IHADSS

Question 1

What is HMS and what does it provide?

Answer 1

Helmet Mounted Sight.

Provides continuous LOS information for:
- Sensor pointing
- Weapons aiming

Question 2

What are the HMS Subsystems?

Answer 2

• AAIH
  -IBRU
  -SPS
  -MTU
  -ISDU

Question 3

AAIH

Answer 3

Apache Aviator Integrated Helmet

Primary purpose is to establish electronic LOS relative to the Armament Datum Line (ADL).

-Once established, continuous head position is provided to MP.
-Provides audio headset for comms, not part of IHADSS, head protection, sensor pointing, weapons aiming, and comms.
- HDU provides NVS imagery for night flight.

Question 4

ISDU

Answer 4

Integrated Sight Display Unit

Main electronics controller for HMD/HMS
Primary interface for the IHADSS to/from aircraft and primary power interface from the aircraft

Stores mapping data (MCD) both stations, mounted in EFAB, shared by both crew members. IBRU boresight data stored in ISDU, verified by MP on every power up.

Question 5

IBRU

Answer 5

Improvised Boresight Reticle Unit

Electro-optical device that provides a reference for the crewmember to align the IHADSS to Armament Datum Line (ADL)
Surveyed into position and rigidly mounted on top of the center section of the crewmember instrument panel

Question 6

SDC

Answer 6

Signal Data Converter

Converts the “H Field” signal to a digital signal and sends it to the ISDU

Question 7

IBRU provides the aircrew a ______ acquisition window measuring at ____ in diameter at ____ from the face of the IBRU and at least ____ in diameter at ___ from thee face of the IBRU.

Answer 7

5 degree
1.5 inches
20 inches
3 inches
40 inches

Question 8

What will the color of the three concentric circles and “cross hairs” to the naked eye will be?

Answer 8

Yellow white, and through the HDU combiner lens will be reddish orange.

Question 9

When IHADSS button is selected, what selectins are availabe with boresight correctors?

Answer 9

BRU Crew station button L1
BRU Button R1
Data entry fields R4-R6
Status window created to confirm select
Input limits
Last Rev Date

Question 10

What knob adjust IBRU brightness?

Answer 10

PRI INT LT knob

Question 11

What is HMD and what does it provide?

Answer 11

Helmet Mounted Display.

• Provides display of symbology and sensor imagery in front of crew member
• Electro-optical link to selected sensor (M-PNVS/M-TADS)

Question 12

What are the subsytems of HMD?

Answer 12

• ISDU
  -DDU
• HDU

Question 13

-Where are the IHADSS components located primarily?
-Are they required for crewmember interaction?

Answer 13

-Components are primarily located in the crew stations and the Extended Forward Avionics Bays (EFABS).
- No, but are an integral part of the system.

Question 14

What are Mission Processors and what do they provide?

Answer 14

-MPs are the bus controllers for the weapons and sight subsystems.

-They provide symbol generation for the appropriate symbology with crewmembers HDU.

(Each crew member retains individual control of brightness/contrast)

Question 15

Spindle or cylinder on which a wire is wound

Answer 15

Bobbin.
Typically found in electronic equipment for applications such as coil.

Coil of wire carrying a current has important magnetic properties.

Question 16

IMRU

Answer 16

Improved Magnetic Receiver Unit.

AAIH uses an IMRU with bobbins to detect helmet position.
Bobbins on left of AAIH, electronics on the right.

Question 17

MTU

Answer 17

Magnetic Transmitter Unit.

Provides; Maximum coverage for head position, transmits three different dimensional axis (X,Y, and Z), both E (RF) and H (magnetic) field.
Only one axis transmitting for both crew stations at a time. EM fields flood the crew station.

Question 18

Electronics Module

Answer 18

Stores part number, serial number, and operational time

Question 19

Where are the MTU’s mounted in each crew station?

Answer 19

Over their left shoulder.

Mounts should not be removed. No provisions for realigning at the unit level.

Question 20

Motion Box

Answer 20

Theoretical rectangular box that represents the available range of motion at which the IMRU detects RF and EM fields transmitted by the MTU

Question 21

What message will you get if the IMRU can detect the EM signals transmitted by the MTU

Answer 21

IHADSS LOS Invalid message being displayed on the crew members High Action Display (HAD)

Question 22

Displayed when AIH is sensed near or at the limit of the motion box

Answer 22

Motion Box Message

-Selected sensor still driven

Question 23

IHADSS requires boresighting?

Answer 23

IHADSS Boresight required

Question 24

SPS

Answer 24

Sea Position Sensor

Indentifies the seat height position within the mapped crew station
Has two Magnetic Correction Data (MCD)’s for each; Lower and Upper Seat position
ISDU decides which MCD to use based on SPS feedback

Question 25

What happens once the IHADSS is bore sighted and the crew member changes the seat such that the ISDU changes MCD's?

Answer 25

That station LOS will go invalid for about one second while the ISDU is changing MCDs. The pilot should re-boresight IHADSS.

Question 26

What does the HMS establish the crew member LOS in reference to?

Answer 26

The helicopter ADL to align the helicopter mounted weapons and sensors to controlled positions. Each crew member LOS is provided to MP for sensor pointing, symbol generation, ranging, and/or weapons aiming.

Question 27

IHDU

Answer 27

Improved Helmet Display Unit Electro optical (monocular) device which displays video and symbology input from DDU on combiner lens in front of crew members right eye. Contains 0.75 inch CRT and magnifying optics which are designed to display an image so crew receives a 30 degree by 40 degree field of view (FOV)

Question 28

What is the video processor for the HDU

Answer 28

DDU Display Driver Unit

Question 29

Mounted on an adjustable stem to provide custom adjustment for each crewmember

Answer 29

Combiner Lens Projected permitting simultaneous viewing of video and outside world

Question 30

Two main adjustments

Answer 30

Image level and focus Infinity Focus Collar Image Rotation Collar

Question 31

IHADSS TEMP ORIDE option bypasses the ___

Answer 31

100 degree C automatic shutdown protection Crew notification at caution at 92 degree C +/- 3 displayed in caution area

Question 32

IHADSS consist of what two subsystems

Answer 32

HMD and HMS

Question 33

What sighting component does the AAIH interface with for LOS Calculation?

Answer 33

ISDU

Question 34

What components make up the HMD

Answer 34

HDU, DDU, ISDU

Question 35

Which component creates the symbology viewed by the crew member?

Answer 35

MP

Question 36

What will routing the IHADSS HDU cable under the right arm cause

Answer 36

Entanglement during emergency egress

Question 37

where is IHDU stowed

Answer 37

IHDU storage on right console

Question 38

What doe IHDU cable assembly connect to

Answer 38

DDU

Question 39

How should iHDU cable assembly NOT be routed

Answer 39

Should not be routed under crewmembers right arm

Question 40

What is purpose of the IHDU combiner lens sliding clip

Answer 40

Sliding clip allows the crew member to position the combiner lens directly in front of their eye

Question 41

IHADSS LOS

Answer 41

Primary function of IHADSS is to establish the crew members LOS in reference to the ADL

Question 42

What do crewmember's boresight their AAIH to

Answer 42

Armament Datum Line

Question 43

After sizing and centering adjustments, what is required?

Answer 43

IHADSS Bore sighting

Question 44

Where is the grayscale option found>

Answer 44

Weapons page

Question 45

Moving scale displaying a total range of 360 degrees and is centered in the top area of the display

Answer 45

Heading Scale

Question 46

When will the heading scale not be displayed

Answer 46

If EGI information is not valid or EGI has have failed

Question 47

Aligned to the centerline of aircraft

Answer 47

Lubber Line

Question 48

Indicates heading to next navigation waypoint as selected from the Tactical Situation Display

Answer 48

Command Heading

Answer 49

Heading Miscompare Cue

Answer 50

Velocity Miscompare Cue

Answer 51

Attitude Miscompare Cue

Answer 52

FCR Centerline Bearing

Answer 53

Alternate Sensor Bearing

Answer 54

Automatic Direction Finder (ADF)

Answer 55

Radar Altitude HI/LO

Question 56

FOR

Answer 56

Field of Regard

Question 57

FOV

Answer 57

Field of View

Answer 58

Airspeed Digital Readout

Answer 59

Force of Gravity (G) Status

Question 60

Represents the LOS when sight is HMD or TADS and for WPNs aiming

Answer 60

LOS Reticle

Question 61

When does the LOS reticle flash

Answer 61

When LOS is invalid Sensor at limit Gun action with the gun failed (not following crew members head)

Question 62

IHADSS boresight required and flash

Answer 62

Cueing Dots

Question 63

Indicates intended direction and rate the aircraft is moving

Answer 63

Acceleration Cue

Question 64

Virtual position of the head's LOS relative to centerline of aircraft

Answer 64

Head Tracker

Question 65

When the aircraft is established in position (hover) hold and altitude hold, and the cyclic is moved more than 1/4" from the trimmed position, the aircraft will respond in the

Answer 65

Translation Rate Command (TRC)

Question 66

what is the primary indication of trc mode being active

Answer 66

Acceleration Cue shading

Question 67

what does the field of regard box represent

Answer 67

Total gimbal limits for the sensor/sig