Defensive Systems (unclassed) Flashcards
AN/AAR-47 Missile Warning System detects what??
The MWS detects the rocket plume of a launched missile and automatically provides the CAWS alert “MISSILE LAUNCH” and visual directional indications.
Where will you see the indicarion of a missile threat?
1-1679. LHUD Visual indications are on the MWS Control Indicator.
1-1680. RHUD Visual indications are on the MWS Control Indicator and the HUD’s MWS threat indications (Figure 1-182).
NOTE: Visual indications last only while the MWS detects a threat and may extinguish before “MISSILE LAUNCH” terminates. If enabled, the MWS will signal the CMDS to automatically dispense countermeasures.
MWS Laser Detection explained
The MWS also detects when the aircraft is targeted by lasers of specific characteristics. Laser detection provides “MISSILE LAUNCH” alerts and visual directional threat indications. Laser detections may be of such short duration that the visual indication expires before the
display can be confirmed.
Regarding the missile defense system, what is an OSC, where are they located and what do they do?
Four OSCs (optical sensor converters) are installed on the aircraft (Figure 1-211).
Two are mounted forward in the lower nose section (one left and one right) at FS 126 and two are mounted in the tail section (one left and one right) at FS 1880.
The OSCs send electronic signals to the CP (computer processor) where they are examined to determine if they represent a threat.
AN/ALE-47 Countermeasures
Dispensing System (CMDS)
The Countermeasures Dispensing System provides an integrated, reprogrammable, computer controlled capability for dispensing expendables.
The system is capable of programmed automatic response to incoming threats in conjunction with the MWS and IRCM, or manual dispensing.
The CMDS consists of 12 dispensers for chaff and flares, 3 safety switches, 6 sequencers (one for every two dispensers), a MANUAL DISPENSE pushbutton, a DISPENSE ARM switchlight, 1 Control Display Unit (CDU), and 1 programmer.
Why we fly with the switch slaved to MWS instead of IRCM?
When operating in MAN, SEMI, or AUTO Modes and with the PRGM switch in the 2, 3, or 4 position, software dispense inhibits within the MDF will, under specified conditions,
prevent dispensing of expendables. If the Mission Bus connection is lost, the system will continue to operate as a stand-alone system with increased possibility of false alarms and unnecessary deployment of expendables.
Flare dispensers quantity and location
Twelve dispensers are mounted on the aircraft.
Six are mounted on the fuselage bottom, aft of the crew entrance door, (left and right) FS’s 405, 420, and 431. Three additional dispensers are located on each forward main landing gear pod, (left and right) at FS 790.
Composite covers are available to cover the dispensers when magazines are not installed. They cannot be installed when magazines are loaded.
What do the safety switch pins do?
The safety switches allow for a power interrupt when a safety pin is inserted in the
switch. Each switch is connected to two sequencers.
Dispense Arm Switchlight does what?
This cover guarded switchlight provides electrical power to the sequencers when the three safety pins have been pulled.
Infrared Countermeasures System (IRCM) purpose
The AN/AAQ-24(V)12 Infrared Countermeasures (IRCM) System is a high power directional Infrared (IR) jammer.
The system provides threat acquisition, tracking, and jamming of missiles from ejection through postburnout or until threats can no longer be detected.
The system can also interface with the CMDS to dispense flares.
IRCM Turrets operation explanation
Explanation: When a possible missile threat is detected by the UV sensors, the processor analyzes the sensor data. If the data fits a threat profile, the processor commands the turret(
s) to slew to the threat’s position and engage the laser. The turret coarse-points the FTS and laser beam towards the threat. The FTS tracks the threat’s IR radiation throughout
engagement and provides digitized video to the processor.
Aircrew eyeball damage from a single aft or forward IRCM turret
The laser is invisible. It can injure eyes or skin within 187 feet for a single aft turret or 200
feet if the two forward turrets are installed .
The eye hazard distance is significantly increased through binoculars, telescopes, telephoto lenses, etc.
The laser can ignite paper, plastics, and dried foliage within 20 feet. Although the laser does
not ignite fuel or hydraulic fluid within 20 feet, these liquids may ignite from burning paper,
etc. within this zone.
IRCM LASER TRANSMITTER ASSEMBLY TURRETS
Three (or one) Laser Transmitter Assembly turrets on the exterior fuselage provide(s) the electrical and mechanical means necessary to defeat a missile (Figure 1-211).
The steerable turret(s) contain a transmitter controller, a laser, and a Fine Track Sensor (FTS). When the turret is stowed, it is faired to the aircraft’s slipstream, with the lens pointed inward for protection.
Drag Index for IRCM turrets?
No turret: 0 additional drag index points
1 turret: 3 additional drag index points
3 turrets: 6 additional drag index points
NOTE: MWS + CMDS = 1 additional drag index point
