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(7) MODE 4  Press to toggle ON or OFF as
transponder set to NORM. All individual tests can be
desired.
run simultaneously. A GO or NO GO will display when
a test sequence has completed.
NOTE
b. Controls and Function (fig. 3-52 and 3-53).
Transmitting or being interrogated in CODE
c. Preflight Checks.
A momentarily displays a flashing IFF
message at lower edge of each MFD.
(1) IFF key (on MFK or COMM page)  Press.
T r a n s m i t t i n g i n CODE A and b e i n g
interrogated in CODE B activates an audio
(2) Desired transponder code  Select.
visual signal and vice versa.
(3) STBY/NORM key  Press to display NORM.
(8) MODE 4 CODE key  Press to toggle A or B
(4) PAGE 2 key  Press. as required.
(5) M1 TEST key  Press. (9) MODE 4 HOLD key  Press to set as
desired.
(6) M2 TEST key  Press.
(10) AUD VIS key  Press to toggle desired
(7) M3 TEST key  Press. response to an interrogation.
(8) M4 TEST key  Press. NOTE
(9) MC TEST key  Press.
If Kit 1C is not installed, the display should
(10) After GO is displayed adjacent to each line, be toggled to OFF. AUD VIS should be
PAGE 1 key  Press. toggled to OFF to eliminate IFF CAUTION
displaying during flight.
(11) STBY/NORM key  Press to display STBY.
(11) PAGE 2 key  Press.
d. Operation.
(12) MC ALT key  Press to toggle ON or OFF
(1) IFF key (on MFK or COMM page)  Press. as desired.
(2) STBY/NORM key  Press to display NORM. (13) ANT key  Press to set as desired.
3-100
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
PAGE 2
STBY NORM
M1 ON
M2 OFF
M3 A+C ON
KYBD
MODE 4
OFF
A B CODE
HOLD
AUD VIS OFF
IFF
10 1
9
8
7
6
2
3
4
5
406075-397-1
J1428
IFF
M1 03
M3A+C 0000
CONTROL/INDICATOR FUNCTION
1. MODE 4 ON/OFF key Selects mode 4 ON or OFF condition.
(CDS4) MC ALT key Selects ON or OFF condition for altitude reporting to a Mode C
interrogation.
2. A/B CODE key Selects mode 4 code A or B.
(CDS4) MODE 4 ON/OFF Selects mode 4 ON or OFF condition.
key
3. HOLD key Selects hold for the mode 4 function.
(CDS4) A/B CODE key Selects mode 4 code A or B.
4. AUD/VIS/OFF key Selects the method whereby mode 4 interrogation will be reported.
5. PAGE 2 key Selects page 2 of IFF Display pages.
6. KYBD key Accepts MFK input for M1 and M3.
Figure 3-52. IFF Display Page 1 (Sheet 1 of 2)
3-101
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
7. (CDS2/CDS3) M3 A+C ON/ Selects mode 3 ON or OFF condition.
OFF key
(CDS4) M3A key Selects mode 3 ON or OFF condition.
8. M2 ON/OFF key Selects mode 2 ON or OFF condition.
9. M1 ON/OFF key Selects mode 1 ON or OFF condition.
10. STBY/NORM key Selects standby (warmup) or normal receiver condition.
Figure 3-52. IFF Display Page 1 (Sheet 2 of 2)
3-102
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
VSD HSD MMS COMM
IFF
1
2
3
9
8
7
6
5 4
M1 TEST
M2 TEST
M3A TEST
M4 TEST
MC TEST PAGE 1
RAD TEST
OFF
ANT
TOP
MC ALT
OFF
406075-397-2
J1428
IFF
M1 03
M3A+C 0000
CONTROL/INDICATOR FUNCTION
1. (CDS3) MC ALT key Selects ON or OFF condition for altitude reporting to a mode C
interrogation.
2. ANT key Selects antenna to be monitored.
3. RAD TEST key Selects ON or OFF conditions for test of radiation portion of mode 4.
4. PAGE 1 key Returns display to PAGE 1.
5. MC key Initiates mode C self-test.
6. M4 key Initiates mode 4 self-test.
7. M3A key Initiates mode 3 self-test.
8. M2 key Initiates mode 2 self-test.
9. M1 key Initiates mode 1 self-test.
Figure 3-53. IFF Display Page 2
3-103
TM 1-1520-248-10
SECTION V. (CDS2) ENGINE HISTORY PAGES
3-81. ENGINE HISTORY PAGES. HISTORY display consists of two pages. Pressing R-5
key on either of the pages selects the next page. The
ENGINE HISTORY Pages (Fig. 3-54 and Fig. 3-55) page number is shown at the top of the display after
display maximum engine values and trend data the text ENGINE HISTORY. An exit to the FDL MENU
gathered from trend data and other engine data such is made by pressing the mode select button labeled
as the number of engine starts while the helicopter is MENU or the INIT button on the MFD auxiliary control
　
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