23 Communications

Question 1

What does the SELCAL (Selective Call) system consist of?

Answer 1

A decoder mounted in the aft avionics comp, a control panel mounted in the pedestal in the cockpit.

Question 2

How is the SELCAL decoder powered?

Answer 2

No. 3 avionics bus through a 1 amp circuit breaker.

Question 3

When a SELCAL code is received what will happen?

Answer 3

You will receive a white HF SELCAL annunciator on the switch that blinks, and a single tone heard over the speakers.

Question 4

How many tone codes in the SELCAL decoder capable of receiving?

Answer 4

16 tone codes.

Question 5

How is the SELCAL system tested?

Answer 5

Via a SELF TEST button on the control panel, a single tone will be heard as well as the white HF SELCAL annunciator will blink for 5 seconds.

Question 6

How does the SELCAL decoder operate in normal operation?

Answer 6

When the HF radio is set to the AM Emission mode.

Question 7

Where are the jacks located for the ground intercom system?

Answer 7

2 Jacks are located on the nose landing gear landing light bracket.

Question 8

How is the ground intercom system activated and powered?

Answer 8

It is activated when ever the headphones are plugged in and powered through the hot battery bus

Question 9

What deactivates the ground intercom system.

Answer 9

When the avionics master is switched on or the airplane leaves the ground via the RH squat switch.

Question 10

Where is the amplifier for the ground intercom system located?

Answer 10

Top shelf in the nose avionics compartment.

Question 11

What can static electricity build up interfere with?

Answer 11

Radio, avionics, electrical equipment.

Question 12

How many static dischargers are there on the aircraft?

Answer 12

2 - Each winglet, 3 each aileron, 3 each elevator, 4 rudder, 1 each hori stab tip, 1 on each end of the bullet, 1 ventral fin, 1 on each main landing gear.

Question 13

What equipment is used to test the static wicks and what minimum voltage is required?

Answer 13

megohmeter with a minimum test voltage of 500 volts.

Question 14

When is the CVR powered on?

Answer 14

Anytime the aircraft power is on.

Question 15

There are 3 different models of CVR’s what are they?

Answer 15

CVR-A100S, CVR-30B, FA2100CVR

Question 16

How many channels and record time does the CVRA100S and -30B have?

Answer 16

4 channels , last 30 minutes of conversation at all times.

Question 17

How many channels and record time does the FA2100 CVR have?

Answer 17

6 channels, 120 minutes at all times.

Question 18

All 3 CVR’s have an impact switch, what does this component do?

Answer 18

Shut off the recorder on impact preventing loss of conversation recordings.

Question 19

Where are the component locations for the CVR system?

Answer 19

CVR & ULB - AV shelf in the empennage.
Microphone - RHS of glareshield.
Control Unit - pedestal extension.

Question 20

What is the purpose and life of the ULB attached to the CVR?

Answer 20

To activate upon water contact, battery operated with a life of 30 days, EXP date noted on the front panel.

Question 21

What must be done to the CVR to hear the read out?

Answer 21

Remove it from the aircraft.

Question 22

How can you tell the impact switch of the CVR system has been activated and how do you reset it?

Answer 22

Indicator light on the switch will illuminate, depress the reset button on the switch.

Question 23

What is the VHF-4000 transceiver used in conjunction with?

Answer 23

Radio tuning unit, control display unit an antenna and the airplane audio system to provide 2 way VHF voice comms.

Question 24

How do you tune the VHF-4000 transceiver?

Answer 24

Using the RTU or CDU

Question 25

What does the VHF-4000 Provide?

Answer 25

Double side band (DSB), Amplitude modulated (AM) voice/data operation in the Comms band of 118.000 thru 136.975

Question 26

The Collins HF-9000 High Frequency communication system provides what?

Answer 26

Worldwide communications capability.

Question 27

What does the HF system consist of?

Answer 27

HF-9031A receiver transmitter and a HF-9041 antenna coupler located in the aft avionics compartment. the HF antenna extends from the top of the fuse to the top of the vert stab.

Question 28

How can the HF system be controlled?

Answer 28

Via the CDU or RTU

Question 29

How is power provided to the HF system?

Answer 29

Left generator avionics bus, Two CB’s one for the receiver/transmitter (HF COM), one for the antenna (HF ANT), power is applied to the system when the avionics master is turned on.

Question 30

What band does the HF system operate in?

Answer 30

2.0000 to 29.9999 MHz in 100 Hz steps

Question 31

What are the 4 HF tuning modes?

Answer 31

Frequency tuning mode
Emergency tuning mode
Maritime tuning mode
Preset tuning mode

Question 32

How can you test the HF system?

Answer 32

Via the CDU or RTU, test can be carried out in flight or on the ground.

Question 33

How many transmission power ratings are there and what are they?

Answer 33

3 - LO-MED-HI

Question 34

What happens when the HF transmissions interfere with the ADF signal reception.

Answer 34

ADF freezes the existing bearing indication.

Question 35

What does the Aircell ST 3100 system provide?

Answer 35

Worldwide voice and data communication using the iridium satellite network of 66 low-earth orbit satellites.

Question 36

What range does the Aircell ST 3100 satellite telecommunication system work in?

Answer 36

1616 to 1625.5 MHz

Question 37

What does the Aircell ST3100 system consist of?

Answer 37

Satellite transceiver and modem, cordless handset, serial ports for laptops, telephone adapter, IRIDIUM PATCH ANTENNA, 2 circuit breakers.

Question 38

Where is power provided from for the Aircell ST 3100?

Answer 38

Left generator avionics bus through a TEL CB, power controlled by the avionics master switch.