A/C Systems 2

INS

100

Components (4)

What are:

- accelerometers

- stable platform

- computers

- CDU

200

Advantages of INS integration (2)

What is:

- improved accuracy

- higher mission completion rate (cuz sensors used independently)

300

10 initial conditions for alignment

What are:

- 2 initial Px

- 2 initial velocities

- 3 initial orientations

- 3 orientation rates

400

5 steps of self-alignment

What are:

1- warm up

2- coarse leveling

3- coarse alignment

4- fine leveling

5- fine alignment

500

High latitude alignment problems (2)

What are:

- undetectable tilt

- cannot resolve TN

IRS

100

Components (2)

What are:

- IRU

- MSU

200

Modes of operation (4)

What are:

- OFF

- ALIGN 

- NAV (uses align info to calculate Px, velocity, hog, altitude)

- ATTITUDE (selected when A/B to output the nav solution)

300

This is provided during NAV mode

What is inertial Px reference for the A/C

Which includes:

- A/C & inertial attitude

- body rates & accelerations

- velocity vectors

- Px

- TH & MH

- wind date

400

These conditions prevent alignment (2)

What are:

- if the A/C is moving 

OR 

- if current Px is > 1 degree from last stored Px

500

Warning light indicates either of these 2 conditions

What are:

- system malfunction preventing alignment

OR

- latitude inaccurate by > 1/2 degree

TRANSPONDER, RADALT, ADS

100

Transponders provide this information

What is A/C ID and altitude

200

Military codes (3) 

Civilian codes (3)

Special mode codes (3)

What are:

- military (1, 2, 4) 

- civilian (3/A, 3/B, 3/S)

- 7500 (hijack), 7600 (comms nix), 7700 (emerg)

300

ADS Components (4)

What are:

- 2 pitot tubes

- 2 static ports

- 2 temperature bulbs

- 2 DADCs

400

How RADALT works

What is:

- A/C transmits a pulse that is reflected back from the ground

- time difference between sent/received signals is converted to height above terrain

500

Range of the CT-142 RADALT

What is:

0-2500FT AGL

NAVAIDS & GPS

100

RMI displays compass bearing to this type of navaid, and magnetic bearing to this other type

What are: 

- ADF (compass bearing)

- VOR (magnetic bearing)

200

This type of navaid has a range of 50-200NM, and is subject to atmospheric interference

What is the ADF

300

This type of NAVAID has a range of LOS, and a 60-110^o cone of confusion

What is a TACAN

400

GPS Code characteristics:

- available to all users

- 1.023 MHz transmission rate

- used to acquire the other code

- less accurate

What is the C/A code

500

GPS Code characteristics:

- available to military users

- 10.23 MHz transmission rate

- used for nav ranging

- more accurate

What is the P code

GPS, WAAS, ADS

100

WAAS

What is Wide Area Augmentation System

i.e. a ground reference Rx that is used to eliminate GPS errors

200

Sources of GPS errors (2)

What are:

- user range error (largest source comes from atmospheric modelling errors)

- dilutions of precision (from fix geometry < 90^o)

300

The CT-142 GPS uses this type of code receiver, and provides these 6 things via an emulated GPS

What is a C/A code Rx and

- Px & time

- satellite info

- altitude

- ground track

- G/S

- TAS 

400

ADS components (4)

What are:

- 2 pitot tubes

- 2 static ports

- 2 temperature bulbs

- 2 DADCs

500

How the ADS works

What is:

- pitot tubes detect total pressure

- static ports detect static pressure

- airspeed indicator finds differential pressure (from static and pitot pressure) to determine IAS

- temp bulbs measure OAT