TM 55-4920-390-13&P
TABLE 4-1. OPERATING CONTROLS AND INDICATORS
Control or
(See Fig. 1-2,
Index No.
Indicator
Function
Location 1-4 and 1-6.)
1.
Pilot Indicator
Illuminates when 28 VDC is
On Bulkhead
Light
applied to unit.(However,
no power is applied to elec-
tronics section until trigger
is depressed.
2.
Position control
Positions pattern in azimuth,
On Bulkhead
and enables "inhibit" circuit
to operate and maintain dis-
play of all targets. (See 1-
14)
3.
Pistol grip
Constitutes power switch
On hand-held lamp.
trigger switch
and applies 28 VDC to
electronics. Activates unit.
4.
Multi-turn
Adjusts frequency of locked
On rear of hand- held lamp.
Dial
osciIlator
5.
Vernier
Fine tunes oscillator and
On rear of hand- held lamp
when turned full CCW
.
disables oscillator.
On inner lid.
6.
Dial Setting
Used to determine setting
Chart
for Multi-turn dial and
position control.
4-7. PROCEDURE FOR TRACKING. With the helicopter equipped as in 4-3 thru 4-5, proceed as folllows to accomplish
a "track".
a) Open case and remove hand-held lamp as in Fig. 1-1, c.
b) Calculate "blades-per-minute" for the particular helicopter being tracked by multiplying known main rotor RPM
by number of blades.
c) Use graph (Index #6, Table 4-1, Figure 4-1) to determine setting of Multi-turn Dial and Position control. Set dial
and control.
4-4
