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3.17.3.3 Burst Mode. The burst mode allows the pilot to control the interrogation output of the PLS. When the T/R INTG key is pressed, the unit interrogates for less than 4 seconds. Data from the responses is then displayed on the instrument panel display.
3.17.3.4 Continuous Mode. This mode provides con-stant interrogations to the survivor’s radio. Readouts from this mode include DME slant range distances in nautical miles for distances over 9900 ft, and in feet for distances under 9900 ft.
3.17.3.5 Homing Mode. PLS homing mode provides bearing information only from the source. Bearing indica-tions greater than 25° off the nose of the helicopter should be used for turning direction only. The pilot must determine to or from direction of the radio source by signal strength/ sound or the aid of the radio source operator. If constant transmissions from the radio source operator is not pos-sible, request short transmissions as necessary to identify radio location.
3.17.4 Normal Operation.
3.17.4.1 Starting Procedure.
NOTE
The radio will transmit for approximately
1.5 seconds during BIT. If radio silence is required, turn MODE switch directly to FREQ.
1.  
MODE switch -BIT.

2.
Observe display, as all segments light up, and BIT PASS or (LRU) FAIL is displayed.

3.17.4.2 Operation.
1. Set up PLS for survivor radio operation.
a.  
MODE switch -FREQ.

b.  
CHAN switch -A or B, as desired. Dis-play reads FREQ followed by six dashes.

c.  
CLR switch -Press, to clear the display. Flashing cursor display indicates that unit is ready for frequency selection.

d.
Select  desired frequency with number keys. To enter frequency in memory, ENT key -Press.

e.  
MODE switch -CODE. SVR display will indicate 1, and CDU display indicates CODE, with six dashes.

f.  
CLR switch -Press, to clear the display. Flashing cursor display indicates that unit is ready for code selection.

g.
Select desired code with number keys. To enter code in memory, ENT key -Press.

h.
To enter code for survivor No. 2, 2 -Press. Repeat Steps f. and g. to enter survivor codes in system.

 

i. Repeat Step h for each additional survivor code to be entered (up to 9), using numbers 3 through 9 in place of 2.

2. Normal Operation.
a.  
Set MODE switch -As desired.

b.
Set CHAN switch -As desired.

c.  
Select survivor code number with number keys.

d.
If  BRST mode was selected, TR/INTG button -Press, to interrogate radio source. Display will brie.y read INTG, when in-terrogation is taking place. RCU will then give distance and bearing to survivor, if interrogation was successful. If not, NO UPDT will appear.

e.  
If CONT mode was selected, TR/INTG button -Press, to interrogate a beacon. Dis-play will read INTG, indicating continu-ous interrogation. RCU will give distance and bearing to survivor, if interrogation was successful. If not, NO UPDT will ap-pear when TR/INTG is pressed to end in-terrogation.

 

3.17.5 Stopping Procedure.
1.  MODE switch -OFF.
3.18 GYRO MAGNETIC COMPASS SET AN/ASN-
43.
Gyro Magnetic Compass Set AN/ASN-43 provides heading information by reference to a free directional gyro when operating in the FREE mode, or by being slaved to the earth’s magnetic .eld when operated in the SLAVED mode. It provides heading information to the horizontal situation indicator. Power to operate the AN/ASN-43 is provided from the ac essential bus through circuit breakers, marked COMP and AUTO XFMR under the general heading AC ESNTL BUS.
3.18.1 Compass Control C-8021/ASN-75. Control C-8021/ASN-75 (Figure 3-28) is required to synchronize (electrically and mechanically align) the AN/ASN-43 to the correct magnetic heading when used in the SLAVED mode of operation. The synchronizing knob on the control panel may be used as a set heading knob for operation in the FREE mode.
　
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