PC-21 Flight Management System (FMS) Introduction

Question 1

What is the primary role of the PC-21 FMS?

Answer 1

A backup for managing communication with ATC and retrieving data in case of UFCP or MC failure.

Question 2

What is the secondary role of the FMS?

Answer 2

To functions a secondary NAV source

Question 3

What are the 3 main functions of the FMS?

Answer 3

1) Area Navigation (RNAV)
2) Backup tuning
3) Backup volume control

Question 4

What provides the FMS with information on waypoints, nav aids and airports?

Answer 4

Navigation database.

Question 5

What is involved in the RNAV function of the FMS?

Answer 5

1) Provides flight management capabilities
2) Provides flight management data for civil navigation
3) Provides customer database for storing defined routes/waypoints

Question 6

What is involved in the backup function of the FMS?

Answer 6

1) Backup radio/NAV/transponder tuning

Note: Can only tune the transponder when the MC is not available.

Question 7

What is involved in the backup volume control?

Answer 7

Control the volume levels of backup Radio/Nav/Intercom but ONLY when the MC is not available.

Question 8

How is the FMS screen + keypad brightness controlled?

Answer 8

• DISPLAYS knob = Screen brightness
• PANELS knob = keypad brightness
• BRT key on FMS keypad

Question 9

How can FMS be switched off?

Answer 9

By pressing the FMS button on the ELEC panel

- This turns off both cockpits FMS

Question 10

Where is the scratchpad on the FMS?

Answer 10

The bottom line of the FMS

Question 11

What does amber indicate on the FMS? What about green?

Answer 11

Amber = Alerting annunciation
Green = Advisory annunciation

Question 12

What are the two types of function keys on the FMS?

Answer 12

• General function keys

- Page selection keys

Question 13

Are scratchpad inputs made from one FMS transferred to the other cockpits FMS?

Answer 13

Yes

Question 14

What is primary means of controlling the COMM, VOR/ILS, TACAN and transponder units?

Answer 14

MC through the UFCP

Question 15

Can the FMS dually tune the NAV radios and UHF/VHF radios with the MC?

Answer 15

Yes

Question 16

Can the FMS dually tune the transponder or volume control with the MC?

Answer 16

No, only when the MC fails.

Question 17

What sensors does the FMS receive navigation data from?

Answer 17

• GLSSU providing GPS (primary means)
• Two VOR/ILS receivers provide bearing data
• TACAN transceiver supplies DME data
• ADC provides air data
• IRS provides position and heading input
• PFD supplies reversionary SFD data

Question 18

Where can FMS be displayed?

Answer 18

1) FMS display pages

2) PFD, MFD and the HUD

Question 19

What is the primary display of the FMS data ?

Answer 19

HSI in the mad mode on the PFD.

Question 20

How are the front and rear FMS powered?

Answer 20

By the BATT BUS.

Question 21

On power up, is the rear FMS slaved to the front FMS?

Answer 21

Yes

Question 22

What are the 4 phases of flight that the FMS computes and monitors?

Answer 22

• Enroute
• Terminal departure
• Terminal arrival
• Approach

Question 23

Does the FMS transition between different phases of flight automatically?

Answer 23

Yes

Question 24

When does FMS change between terminal departure to enroute?

Answer 24

When radial distance from departure airfield becomes > 33 NM or altitude becomes > 16,000 feet

Question 25

When does FMS change from enroute to terminal arrival phase?

Answer 25

When radial distance from destination airfield becomes < 30 NM and aircraft altitude is < 15,000 feet above destination airfield elevation.

Question 26

When does FMS change from terminal approach to approach phase?

Answer 26

- When intercept track angle to the final approach is < 90 deg - The aircraft position is within +- 60 deg of the final approach course - Approach has integrity

Question 27

What are the 5 NAV modes of the FMS in order of priority?

Answer 27

1) GPS through GLSSU 2) DME/DME mode 3) VOR/DME mode 4) IRS mode 5) DR mode

Question 28

What are the RNP and ANP ?

Answer 28

- Required nav performance and actual nav performance | - Actual nav performance must be within limits of RNP for that particular phase of flight, which the FMS calculated.

Question 29

What formula and geodetic mode does the FMS use to calculated nav data?

Answer 29

1) Great circle formulae | 2) WGS-84 geodetic mode of total earth

Question 30

What overall nav data does the FMS compute?

Answer 30

The distance and the required track from the present position to the next waypoint in the active route.

Question 31

Where are active waypoint shown in inverse cyan?

Answer 31

LEGS and PROGRESS pages

Question 32

In case of loss of GPS, DME and VOR signals, what does FMS use?

Answer 32

Dead reckoning calculations

Question 33

How does FMS switch between different nav sources?

Answer 33

Automatically by determining which is most reliable.

Question 34

What does DR mode rely on?

Answer 34

- Heading, TAS and last computer value of wind for navigation. - Accuracy will be degraded overtime.

Question 35

How does FMS calculate the TTG to next waypoints?

Answer 35

Using current wind and groundspeed

Question 36

Which page are system alerts shown? What colour are they in?

Answer 36

- MESSAGE RECALL | - Yellow

Question 37

What colour are maintenance messages shown?

Answer 37

White on MAINT MESSAGES page

Question 38

Where are status advisory messages displayed?

Answer 38

On the scratchpad in white.

Question 39

What does an amber FMS MSG on the MFD mean?

Answer 39

Where is an FMS system alert.

Question 40

When will FMS MSG annunciators turn off?

Answer 40

Once all messages have been used.

Question 41

When do FMS power up?

Answer 41

When BATT 1 or BATT 2 have been powered up

Question 42

What pages are used in flight plan creation?

Answer 42

1) RTE pages 2) DEP ARR pages 3) LEGS pages

Question 43

What does flight plan creation include?

Answer 43

1) Entering of ORIGIN and DEST airport 2) Entering the callsign 3) Waypoint entry 4) Departure and arrival procedure entry

Question 44

What can the FMS be used for in flight?

Answer 44

1) Modifying routes 2) Using the FMS holding pattern functions 3) Monitoring the route progress

Question 45

What is a requirement on this course?

Answer 45

1) Entering the ORIGIN and DEST airport 2) Entering the FLT NO 3) Both can be entered on the RTE page

Question 46

What buttons would you press if the ORIGIN and DEST airport for a flight are identical?

Answer 46

1) Press the ORIGIN LSK | 2) Then press the DEST LSK

Question 47

How can flight number be changed?

Answer 47

By typing the new callsign into the scratchpad followed by pressing the FLT NO LSK

Question 48

What should be done after entering the ORIGIN and DEST airport? Which page is this done through?

Answer 48

Waypoints should be created through the LEGS page

Question 49

What are the 3 priority sources for altitude data?

Answer 49

1) Barometer corrected altitude 2) Pressure altitude 3) GPS altitude

Question 50

On FMS RADIO page, what colours do Cyan, Yellow and Green indicate?

Answer 50

``` Cyan = active and valid Yellow = active + invalid Green = standby ```

Question 51

What does an ALTITUDE FAIL! system alert mean?

Answer 51

Primary ADC sourced input of barometer corrected and pressure altitude is lost

Question 52

What does an amber FMS FAIL caution message on the MFD mean?

Answer 52

1) FMS has failed 2) FMS data is not correct 3) FMS is selected to OFF

Question 53

What does PROGRESS page display?

Answer 53

Current RNP, ANP, PFD HIS scale and ETA for each waypoint.

Question 54

What is the bottom line of the FMS display known as?

Answer 54

Scratchpad

Question 55

Do the front and back FMS operate in tandem?

Answer 55

Yes