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1
Q

What does CUI stand for?

A

Controlled Unclassified Information

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2
Q

What is the purpose of the OT-228/U Common Infrared Counter Measure (CIRCM) for CH-47F Aircraft?

A

Employs infrared countermeasures to protect the aircraft from missile threats.

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3
Q

What are the conditions for employing OT-228/U CIRCM?

A

Given classroom instruction, hands-on demonstration, a CH-47F Aircraft with CIRCM installed, operational Missile Warning System (MWS), and applicable tools.

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4
Q

What does SOP stand for in the context of survivability?

A

Standard Operating Procedure

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5
Q

Identify the components involved in employing the OT-228/U CIRCM.

A
  • CIRCM
  • Line Replaceable Units (LRUs)
  • Platform Components
  • Modes of Operation
  • Maintenance Procedures
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6
Q

True or False: All system operational and maintenance procedures are for instructional purposes only.

A

True

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7
Q

What must be referred to before operating and/or performing any maintenance procedures?

A

Applicable system/platform technical manuals

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8
Q

What does Advanced Threat Infrared Countermeasure (ATIRCM) refer to on the Multifunction Display (MFD)?

A

It refers to CIRCM.

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9
Q

Fill in the blank: LASER stands for _______.

A

Light Amplification by Stimulated Emission of Radiation

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10
Q

What are the types of LASERs?

A
  • Continuous Wave (CW)
  • Single-pulse
  • Multiple-pulse
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11
Q

How is LASER radiation characterized compared to ordinary light?

A
  • More directional
  • Limited to a single or a limited number of wavelengths
  • Coherent
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12
Q

What is the definition of Class 1 LASER?

A

Considered to be incapable of producing damaging radiation levels during operation.

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13
Q

What distinguishes Class 2 LASERs?

A

Emits in the visible portion of the spectrum (0.4 to 0.7 µM) and eye protection is normally afforded by the aversion response.

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14
Q

Class 4 LASERs are hazardous to which parts of the body?

A

Eye or skin from the direct beam.

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15
Q

What is the nominal hazard zone (NHZ) distance for CIRCM LASERs?

A

82 feet (25 meters) from any single LASER.

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16
Q

What is the purpose of the CIRCM system?

A

Provides near spherical coverage of the host platform by interfacing with the Missile Warning System.

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17
Q

What are the major components of the CIRCM system?

A
  • 2 LASERs
  • 2 Pointer Trackers (P/T)
  • 1 System Processor Unit (SPU)
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18
Q

What does the System Processor Unit (SPU) do?

A
  • Generates computational, control, and communications resources
  • Provides power to P/T LRUs
  • Processes incoming signals from MWS
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19
Q

What is the operational temperature range for the CIRCM system?

A

-65°F (-54°C) to +160°F (71°C)

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20
Q

What is the non-operation (long-term storage) temperature range for the CIRCM system?

A

-80°F (-62°C) to +85°F (29°C)

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21
Q

What does the CIRCM system automatically do when it detects a missile threat?

A

Tracks and actively counters IR guided missile threats with directable LASER energy.

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22
Q

What is the function of the Pointer Tracker (P/T) in the CIRCM system?

A

Directs the mid-infrared LASER beam onto the threat and disrupts the missile’s guidance system.

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23
Q

What type of energy does the CIRCM system’s LASER utilize?

A

Mid-infrared (IR) signal.

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24
Q

What is the MIL-STD standard mentioned?

A

MIL-STD-1553B

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25
What is the power input for the SPU?
+28V
26
Where is the SPU installed on the aircraft?
On the left side above the P/TL 1
27
What does the P/T LRU do?
Points and stabilizes the energy in response to azimuth and elevation messages
28
What are the components contained in the P/T?
Motors, motor drivers, camera, cryogenic cooler, electronics hardware, operational applications software, optical components, interfaces
29
What is the output of the P/T?
The IR beam exits through the P/T output dome
30
What is the weight of P/T 1?
24.7 lbs
31
Where is P/T 1 installed on the aircraft?
On the left side attached to Laser 1 under the SPU
32
What is the function of the LASER LRU?
Contains electronic components and optical elements to modulate mid-infrared LASER energy
33
What does the ASE Panel control?
CIRCM ON and OFF state
34
What does the Proximity Switch do?
Disarms CIRCM from firing the LASER when the aircraft lands
35
What must be checked before operating CIRCM?
Refer to platform/system specific technical manuals and checklist
36
What are the operational modes of the CIRCM?
* OPERATE * BIT
37
What is the nominal hazard zone (NHZ) for CIRCM LASERs?
82 feet (25 meters) from any single LASER, 118 feet (36 meters) where two LASERs are visible
38
What does BIT mode determine?
Health of the CIRCM system
39
What is the Power-up BIT (PBIT)?
Executes automatically at system power on to establish LRU operational status
40
What is the purpose of Continuous BIT (CBIT)?
Performs periodic tests evaluating operational status in a non-interference basis
41
How can an Initiated BIT (IBIT) be requested?
Manually by the aircrew to verify operational status of CIRCM
42
What safety precautions are advised when operating LASERs?
* Avoid eye or skin exposure * Use approved LASER protective eyewear * Wear long-sleeved clothing
43
What is the default state of CIRCM when power is applied to the aircraft?
OFF
44
What does the Safe/Arm switch do?
Enables or disables the CIRCM system LASER
45
What happens if CIRCM is not powered on concurrently with the MWS?
CAAS will display a CIRCM system failure
46
What is required for CIRCM LASER response to threat stimulus?
* CIRCM system is powered ON * Weight-Off-Wheels is indicated * CIRCM Safe/Arm switch is in ARM position
47
What should be established during the Confidence Test?
Constant communication between the cockpit and ground personnel
48
What does the CIRCM utilize?
A Class IV LASER
49
What should aircrews do before flight regarding flares in chaff module positions?
Visually inspect the dispensers for proper loading ## Footnote Ensures correct identification in ASE equipped aircraft.
50
What is the consequence of loading flares into chaff dispensers?
Flares will not be correctly detected and could damage rotor blades ## Footnote Flares could be dispensed unintentionally.
51
What happens if CIRCM is not powered-on within 30 seconds after CMWS is powered-on?
CIRCM will not complete startup built-in test (SBIT) ## Footnote This leads to an ATIRCM system failure indication.
52
What does the threat system status display provide to the pilot?
Visibility into the threat detection system operational state ## Footnote Includes failed, degraded, or normal status indicators.
53
What does the threat detector fault arcs indicate?
Visibility on the compass rose to areas where threat detection coverage is degraded ## Footnote Due to failure of threat detectors.
54
What type of notification does the crew receive if the entire CIRCM system fails in flight?
Aural notification for 'Jamming Countermeasure Failed' ## Footnote Indicates a complete system failure.
55
What are the potential causes of CIRCM system failures?
SPU failure and conditions making both left and right Pointer/Tracker (PT) and/or Lasers inoperable ## Footnote Example: Left laser fail and Right PT fail.
56
What information is available on the Navigation Display page regarding CIRCM status?
Additional CIRCM status information ## Footnote Similar to CMWS.
57
What is the recommended action when using isopropyl alcohol?
Avoid contact with eyes, skin, and clothing; use with adequate ventilation ## Footnote Direct eye contact can cause irritation.
58
What should be done if damage is detected during optics cleaning?
The LRU exhibiting the condition shall be replaced ## Footnote Includes scratches, digs, chips, fractures, or cracks.
59
What is required for ESD precautions while handling Electrostatic Sensitive assemblies?
Perform ESD precautions ## Footnote Necessary for maintenance personnel.
60
What is the first step in the Pre-Maintenance procedure for CIRCM?
Set SAFE/ARM switch to SAFE ## Footnote Ensures safety before maintenance actions.
61
What is the procedure for removing the Laser Pointer Tracker (LP/T)?
Disconnect electrical connectors, loosen captive screws, and carefully remove LP/T ## Footnote Follow specific steps to avoid damage.
62
What is the allowable action for a damaged P/T connector receptacle?
Replace P/T ## Footnote No repairs allowed.
63
What should be done if corrosion is found on the Pointer/Tracker?
Repair if light; replace if severe ## Footnote Follow TM 1-1500-344-23 for cleaning and corrosion control.
64
What should be inspected before installing the LP/T?
Chemical coated surfaces ## Footnote Ensures proper maintenance procedures.
65
What is the final step in the LP/T installation procedure?
Secure Access Panel with two bottom latches ## Footnote Completes the installation process.
66
What is the first step in securing LP/T1 to the Bracket Assembly?
Position LP/T1 onto Bracket Assembly.
67
How is LP/T1 secured to the Bracket Assembly?
Using four captive screws.
68
What must be performed after securing LP/T1?
Perform resistance check.
69
What is the first action when removing LP/T2?
Open Access Panel by disconnecting two bottom latches.
70
What should be used to clean the area around mounting surfaces?
Cheesecloth dampened with isopropyl alcohol.
71
What is the warning associated with the LASER and P/T components?
They contain Chromium, Nickel, or Cadmium plating.
72
What should you do if dust contacts your eyes during maintenance?
Flush them thoroughly with water.
73
What is the allowable action for a damaged P/T connector receptacle?
Replace P/T.
74
What must be done if there are cracks on the P/T dome?
Replace P/T.
75
What is the action for light corrosion found on P/T?
Repair IAW TM 1-1500-344-23, Cleaning and Corrosion Control.
76
Fill in the blank: The acronym 'SPU' stands for _______.
System Processor Unit.
77
What must be done if a damaged optical input port is found?
Replace P/T.
78
What is the action required for loose or missing hardware on LASER?
Replace LASER.
79
What is the procedure to secure SPU to the Mounting Plate?
Using four captive screws.
80
What is required to be worn when using a power grinding wheel?
Approved respirator and goggles or face shield.
81
What does the acronym 'TM' stand for in maintenance procedures?
Technical Manual.
82
What is the allowable action if severe corrosion is found on SPU?
Replace SPU.
83
What should be done if coughing or wheezing persists after dust inhalation?
Get immediate medical attention.
84
What is the first step to install LP/T2?
Position LP/T2 onto Bracket Assembly.
85
How should the Access Panel be secured after maintenance?
With two bottom latches.
86
What is the action for a damaged mounting bolt on LASER?
Replace LASER.
87
What is the purpose of torqueing captive screws?
To ensure secure attachment IAW applicable TM.
88
What must be done before sanding or grinding LASER components?
Refer to TM 1-1500-344-23.
89
What does 'IAW' stand for?
In Accordance With.

CH-47F (13 decks)

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