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Aircraft Systems > AS 12 - CT-142 and Emulated INS (INS 2) > Flashcards

AS 12 - CT-142 and Emulated INS (INS 2) Flashcards

1
Q

Review Questions

What are the problems which inhibit alignment at high altitudes?

A

Undetectable tilt (simulated by computer) preventing initiation of gyro compassing

Inability to accurately resolve true north

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2
Q

Review Questions

How long is the Schuler Period?

A

84.4 minutes

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3
Q

What are the two components for the Honeywell IRS?

A

Inertial Reference Unit (IRU)

Mode Selector Unit (MSU)

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4
Q

What components does the IRU contain?

A

Inertial sensor assembly
Microprocessors
Aircraft electronic interfaces
Power supplies

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5
Q

Where is the IRU located and housed?

A

Located under center floor of crew compartment

Housed on a rack that also serves as mechanical interface between IRU and aircraft.

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6
Q

What does the MSU provide?

A

Inertial mode selection, status indication and remote test initiation.

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7
Q

Where is the MSU located?

Go over this card with the presentation, im assuming i meant “MSU control panel”

A

Flight deck center console

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8
Q

What kind of system is the Honeywell IRS?

A

A strap-down, Schuler-tuned inertial reference system.

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9
Q

Accelerometers and ring laser gyros in the inertial sensor assembly measure what?

A

Accelerations and angular rates of the aircraft

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10
Q

What kind of power does the IRU receive? What are the associated voltages?

A

The IRU can receive AC or DC power and provides the switching to primary or secondary DC

The IRU can operate with either 115V AC or 28V DC voltages

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11
Q

Does the IRU require a cooling air supply? If so, how is this supplied?

A

Yes, it is supplied through the air conditioning system or the AC/DC blower kits.

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12
Q

If a loss of cool air to the IRU occurs, what must happen after a specified time?

A

Shutting down the IRU

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13
Q

What are the four basic inertial modes for the IRU?

A

Off
Align
Nav
Attitude

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14
Q

Describe the Align Mode for the IRU

A

The IRU aligns it’s reference axes to the local vertical and computes heading and latitude by measuring horizontal earth rate components

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15
Q

How long does the IRU take to align at the equator, between latitudes 60 & 70 and above 70 Deg?

A

60: 2.5 minutes
Between 60 and 70: Maximum of 10 mins
Over 70: More than 10 mins

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16
Q

In Nav Mode, the IRU supplies inertial position reference for the aircraft and provides outputs via the FMS:

A 
Aircraft attitude
Velocity vectors
Body rates
Body accelerations
True heading
Wind data
Inertial attitude
Lat and Long

(A Very Bored Boy That Waits In Line)

17
Q

What does the IRS use as the starting point for positional computations?

A

The Lat/ Long entered during the align mode

18
Q

The nav components calculate what in nav mode?

A

Present position
Velocity
Heading
Attitude

19
Q

Attitude Mode, once rapid levelling has been completed, provides valid outputs of:

A

Body axis accelerations
Attitude rates and angles
Vertical velocities
Inertial attitude

(Bodies Are Vertically Inline)

20
Q

What is not provided in Attitude Mode?

A

Navigation outputs

21
Q

When should Attitude Mode be selected in the air?

A

When the MSU fault enunciator illuminates

After the IRS has temporarily lost all power

22
Q

What are the Alignment requirements?

A

Operator must enter present position via the FMS

IRU conducts a reasonability test of new position: compares with previous position at last shutdown

23
Q

How might the Alignment test fail?

A

If the new position is > 1° of the stored value

24
Q

A correct Alignment test may fail if?

A

A new IRU has been installed; or

Aircraft was moved since its last shutdown

25
Q

How can you overwrite an Alignment test?

A

Entering identical coordinates twice

26
Q

At the end of the Alignment phase, what must pass the System Performance Test?

A

Latitude

27
Q

Regarding the Systems Performance Test, the latitude entered must be within?

A

30 min of arc of the latitude computed by the IRS during alignment.

28
Q

If an entered latitude passes the system performance test, alignment is complete and it allows entry to what mode?

A

Navigation mode

29
Q

Information is fed from the IRU directly to the ATS. The ATS maintains a database of inertial information including:

A 
True heading
True track angle
Present Lat and Long
Inertial ground speed
Wind velocity
System status

(The True Problem Is Windy Seas)

30
Q

How is IRU data given to the pilots and the navs?

A

IRU data to pilots through FMS

IRU data to navs through ATS via FMS

31
Q

True of false

The aircraft IRU (INS) operates as any INS does?

A

True

32
Q

On the emulated INS control panel, what three modes are there?

A

Manual - allows manual leg changes

Automatic - automatically sequences to the next waypoint capture

Remote - Allows system manipulation without affected system navigation to current waypoint

33
Q

Nav and position info is sourced from what?

A

The IRU

34
Q

How many waypoints can the INS hold?

A

Max of 20

35
Q

Review Questions

What is the source of the inertial information used by the ATS?

A

The aircraft IRU

36
Q

Review Questions

What does the “Alert” annunciator on the Waypoint Information frame indicate?

A

90 seconds to the next waypoint or 90 seconds abeam if off track

37
Q

Review Questions

What does the Warning annunciator on the Position Area indicate?

A

A malfunction is preventing alignment of the IRU; or

A latitude that is inaccurate by more then 1/2 a degree is entered

38
Q

Review Questions

What are the two main components of the IRS?

A

Inertial Reference System

Mode Selector Unit

39
Q

Review Questions

What are the two main type of information provided by the INS?

A

Navigation and Attitude

Aircraft Systems (19 decks)

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