ASE employment and threat systems

Question 1

ASE

Answer 1

Aircraft Survivability Equipment

Question 2

ASE Description

Answer 2

Aircraft Survivability Equipment (ASE) control and display is accomplished through CAAS.

ASE is only partially integrated with CAAS in order that basic functions are available in the event that
CAAS is inoperative.

Both manual and automatic initiation of flares is provided and manual initiation of chaff is provided.

ASE detects radar and infrared guided missiles and dispenses countermeasure decoys to increase the survivability of the aircraft and crew.

Question 3

Radar Signal Detecting Set (RSDS) (APR-39):

Answer 3

(1) Is a passive electronic warfare system that provides visual and aural indications for the presence of and bearing to active radar transmitters

(2) Detects those pulse radar signals usually associated with hostile fire control radars in the E-J and MMW (millimeter wave (K-M)) radio frequency signal bands

(3) The RSDS is the heart of the helicopter threat warning suite

Question 4

Common Missile Warning System (CMWS):

Answer 4

(1) Is a passive electronic warfare system designed to protect the helicopter against surface-to air
and air-to-air missiles

(2) The system detects in-band infrared and ultraviolet radiation emanating from a missile plume (exhaust)

Question 5

Common Missile Warning System (CMWS) Components:

Answer 5

Electronic Control Unit (ECU)
(1) Is the control unit of the CMWS
(2) Serves as one of the two interfaces between the CMWS and RSDS

5 Electro-optical Missile Sensors (EOMS)
(1) EOMS Location
(a) 2 on the left and right side of the forward pylon
(b) 2 on the left and right side of the aft pylon
(c) 1 located underneath just forward of the ramp
(2) Each EOMS covers approximately 120 degrees

Question 6

Improved Countermeasures Dispenser (ICMD) system:

Answer 6

(1) Is an Electronic Counter Measure (ECM) system designed to protect aircraft from Anti- Aircraft Artillery (AAA), Surface–to-Air Missile (SAM) and Airborne Intercept (AI) threats.

(2) Dispenses chaff or flare countermeasures against radar guided system and/or infrared
seeking missile detected threats

Question 7

There are _ externally mounted dispensers

Answer 7

(1) 4 flare dispensers: 2 mounted to each left and right sides

(2) 4 Chaff dispensers: 2 mounted to each left and right sides

(3) Flare and Chaff can be dispensed from either cyclic stick

(4) There are 4 Flare dispenser switches in the cabin two on each side

Question 8

Safety switch

Answer 8

(1) Located in the aft cabin

(2) Safety pin manually installed in the safety switch, preventing firing flares or chaff while on the ground

(3) The safety pin physically opens the circuit to the impulse cartridges

(4) Safety pin must be removed to dispense countermeasures

Question 9

ALE-47(V) sequencers

Answer 9

ALE-47(V) sequencers (4)
(1) The sequencers are located in the cabin area near its dispenser
(2) One sequencer for each pair of dispensers
(3) Provide voltage to individually fire impulse cartridges
(4) Sequencers monitor payload inventories and report to the CMWS ECU

Question 10

Additional ASE notes and characteristics:

Answer 10

● CDUs provides the primary interface for ASE control functions

● MFDs display ASE inventory, advisories and annunciation text when appropriate’
● Threat warnings are announced through the Digital ICS and shown on the APR-39 indicator

● Do not interrupt power to ASE during the first 5 minutes after power up SBIT. The ASE inventory may not be accurate until the SBIT has completed running.

Question 11

General ASE Process:

Answer 11

● Detect: Through the CMWS’s five EOMS to detect IR missile threats

● Process: ECU receives ultraviolet (UV) detection data from each EOMS and performs a confidence level evaluation. Based on the computed confidence level, the ECU may cue the JHCU and / declare a threat

● Handoff: Takes place at the cue threshold, the ECU hands off the spatial coordinates of the target of interest to a JHCU. At the declared threshold, the CMWS ECU not only hands off the coordinates to ATIRCM, but immediately launches a flares solution through the ICMD system

● Acquire and Track: The JHCU acquires and then tracks the target of interest using the IR tracker sensor in the IRJH

● Jam: The JHCU confirms a threat, a jam code is generated and sent to the MBL and the MBL transmits the jamming laser energy to the IRJH via the OC

Question 12

Reference:

Answer 12

Reference: CH-47F Aircraft Survivability Equipment Student Handout, CBAT