PC-21 Secondary Flight Display

Question 1

What are the main sources of SFD Flight Data?

Answer 1

1) Internally mounted Inertial Sensor Pack (ISP) for attitude and slip indication
2) Magnetic Heading Sensor (MHS) for heading indication, fitted in the left wingtip.
3) Air Data Unit (ADU), for airspeed and altitude indication, situated in the avionics bay.

Question 2

Where does the SFD get navigational information from?

Answer 2

1) VOR/ILS 1 receiver

2) TACAN/DME transceiver

Question 3

How are the SFD and SFDR powered?

Answer 3

1) SFD from the emergency bus

2) SFDR from the BATT BUS

Question 4

What occurs if INSTRUCTOR switch is set to SOLO?

Answer 4

SFDR is de-energized.

Question 5

What information is shown on the SFD attitude indicator?

Answer 5

1. A/C reference symbol
2. Pitch information, including red V’s when pitch is +-55 to +-75 deg.
3. Roll information
4. Slip indicator

Question 6

What is the minimum speed that can be indicated on the SFD? What occurs below 40 knots?

Answer 6

• 40 KIAS

- Airspeed remains at 40 KIAS

Question 7

Are trend arrows for SFD airspeed and altitude shown?

Answer 7

Yes

Question 8

What does the ALN button on the SFD do? What limits is this button effective?

Answer 8

• Manually aligns the attitude indicator.

- Level flight within the limits of +- 30 deg of pitch and roll.

Question 9

How can brightness of SFD be changed in the cockpit manually?

Answer 9

Through DISPLAYS switch.

Question 10

What flight data does the SFD display?

Answer 10

• Attitude
• Airspeed
• Altitude
• Slip

Question 11

What navigation does the SFD display?

Answer 11

• Heading
• VOR 1
• ILS 1
• BC