1. 1-212th AVN
APX 118 Orientation

3. AN/APX-118 COMMON DIGITAL TRANSPONDER (CXP) OPERATOR
ORIENTATION TRAINING
Purpose: Give the IP enough information that aircraft with the APX 118 installed will not have to be rejected.
CXP Overview
System Intro / Orientation
Operating Procedures
Crypto Load Procedures – NOT COVERED
BIT checks
RCU Menus / Key Board Operation
Questions

4. There will be a four hour plus class in the future to cover all the intricate details of the entire system

5. REMOTE CONTROL UNIT
(Control Head)

6. AN/APX-118 COMMON DIGITAL TRANSPONDER (CXP)
RT-1836(C)
The RT installed with antennas and the RCU, the transponder provides identification, altitude and surveillance reporting
The transponder provides operational capabilities for Mark XII IFF.
1. SIF Modes 1, 2, 3/A, and C
2. Mode 4 when programmed
3. Mode S (levels 1, 2, and 3 capable).

7. RT-1836(C) INSTALLED IN THE AIRCRAFT
CH-47 Chinook
LOCATION

8. AN/APX-118 COMMON DIGITAL TRANSPONDER REMOTE CONTROL UNIT (RCU)5
3/A 4 1 2 C S
M4/M5
REPLY
RAD
TEST
CAUTION
MIC
IDENT
FAULT
M3A
The front panel of the RCU contains pushbuttons, rocker and rotary switches, a backlit control/data entry keypad, and a fault switch/indicator.

9. REMOTE CONTROL UNIT (RCU)
Top Display Window
Rocker switch
FAULT
Bottom Display Window
Master Rotary Knob
Mode 4 Rotary Knob
Keypad

10. ARROW KEYS
Up and Down
Left and Right
Provides access to
change data and
entry to the different
Tiers and Sub-Menu’s

11. To apply power
place the MASTER rotary knob from the OFF position to the STBY position.

12. It WILL screw-up the PUBIT and you WILL get a FAILURE Code!!!
NO LINK
When the transponder is turned on it goes into a POWER UP BUILT IN TEST (PUBIT) for approximately 30 seconds.
DO NOT PRESS BUTTONS, TURN KNOBS, or in any other way FONDLE RCU;
It WILL screw-up the PUBIT and you WILL get a FAILURE Code!!!

13. When the RCU is first turned on (STBY) a NO LINK message will appear on the upper display window of the RCU.
NO LINK
NO LINK indicates a lack of communication between the transponder and the RCU.

14. NO LINK
The NO LINK message will extinguish once the PUBIT is completed and the communication link has been established between the transponder and the RCU.
If the communication link between the transponder and the RCU has not been established within 30 seconds, a transponder fault will be displayed.

15. Once the NO LINK message has extinguished –5
3/A 4 1 2 C S
M4/M5
REPLY
RAD
TEST
CAUTION
MIC
IDENT
FAULT
M3/A
Once the NO LINK message has extinguished –
the UPPER Display window on the RCU should default to the Home Menu (M3/A ) if no faults have been detected.
If FAULTS were detected…

16. The FAULT is still present!!
INDICATOR
FAULT Indicator:
Illuminates to indicate a system fault
FAULT
When the FAULT button is pressed the indication extinguishes.
Although the operator has acknowledged the Fault…
The FAULT is still present!!

17. FAULTS Some of the FAULTS that may be noted are: XP NOGO RCU NOGO
CRYPTO NOGO
TCAS NOGO
ALT NOGO
ADLP NOGO
UPANT NOGO
LOANT NOGO
BATTERY NOGO
TOD NOGO

18. UNACCEPTABLE FAULTS Unacceptable Faults for Training are:
XP NOGO (Transponder Inop)
RCU NOGO (Control Head Inop)
ALT NOGO (Mode C Inop)
UPANT AND LOANT NOGO
(Both Antennas Inop)
Refer to Quick Reference Sheet!

19. 5
3/A 4 1 2 C S
M4/M5
REPLY
RAD
TEST
CAUTION
MIC
IDENT
CRYPTO NOGO
FAULT
If a FAULT was detected during Power Up Bit (PUBIT), the operator must acknowledge the fault by selecting the FAULT button on the RCU.
A Periodic BIT (PBIT) sequence begins following the completion of PUBIT.
This Test will run every 5 minutes continuously monitoring the systems performance as well as operation.

20. and then select the ENT key on the keypad.
The fault will be cleared from the upper display window, however the fault will still exists in the BIT Status sub-menu.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
(This particular fault indicates no Mode 4 codes loaded. When this occurs, the M4/M5 CAUTION will stay illuminated in the lower display window for as long as Mode 4 is still active)
To turn Mode 4 off, the operator must select the M4 key;
and then select the ENT key on the keypad.

21. When the Mode 4 light in the lower display window has extinguished, this indicates that Mode 4 is now inactive.
NOTE: It is recommended that Mode 4 be properly loaded prior to power up and it should never be turned off prior to or in flight.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

22. Example: Select the M1 Key on the keypad to activate Mode 1.
To enable SIF modes 1, 2, 3/A, C and Mode S, select the modes using the RCU Keypad. The mode will be illuminated in the lower display window indicating it is active.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
Example: Select the M1 Key on the keypad to activate Mode 1.

23. Example: Select the M2 Key on the keypad to activate Mode 2.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC
Mode 1 is now active. 1 2
3/A 4 5 C S
Example: Select the M2 Key on the keypad to activate Mode 2.

24. Modes 1 and 2 are now active.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
Modes 1 and 2 are now active.
Example: Select the M3/A Key on the keypad to activate Mode 3/A.
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

25. Modes 1, 2 and 3/A are now active.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
Modes 1, 2 and 3/A are now active.
Example: Select the MC Key on the keypad to activate Mode C.
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

26. Modes 1, 2, 3/A and Mode C are now active.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
Modes 1, 2, 3/A and Mode C are now active.
Example: Select the MS Key on the keypad to activate Mode S.
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

27. Modes 1, 2, 3/A, C and Mode S are now active.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC
Modes 1, 2, 3/A, C and Mode S are now active. 1 2
3/A 4 5 C S

28. Elementary Surveillance
European Control of Mode S
Elementary Surveillance
31 March 2003 to 31 March 2007
Unique ICAO 24-bit aircraft address
Automatic reporting of aircraft identification
(flight plan call sign)
Flight status (airborne / on the ground)
Pressure altitude reporting in 100ft increments

29. Mode “S” Digital Read-out
MODE “S” OVERVIEW
IFF Code
Mode “S”
Digital Read-out MS
Air
ALT 200ft

30. Select the left or right arrow key to enter the field to edit M3 Code.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
Select the left or right arrow key to enter the field to edit M3 Code.

31. Enter the number 1 on the keypad. M3/A 0000
M3/A Code:
Using the Keypad, enter the Mode 3/A code A flashing character will indicate the operator is in the edit mode and this will be the current digit being entered.
NOTE: Once in the edit mode, the operator has 10 seconds to enter the correct digit.
Enter the number 1 on the keypad.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

32. Enter the number 2 on the keypad.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC
M3/A Code:
A flashing character will indicate the operator is in the edit mode and this will be the current digit being entered.
Enter the number 2 on the keypad. 1 2
3/A 4 5 C S

33. Enter the number 0 on the keypad.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC
M3/A Code:
A flashing character will indicate the operator is in the edit mode and this will be the current digit being entered.
Enter the number 0 on the keypad. 1 2
3/A 4 5 C S

34. Enter the number 0 on the keypad.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC
M3/A Code:
A flashing character will indicate the operator is in the edit mode and this will be the current digit being entered.
Enter the number 0 on the keypad. 1 2
3/A 4 5 C S

35. Select the ENTer key on the keypad to save the changes.
M3/A Code:
A flashing character will indicate the operator is in the edit mode and this will be the current digit being entered.
Select the ENTer key on the keypad to save the changes.
M3/A
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

36. Ensure 3/A and C are displayed!!!
Warning!!
Ensure 3/A and C are displayed!!!
M3/A
M3/A Code:
Mode 3/A code 1200 has now been updated and the change has been saved.
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

37. ENT Key
ENT Key
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC
The “ENT” key saves any changes that are made to the menu options when in the Normal operating state. 1 2
3/A 4 5 C S

38. If you were to select the UP or DOWN Arrow Key you would begin to scroll through the first Tier of the different Menus.

39. “OPERATE (DEFAULT) MENU”5
IDENT
M4/M5
REPLY
RAD
TEST
CAUTION
M/C
3/A 4 C S 1 2
Operate (DEFAULT) Menu
Display Examples
M3/A (CODE)
AQC SQTR
ADS SQTR
M5L2 SQTR
TCRNG
CAUTION
PRE-SET
M3/A
AQCSQTR ON
ADSSQTR ON *
M5L2SQTR OFF
TCRNG
CAUTION NONE
PRE-SET
Note: = Submenu
NOTE: * Represents future integration items

40. Mode S Acquisition Squitter Enable:
This menu item is displayed as either on or off. To change the status of the AQCSQTR, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the on and off selections using any one of the four arrow keys. Press the ENT key to save the changes.
AQCSQTR ON
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
What’s a Squitter?
Squitter: Random firing, intentional or otherwise, of a transponder transmitter in the absence of interrogation.
In layman's terms, an rf burst from the antenna at one second intervals allowing mode S information to be acquired.

41. CAUTION MODE 4 or 5: CAUTION NONE
The CAUTION menu item currently represents a Mode 4 Caution. If Mode 4 codes are not loaded, this menu item will display CAUTION 4.
CAUTION NONE
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

42. Select the Left or Right arrow key to access the next menu tier.
Pre-Set Menu:
This menu item allows the operator to access the second tier menu items. This function is accomplished by selecting the left or right arrow key.
Select the Left or Right arrow key to access the next menu tier.
PRE-SET
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

43. IDENTIFICATION FRIEND OR FOE OPERATE (DEFAULT) MENU PRE-SET MENU
BIT (STATUS)
CXP SRA BIT STATUS (GO/NOGO) MENU
M3/A (CODE)
AQC SQTR
ADS SQTR
M5L2SQTR
TCRNG
CAUTION
PRE-SET
M1 (CODE)
M2 (CODE)
AUDIO
RPYLIGHT
ADDR (MS ADDRESS)
ID (MS)
MISSION (M5)
TOD (MS)
LAST TOD (MS)
DATE (M5)
M5 PIN
NATL ORIG (M5)
KEYREM4 (M4)
KEYREM5 (M5)
MSADDR (OCTAL/HEX)
MS DATA
MS AIR
X PULSE
TCAS MENU
PWRDOWN
ANT
BIT STAT XP
RCU
CRYPTO
TCAS
ALT
ADLP
UPANT
LOANT
BATTERY
TOD
LGHT SRC
LGHT BAL
RCU FIT TEST
CXP SRA
RCU SRA
XPSWVER
RCUSWVER
RT ETM
XPPS (POWER SUPPLY)
XPRT (RT)
XPSBC (SINGLE BOARD COMPUTER)
XPECM5 (EMBEDDED CRYPTO M4/M5)
XPSP (SIGNAL PROCESSOR)
RCU SRA BIT STATUS
(GO/NOGO) MENU
FP (FRONT PANEL)
MC (MICROCONTROLLER)
BC (BOTTOM COVER)
TCAS MENU (NOT USED)
FLGTID
DSPLY
TCAS ADS
ALIMA (FT)
ALIMB (FT)
TCAS IALT
INTRFILE
TCASSENS
TRAFF
TCAS SHORT
TCAS LONG

44. HOME KEY
If you get lost in a Tier or Sub-menu, you can return to the default M3/A HOME PAGE by pressing the HOME button.

45. Mode 1 Code:
This menu item allows the operator to view and edit the Mode 1 code setting. To change the Mode 1 code, the operator may select the left or right arrow key. The first number will flash indicating it may be changed. To change the numeric digit, select the appropriate number on the keypad and select the right arrow key to move to the next entry field. Press the ENT key to save the changes. M
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

46. Mode 2 Code:
This menu item allows the operator to view and edit the Mode 2 code setting. To change the Mode 2 code, the operator may select the left or right arrow key. The first number will flash indicating it may be changed. To change the numeric digit, select the appropriate number on the keypad and select the right arrow key to move to the next entry field. Press the ENT key to save the changes. M
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

47. Note: When the Mode 4 Audio tone is set to the OFF selection and the
Mode 4 Audio Enable:
This menu item is displayed as either on or off. To change the status of the AUDIO, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the on and off selections using any one of the four arrow keys. Press the ENT key to save the changes.
AUDIO ON
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
Note: When the Mode 4 Audio tone is
set to the OFF selection and the
system is powered down the Mode 4
audio tone will not automatically
default back to the ON position.

48. Mode 4 Reply Light Enable:
This menu item is displayed as either on or off. To change the status of the M4/M5 Reply Light, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the on and off selections using any one of the four arrow keys. Press the ENT key to save the changes.
RPYLIGHT ON
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
Note: When the Mode 4 Reply Light is
set to the OFF selection and the
system is powered down the Mode 4
Reply Light will not automatically
default back to the ON position.

49. DO NOT MESS WITH Mode S ADDRESS
This menu item is displayed in either an octal or hex format. The Mode S address is hardwired into the aircraft wiring harness J1 connector.
The Mode S address may be changed and updated by selecting the left or right arrow keys to enter the update mode and typing in the desired address.
ADDR
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
DO NOT MESS WITH Mode S ADDRESS

50. The aircraft ID is an eight character alpha numeric display.
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

51. KEYREM 4:
Read only field, indicates the number of days from 00 to 31 since Mode 4 keys were last loaded. Currently not used.
KEYREM 4 --
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

52. Mode S Address:
This menu item is displayed as a three to five-character string and allows the operator to view the MS address in either an octal or hex format. To enter the update mode, the operator selects either the left or the right arrow key on the keypad. The field will flash indicating it may be changed. To change between a hex or octal display, select the up or down arrow key. Press the ENT key to save the change.
MS ADDR OCTAL
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

53. Mode S Data
This menu item is displayed as either on or off. To change the status of the MS DATA, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the on and off selections using any one of the four arrow keys. Press the ENT key to save the changes.
MS DATA ON
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

54. Press the ENT key to accept the value. MS AIR 0000
Mode S Max Airspeed:
This menu item is expressed in knots. Press the left or right arrow key to enter the update mode. Press the up or down arrow key to scroll through the values or press the numeric keys for the value desired. (0000 through 9999)
Press the ENT key to accept the value.
MS AIR
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

55. X Pulse:
This menu item is displayed as either on or off. To change the status of the X Pulse, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the on and off selections using any one of the four arrow keys. Press the ENT key to save the changes.
XPULSE OFF
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

56. NOTE: The TCAS option is not implemented for US Army rotary aircraft.
TCAS Menu:
This menu allows the operator to access the TCAS sub menu settings. Although the operator may access the submenus, the operator may not edit any of these settings.
NOTE: The TCAS option is not implemented for US Army rotary aircraft.
TCAS MENU
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

57. Power Down Parameter Storage Mode:
This menu item is displayed as either SAVE or INIT. To change the status of the PWRDOWN, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the Save and Init selections using any one of the four arrow keys. Press the ENT key to save the changes.
NOTE: The transponder will automatically save the current settings when powered down, except the Mode 4 codes, unless the M4 Codes knob is turned to the HOLD position prior to power down.
PWRDWN SAVE
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

58. NOTE: This selection will always default to DIV after 10 seconds.
Antenna Select:
This menu item is displayed as either UP, LO or DIV for upper, lower and diversity antenna selections. To change the status of the ANT, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the selections using any one of the four arrow keys. Press the ENT key to save the changes.
NOTE: This selection will always default to DIV after 10 seconds.
ANT DIV
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

59. BIT Status Menu:
This menu allows the operator access the BIT Status sub menu settings by using the left or right arrow key on the keypad.
These displays indicate either a GO, NOGO, OK or LOW with the exception of a few.
BIT STAT
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

60. Transponder BIT Status:
This is a status only display indicating GO or NOGO.
XP GO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

61. This is a status only display indicating GO or NOGO. RCU GO
RCU BIT Status:
This is a status only display indicating GO or NOGO.
RCU GO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

62. This is a status only display indicating GO or NOGO. CRYPTO NOGO
CRYPTO BIT Status:
This is a status only display indicating GO or NOGO.
CRYPTO NOGO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

63. This is a status only display indicating GO or NOGO. TCAS NOGO
TCAS BIT Status:
This is a status only display indicating GO or NOGO.
TCAS NOGO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

64. This is a status only display indicating GO or NOGO. ALT GO
Altimeter BIT Status:
This is a status only display indicating GO or NOGO.
ALT GO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S
NOTE: Does not test the aircraft
Altimeter system. This function only
tests the altimeter function in the RT.

65. Airborne Data Link Processor BIT Status:
This is a status only display indicating GO or NOGO.
ADLP GO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

66. Upper Antenna BIT Status:
This is a status only display indicating GO or NOGO.
UPANT GO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

67. Lower Antenna BIT Status:
This is a status only display indicating GO or NOGO.
LOANT GO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

68. Mode 4 Back-Up Battery BIT Status:
This is a status only display indicating OK or LOW.
BATTERY OK
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

69. This is a status only display indicating GO or NOGO. TOD GO
Time of Day BIT Status:
This is a status only display indicating GO or NOGO.
TOD GO
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

70. Light Service BIT Status:
This menu item is accessible to the operator. To change the status of the Light Service, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the 28V and 5V selections using any one of the four arrow keys. Press the ENT key to save the changes.
LGHT SRC V
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

71. Light Balance BIT Status:
This menu item is accessible to the operator. To change the selection of the Light Balance, the operator may select the left or right arrow key to activate the update mode. Once in the update mode, the operator may toggle between the -7 and +7 selections using any one of the four arrow keys. Press the ENT key to save the changes.
LGHT BAL
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

72. RCU Functional Interface Test:
This menu item has no corresponding data entry fields. When this selection is displayed, the operator may initiate functional interface test of all RCU front panel switches and indicators by depressing and releasing the left or right arrow key.
NOTE: The Functional Interface Test will be covered in a separate briefing.
RCU FIT TEST
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S

73. This concludes this Lesson.
?? QUESTIONS ??
This concludes this Lesson.
Questions?
M4/M5
CAUTION
M4/M5
REPLY
RAD
TEST
FAULT
IDENT
MIC 1 2
3/A 4 5 C S