1. 717th MEDICAL COMPANY AN/APR-39A (V) 1 RADAR WARNING DETECTOR

2. AN/APR-39A (V)1 ASET II INSTRUCTIONS
THIS TRAINING MODULE IS SENSITIVE BUT UNCLASSIFIED (SBU) AND WILL NOT BE RELEASED TO UNAUTHORIZED INDIVIDUALS.
ADVANCE TO THE MAIN MENU BY PRESSING THE RIGHT ARROW KEY.
SELECT A TRAINING MODULE BY PLACING THE MOUSE POINTER OVER THE ACTION BUTTON.
ONCE YOU ARE IN A MODULE, YOU MAY MOVE FORWARD AND BACKWARD BY UTILIZING THE RIGHT AND LEFT ARROW KEYS, RESPECTIVELY.
YOU ARE AT THE END OF A MODULE WHEN YOU SEE A “HOME” BUTTON IN THE UPPER RIGHT CORNER.
IF YOU DESIRE TO HEAR A SOUND BITE FOR A PARTICULAR PHASE OF THE TRAINING MODULE, HIT THE SOUND BUTTON.
DURING CHALLENGE TEST, ANSWERS ARE SELECTED BY HITTING THE BUTTON NEXT TO YOUR CHOICE. WRONG ANSWERS WILL BE APPARENT.

3. AN/APR-39A(V)1 REFERENCE TM 11-5841-294-12
SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS
PREFLIGHT
SYMBOLOGY/AUDIO CUES
DOCTRINE AND TACTICS
DENSE SIGNAL ENVIRONMENT OPERATIONS
DEGRADED SYSTEM OPERATIONS
SHUTDOWN PROCEDURES
CHALLENGE TEST

4. SYSTEM DESCRIPTION

5. AN/APR-39A(V)1 SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS
AN/APR-39A(1) MONITORS PULSE WAVE RADIO FREQUENCY (RF)
DISPLAYS A THREAT IN SYMBOLOGY IN A RELATIVE BEARING +/- 15 FROM THE AIRCRAFT, ANNOUNCE OVER ICS IN A SYNTHETIC VOICE.
THE APR-39A(V)1 IS COMPRISED OF THE FOLLOWING COMPONENTS:
DETECTING SET CONTROL PANEL
1 PWR ON/OFF SW
2 SELF-TEST BUTTON
3 MODE SW-MODE 1(FULL INFO), MODE 2(TERSE INFO)
4 AUDIO CONTROL KNOB

6. AN/APR-39A(V)1 SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS (cont.)
RADAR SIGNAL INDICATOR
BRIL CONTROL KNOB
LETHALITY RING
COMPASS ROSE

7. AN/APR-39A(V)1 SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS (cont.)
DETECTING SET CONTROL PANEL
RADAR SIGNAL INDICATOR

8. AN/APR-39A(V)1 SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS (cont.)
DIGITAL PROCESSOR
PROVIDES POWER AND SELF-TEST TO THE RECEIVERS
PROCESSES VIDEO INPUT FROM THE RECEIVERS
CONTAINS OPERATIONAL FLIGHT PROGRAM (OFP)
CONTAINS MISSION DATA SET (MDS) WHICH COULD BE CLASSIFIED SECRET

9. AN/APR-39A(V)1 SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS (cont.)
FWD/AFT RECEIVERS
PROVIDES POWER TO ANTENNA/DETECTORS (A/D)
AMPLIFIES AND TRANSMITS TWO VIDEO CHANNELS TO THE PROCESSOR
SANTA ANTENNA/DETECTORS (A/D)
CONTAINS AN E-J BAND SPIRAL
CONTAINS A HIGH BAND J-M SPIRAL
CONVERTS RF SIGNAL TO VIDEO SIGNAL TO RECEIVERS
A/Ds MUST BE INSTALLED CORRECTLY OR THREATS WILL BE MISREAD
NON-SANTA A/D COVER THE H-M BAND

10. AN/APR-39A(V)1 SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS (cont.)
BLADE ANTENNA COVERS THE C/D BAND ASSOCIATED WITH MISSILE LAUNCH. RF INPUT IS A DIRECT SIGNAL TO THE PROCESSOR.
A PAIR OF A/Ds ARE LOCATED ON THE NOSE OF THE AIRCRAFT AND A PAIR LOCATED ON THE TAIL. THIS PROVIDES 360° OF ANTENNA COVERAGE.

11. AN/APR-39A(V)1 SYSTEM DESCRIPTION/FUNCTION/LOCATION OF COMPONENTS (cont.)

12. Preflight

13. AN/APR-39A(V)1 PREFLIGHT
CHECK FOR GENERAL CONDITION AND SECURITY
PROCESSOR-CONNECTORS ARE TIGHT AND GROUNDING STRAP IS CONNECTED.
A/Ds-CRACKS, PEELING, LOOSE/MISSING HARDWARE, SMALL RADOME IS UP.
INITIALIZING THE SYSTEM
ALLOW SYSTEM 30 SECONDS FOR WARM-UP
NEVER OPERATE WITHIN 60 YARDS OF GROUND OR 6 YARDS OF AIR RADAR
PWR SW ON (APR 39 POWER UP)
ADJUST BRIL CONTROL FOR BEST DISPLAY OF ‘+’
VERIFY MODE SW IS IN MODE 1
SELF-TEST SEQUENCE (COMPLETED IN <30 SECONDS)
VOICE LONG COUNT
SOFTWARE VERSION NUMBER, OPERATIONAL FLIGHT PROGRAM (OFP) DISPLAYED
MISSION DATA SET (MDS) IS DISPLAYED
RECEIVER AND AVR-2 STATUS DISPLAY
VOICE SYSTEM STATUS MESSAGES
PLUS (+) SYMBOL DISPLAYED

14. AN/APR-39A(V)1 PREFLIGHT (cont.)
IF NO FAULTS (APR 39 OPERATIONAL)
ALL SYSTEM COMPONENTS WERE TESTED EXCEPT THE 4 A/Ds, WIRING OR THE CONNECTORS. (THE SM-736A TEST DEVICE WILL CHECK THESE ITEMS)

15. AN/APR-39A(V)1 PREFLIGHT (cont.)
FAULTS (APR 39 FAILURE)
QUADRANT FAULT WILL FLASH
C/D FAULT WILL HAVE FLASHING BOX AROUND ‘+’
IF ‘+’ IS NOT CENTERED IN SMALL CIRCLE

16. AN/APR-39A(V)1 PREFLIGHT (cont.)
SYSTEM OPERATION-UPON DETECTION OF RF
COMPARES PARAMETERS WITH DATA IN MDS
IF A MATCH IS MADE, SYMBOLOGY AND AUDIO IS GENERATED
IF A MATCH IS NOT MADE, EMITTER IS CLASSIFIED AS UNKNOWN, ASSOCIATES A PRIORITY
TRACKS 10 HIGHEST PRIORITY SIGNALS
DISPLAYS 7 HIGHEST PRIORITY SIGNALS
C/D BAND CORRELATION

17. Symbology / Audio Cues

18. AN/APR-39A(V)1 SYMBOLOGY/AUDIO CUES
SYMBOLOGY IS GENERIC TO THE APR-39A(V)1. FOR SPECIFIC INFORMATION ON A PARTICULAR THREAT SYMBOL THAT WILL BE DISPLAYED, REFERENCE YOUR KNEEBOARD MDS SHEET.
AZIMUTH PLACEMENT OF THE SYMBOL WILL BE WITHIN +/- 15° DF ACCURACY, RADIAL POSITION WILL BE BASED ON BOTH WEAPON SYSTEM LETHAL RANGE AND PROGRAMMED THREAT PRIORITY.
RADAR SEARCHING UNKNOWN
MODE MODE MODE MODE 2

19. AN/APR-39A(V)1 SYMBOLOGY/AUDIO CUES (cont)
GUN ACQUISITION GUN TRACKING
MODE MODE 2 MODE MODE 2
SPECIAL GUN ACQUISITION SPECIAL GUN TRACKING
MODE MODE MODE MODE 2

20. AN/APR-39A(V)1 SYMBOLOGY/AUDIO CUES (cont)
LONG RANGE LONG RANGE LONG RANGE
MISSILE ACQUISITION MISSILE TRACKING MISSILE LAUNCH
MODE MODE MODE MODE MODE MODE 2
MEDIUM RANGE MEDIUM RANGE MEDIUM RANGE
MISSILE ACQUISITION MISSILE TRACKING MISSILE LAUNCH
MODE MODE MODE MODE MODE MODE 2

21. AN/APR-39A(V)1 SYMBOLOGY/AUDIO CUES (cont)
SHORT RANGE SHORT RANGE SHORT RANGE
MISSILE ACQUISITION MISSILE TRACKING MISSILE LAUNCH
MODE MODE MODE MODE MODE MODE 2
FIX WING ACQUISITION FIX WING TRACKING FIX WING LAUNCH
MODE MODE MODE MODE MODE MODE 2

22. AN/APR-39A(V)1 SYMBOLOGY/AUDIO CUES
HELICOPTER HELICOPTER HELICOPTER
ACQUISITION TRACKING LAUNCH
MODE MODE MODE MODE MODE MODE 2
LASER RANGING LASER DESIGNATING LASER BEAMING
MODE MODE MODE MODE MODE MODE 2

23. Doctrine and Tactics

24. AN/APR-39A(V)1 DOCTRINE AND TACTICS
RADAR SEARCHING AND ACQUISITION INDICATIONS ARE INDICATORS FOR AIRCREW TO CHANGE FLIGHT MODES, THAT IS FROM LOW LEVEL TO CONTOUR; CONTOUR TO NOE, AND INCREASE VIGILANCE.
RADAR TRACK, LAUNCH, AND UNKNOWN REQUIRE IMMEDIATE ACTION. IF MASKING IS AVAILABLE, MASK TO BREAK LOCK. IF NO MASK, DEPLOY CHAFF and/or JAMMER AND MANEUVER AIRCRAFT TOWARD MASKING OR AWAY FROM THREAT.
ALERT OTHER AIRCRAFT OF RADAR WARNING INDICATIONS.
TACTICAL OPTIONS
MASK
CHAFF AND MANEUVER
JAM AND MANEUVER

25. AN/APR-39A(V)1 DOCTRINE AND TACTICS (cont)
IMMEDIATELY TURN THE AIRCRAFT TO PLACE THE THREAT AT THE 3or 9 O’CLOCK POSITION. BEGIN A MANEUVER OF DESCENDING TOWARDS MASKING OR THE THREAT’S MAXIMUM EFFECTIVE RANGE (MER). WITHIN 2 SECONDS OF BEGINNING THE MANEUVER, DISPENSE PROGRAM CHAFF CONTINUE TO CHAFF AND MANEUVER EVERY TIME RADAR TRACK IS ESTABLISHED OR EVERY 3-5 SECONDS UNTIL MASKED OR OUTSIDE THE THREAT’S MER.

26. AN/APR-39A(V)1 DOCTRINE AND TACTICS (cont)
IF JAMMING, MAINTAIN THE JAMMING ANTENNA TOWARD THE RADAR AND ACTIVATE THE JAMMER.
JINK THE AIRCRAFT TOWARD A MASK OR MER, DO NOT MAINTAIN A HEADING OR ALTITUDE FOR MORE THAN 3-5 SECONDS BEFORE TURNING OR CHANGING ALTITUDE AGAIN.
WHEN RADAR LOCK IS BROKEN, THE SYMBOL WILL GHOST.

27. Dense Signal Environment Operations

28. AN/APR-39A(V)1 DENSE SIGNAL ENVIRONMENT OPERATIONS
IF MODE 1 VOICE FORMAT IS A DISTRACTION, MODE 2 WILL REDUCE AUDIO CLUTTER WITHOUT AFFECTING THE NUMBER OR PRIORITY OF THE SIGNALS BEING PROCESSED.
IN A DENSE SIGNAL ENVIRONMENT, THE APR-39A(V)1 WILL OPERATE IN A DEGRADED MODE. THE RSDS WILL DISPLAY UP TO 7 THREATS ON THE INDICATOR. IF THE SYSTEM SENSES MORE THAN 7 THREATS, IT WILL DISPLAY ONLY THE 7 THREATS HAVING THE HIGHEST PRIORITY. AS SIGNAL DENSITY INCREASES, THE SYSTEM THRESHOLD IS AUTOMATICALLY ADJUSTED UPWARD.
WITH THE SYSTEM THRESHOLD RAISED, SIGNALS BELOW THE NEW THRESHOLD WILL NOT BE PROCESSED. THE PILOT MUST BE AWARE WHEN THE SYSTEM IS OPERATING IN A LESS SENSITIVE MODE.
THE SYSTEM INFORMS THE PILOT BY FLASHING THE CENTER ‘+’ AND THE SYNTHETIC VOICE STATES “THREAT DETECTION DEGRADED”.
SYSTEM SENSITIVITY WILL AUTOMATICALLY RETURN TO NORMAL WHEN THE SIGNAL DENSITY DECREASES. THE PILOT IS ALERTED TO SYSTEM STATUS WHEN THE ‘+’ STOPS FLASHING AND THE VOICE STATES “THREAT DETECTION RESTORED”.

29. Degraded System Operations

30. AN/APR-39A(V)1 DEGRADED SYSTEM OPERATIONS
C/D BAND AMPLIFIER INOPERATIVE- C/D THREATS WILL BE MISSED. THREATS THAT REQUIRE C/D BAND ACTIVITY CORRELATED WITH E-M BAND ACTIVITY WILL NOT BE PROCESSED CORRECTLY. FLASHING BOX OVER CENTER ‘+’.
E-J BAND A/D ELEMENTS INOP-THIS FAULT MAY CAUSE BEARING ERRORS FOR E-J BAND THREATS. E-J BAND THREATS IN THE AFFECTED QUADRANT WILL BE MISSED.
mmWAVE PERFORMANCE DEGRADED BY WEATHER-THREATS IN THE mmWAVE REGION MAY BE MISSED IN HEAVY RAIN CONDITIONS.
RECEIVER INOP-IF A RECEIVER OR A SINGLE VIDEO CHANNEL IS INOP, THREATS WILL BE MISSED.
NO SYNTHETIC VOICE WARNING MESSAGES WILL INCREASE YOUR WORKLOAD.

31. Shutdown Procedures

32. AN/APR-39A(V)1 SHUTDOWN PROCEDURES
TO AVOID DAMAGE TO EQUIPMENT DO NOT FORCE THE PWR SWITCH TO THE OFF POSITION. ALWAYS PULL THE PWR SWITCH HANDLE TOWARDS YOU TO DISENGAGE THE LOCK, THEN SET THE PWR SWITCH TO OFF.

33. Challenge Test

34. AN/APR-39A(V)1 CHALLENGE TEST
1. THE AN/APR-39A(V)1 RADAR SIGNAL DETECTING SET MONITORS THE ____________ RADIO FREQUENCY FOR POTENTIAL THREATS.
A. CONSTANT WAVE
B. PULSE WAVE
C. CONSTANT DOPPLER WAVE
2. A POTENTIAL THREAT IS DISPLAYED ON THE APR-39A(V)1 INDICATOR IN
A. RELATIVE BEARING FROM THE AIRCRAFT.
B. LONGITUDE AND LATITUDE.
C. MAGNETIC BEARING.
D. RELATIVE BEARING FROM THE POTENTIAL THREAT.
3. WHAT THREAT SIGNALS DISPLAYED ON THE INDICATOR REQUIRE IMMEDIATE ACTION?
A. ACQUISITION,TRACK,LAUNCH
B. ACQUISITION,TRACK,UNKNOWN
C. ACQUISITION,TRACK,SEARCH
D. TRACK,LAUNCH,UNKNOWN

35. AN/APR-39A(V)1 CHALLENGE TEST
4. THE DETECTING SET CONTROL PANEL CONTAINS THE FOLLOWING CONTROLS:
A. PWR/ON/OFF SWITCH, TEST BUTTON, MODE SWITCH, BRIL KNOB
B. PWR/ON/OFF SWITCH, TEST BUTTON, BRIL KNOB, AUDIO CONTROL
C. PWR/ON/OFF SWITCH, TEST BUTTON, MODE SWITCH, AUDIO CONTROL
D. PWR/ON/OFF SWITCH, AUDIO CONTROL, MODE SWITCH, BRIL KNOB
5. SELECT THE FUNCTION PERFORMED BY THE DIGITAL PROCESSOR.
A. PROVIDES POWER AND SELF-TEST TO THE RECEIVERS.
B. PROVIDES POWER AND SELF-TEST TO THE ANTENNA/DETECTORS.
C. PROCESSES SIGNALS DIRECTLY FROM THE ANTENNA/DETECTORS.
D. PROVIDES SELF-TEST SIGNAL TO USER DATA MODULE(UDM).
6. WHICH STATEMENT BEST DESCRIBES THE RECEIVERS FOR THE APR-39A(V)1.
A. THERE ARE TWO RECEIVERS (FWD AND AFT). EACH AMPLIFIES AND TRANSMITS TWO VIDEO CHANNELS TO THE PROCESSOR.
B. THERE ARE TWO RECEIVERS (RIGHT AND LEFT). EACH AMPLIFIES AND TRANSMITS ONE VIDEO CHANNELS TO THE PROCESSOR.
C. THERE ARE TWO RECEIVERS (FWD AND AFT). EACH AMPLIFIES AND TRANSMITS ONE VIDEO CHANNELS TO THE PROCESSOR.
D. THERE ARE TWO RECEIVERS (RIGHT AND LEFT). EACH AMPLIFIES AND TRANSMITS TWO VIDEO CHANNELS TO THE PROCESSOR.

36. AN/APR-39A(V)1 CHALLENGE TEST
7. THE SANTA ANTENNA/DETECTORS DETECT PULSE WAVE RADAR IN THE
A. A-H BAND.
B. E-M BAND.
C. C-J BAND.
D. K-L BAND.
8. THE BLADE ANTENNA PROVIDES OMNIDIRECTIONAL COVERAGE IN THE
A. J BAND
B. H-M BAND
C. E-F BAND
D. C-D BAND
9. THE APR-39A(V)1 IS WARMED UP
A. WHEN THE ‘+’ SYMBOL APPEARS IN THE CENTER OF THE RSDA INDICATOR.
B. IN APPROXIMATELY 1 MINUTE.
C. IN APPROXIMATELY 30 SECONDS.
D. WHEN THE DIAMOND SYMBOL APPEARS IN THE CENTER OF THE RSDS INDICATOR.

37. AN/APR-39A(V)1 CHALLENGE TEST
10. WHEN PERFORMING THE PRE-FLIGHT, WHAT ARE THE MINIMUM SEPARATION DISTANCES REQUIRED BETWEEN THE APR-39A(V)1 AND A GROUND BASED RADAR AND A AIRBORNE RADAR?
A. 30 YARDS, 3 YARDS
B. 40 YARDS, 4 YARDS
C. 60 YARDS, 6 YARDS
D. 70 YARDS, 7 YARDS
11. YOU HAVE SET THE PWR SWITCH TO ON AND THE SYNTHETIC VOICE MESSAGE “APR 39 POWER UP” HAS BEEN RECEIVED. WHICH STEP DO YOU PERFORM NEXT?
A. PRESS THE TEST BUTTON TO BEGIN THE SELF-TEST
B. ADJUST THE BRILLIANCE OF THE INDICATOR USING THE BRIL KNOB
C. ADJUST THE AUDIO USING THE AUDIO KNOB
D. CHECK THE MODE SWITCH IS IN THE 1 POSITION

38. AN/APR-39A(V)1 CHALLENGE TEST
12. THIS DISPLAY APPEARED DURING THE SELF-TEST. THE FLASHING SQUARE INDICATES
A. A FAULTY FORWARD LEFT LASER QUADRANT
B. A SINGLE CHANNEL FAULT IN THE FORWARD RECEIVER
C. A FAULTY AFT RECEIVER
D. A C/D BAND FAULT
13. WHICH SYSTEM COMPONENT (S) ARE NOT TESTED DURING THE SELF-TEST?
A. FORWARD RECEIVER
B. AFT RECEIVER
C. ANTENNA/DETECTORS
D. USER DATA MODULE

39. AN/APR-39A(V)1 CHALLENGE TEST
14. THIS SYMBOL REPRESENTS
A. A SHORT RANGE SAM AT 2 O’CLOCK, ACQUISITION
B. A LONG RANGE SAM AT 2 O’CLOCK, ACQUISITION
C. A SHORT RANGE SAM AT 2 O’CLOCK, TRACKING
D. A LONG RANGE SAM AT 2 O’CLOCK, TRACKING
15. THIS SYMBOL REPRESENTS
A. RADAR SEARCHING
B. LASER BEAMING
C. LASER RANGING
D. RADAR TRACKING

40. AN/APR-39A(V)1 CHALLENGE TEST
16. THE SYMBOL AS SEEN IN THE DIAGRAM REPRESENTS
A. A SHORT RANGE MISSILE AT 2 O’CLOCK, TRACKING
B. A LONG RANGE MISSILE AT 2 O’CLOCK, TRACKING
C. A SHORT RANGE MISSILE AT 2 O’CLOCK, LAUNCHING
D. A LONG RANGE MISSILE AT 2 O’CLOCK, LAUNCHING
17. WHICH IS THE CORRECT MODE 2 SYNTHETIC VOICE SYNTAX?
A. ZOO ZOO 23 5 O’CLOCK TRACKING
B. GUN GUN 5 O’CLOCK ACQUISITION
C. ZOO ZOO 23 5 O’CLOCK ACQUISITION
D. GUN 5 O’CLOCK
18. WHEN OPERATING IN A DENSE SIGNAL ENVIRONMENT THE SYSTEM AUTOMATICALLY RAISES THE SIGNAL PRIORITY THRESHOLD. HOW IS THE PILOT MADE AWARE OF THIS SITUATION?
A. A DIAMOND SYMBOL FLASHES IN THE CENTER OF THE LETHALITY RING AND A SYNTHETIC VOICE MESSAGE STATES THE “THREAT DETECTION DEGRADED”.
B. A SQUARE SYMBOL FLASHES IN THE CENTER OF THE LETHALITY RING AND A SYNTHETIC VOICE MESSAGE STATES THE “THREAT DETECTION DEGRADED”.
C. A PLUS SYMBOL FLASHES IN THE CENTER OF THE LETHALITY RING AND A SYNTHETIC VOICE MESSAGE STATES THE “THREAT DETECTION DEGRADED”.
D. AN ASTERISK SYMBOL FLASHES IN THE CENTER OF THE LETHALITY RING AND A SYNTHETIC VOICE MESSAGE STATES THE “THREAT DETECTION DEGRADED”.

41. AN/APR-39A(V)1 CHALLENGE TEST
HIT TO
END
AN/APR-39A(V)1 CHALLENGE TEST
19. YOU HAVE BEGUN THE MANEUVER FOR DISPENSING CHAFF BY PLACING THE THREAT AT YOUR 3 O’CLOCK POSITION. YOU MUST BEGIN DISPENSING CHAFF WITHIN ________SECONDS OF THIS MANEUVER.
A. 5
B. 4
C. 3
D. 2
20. TO AVOID DAMAGE TO THE PWR ON/OFF SWITCH DURING SHUTDOWN PROCEDURES.
A. PRESS THE PWR ON/OFF SWITCH AND MOVE TO THE OFF POSITION
B. PRESS AND PULL THE PWR ON/OFF SWITCH TO THE OFF POSITION
C. PULL THE PWR ON/OFF SWITCH AND MOVE TO THE OFF POSITION

42. YOU HAVE COMPLETED THE AN/APR-39A (V)1 MODULE NOW GO OUT AND KICK THIS BOY’S BUTT