraft and the moving platform is different
than the true inertial velocity indicated by the velocity
vector. If hovering over a ship moving at 10 knots
through the water, the velocity vector will indicate 10
knots, not 0 knots, which is the relative velocity between
the aircraft and the ship. For this situation the
pilot must use visual cues to derive the actual relative
motion with respect to the moving platform. The velocity
vector must not be used as an indiator of relative
motion between the aircraft and moving platform, since
it will be inaccurate to the degree of the platforms’ velocity
through the water.
4-2 Change 4
28
TM 1-1520-238-10
Figure 4-1. Flight Symbology Modes
Table 4-1. Flight Symbology Definitions
Fig. 4-1
Ref No Symbol Name Description
1 LOS Reticle Represents the line-of-sight of the crew member selected sight. The
reticule will flash whenever the selected sight LOS is invalid or has failed.
The reticule will also flash whenever the "ACTIONED" weapon is in a
NO-GO state. The High Action Display will prompt the crewmember for
the appropriate condition.
2 Alternate Sensor Indicates to the crewmember the other crewmember sensor relative
Bearing bearing with respect to helicopter center line.
3 Lubber Line Index indicates helicopter magnetic heading.
4 Cueing Dots Indicates cued direction for target acquisition. All four dots present and
flashing indicate IHADSS boresight is required.
5 Command Heading Indicates heading to fly to next navigation waypoint designated by the
Doppler navigation system if bob-up mode of the flight symbology is not
selected. Indicates fixed heading reference when bob-up mode is selected.
Change 3 4-3
29
TM 1-1520-238-10
Table 4-1. Flight Symbology Definitions - continued
Fig. 4-1
Ref No Symbol Name Description
6 Acceleration Cue A vectorial representation of the helicopter longitudinal and lateral
acceleration; the display origin is normally the end of the velocity vector.
In the hover and bob-up modes, when the velocity vector exceeds its
maximum scale, the display origin changes to the center of the LOS
reticule. The Acceleration Cue will flash when the HARS inertial platform
has gone into free inertial mode, usually as a result of the LDNS going
into memory.
7 Velocity Vector A vectorial representation of the helicopter longitudinal and lateral
ground velocities; in hover mode, maximum scale is 6 knots ground speed;
in transition mode 60 knots ground speed. The velocity vector will flash
　
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