23 Communications Flashcards
What does the SELCAL (Selective Call) system consist of?
A decoder mounted in the aft avionics comp, a control panel mounted in the pedestal in the cockpit.
How is the SELCAL decoder powered?
No. 3 avionics bus through a 1 amp circuit breaker.
When a SELCAL code is received what will happen?
You will receive a white HF SELCAL annunciator on the switch that blinks, and a single tone heard over the speakers.
How many tone codes in the SELCAL decoder capable of receiving?
16 tone codes.
How is the SELCAL system tested?
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.
How does the SELCAL decoder operate in normal operation?
When the HF radio is set to the AM Emission mode.
Where are the jacks located for the ground intercom system?
2 Jacks are located on the nose landing gear landing light bracket.
How is the ground intercom system activated and powered?
It is activated when ever the headphones are plugged in and powered through the hot battery bus
What deactivates the ground intercom system.
When the avionics master is switched on or the airplane leaves the ground via the RH squat switch.
Where is the amplifier for the ground intercom system located?
Top shelf in the nose avionics compartment.
What can static electricity build up interfere with?
Radio, avionics, electrical equipment.
How many static dischargers are there on the aircraft?
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.
What equipment is used to test the static wicks and what minimum voltage is required?
megohmeter with a minimum test voltage of 500 volts.
When is the CVR powered on?
Anytime the aircraft power is on.
There are 3 different models of CVR’s what are they?
CVR-A100S, CVR-30B, FA2100CVR
How many channels and record time does the CVRA100S and -30B have?
4 channels , last 30 minutes of conversation at all times.
How many channels and record time does the FA2100 CVR have?
6 channels, 120 minutes at all times.
All 3 CVR’s have an impact switch, what does this component do?
Shut off the recorder on impact preventing loss of conversation recordings.
Where are the component locations for the CVR system?
CVR & ULB - AV shelf in the empennage.
Microphone - RHS of glareshield.
Control Unit - pedestal extension.
What is the purpose and life of the ULB attached to the CVR?
To activate upon water contact, battery operated with a life of 30 days, EXP date noted on the front panel.
What must be done to the CVR to hear the read out?
Remove it from the aircraft.
How can you tell the impact switch of the CVR system has been activated and how do you reset it?
Indicator light on the switch will illuminate, depress the reset button on the switch.
What is the VHF-4000 transceiver used in conjunction with?
Radio tuning unit, control display unit an antenna and the airplane audio system to provide 2 way VHF voice comms.
How do you tune the VHF-4000 transceiver?
Using the RTU or CDU
What does the VHF-4000 Provide?
Double side band (DSB), Amplitude modulated (AM) voice/data operation in the Comms band of 118.000 thru 136.975
The Collins HF-9000 High Frequency communication system provides what?
Worldwide communications capability.
What does the HF system consist of?
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.
How can the HF system be controlled?
Via the CDU or RTU
How is power provided to the HF system?
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.
What band does the HF system operate in?
2.0000 to 29.9999 MHz in 100 Hz steps
What are the 4 HF tuning modes?
Frequency tuning mode
Emergency tuning mode
Maritime tuning mode
Preset tuning mode
How can you test the HF system?
Via the CDU or RTU, test can be carried out in flight or on the ground.
How many transmission power ratings are there and what are they?
3 - LO-MED-HI
What happens when the HF transmissions interfere with the ADF signal reception.
ADF freezes the existing bearing indication.
What does the Aircell ST 3100 system provide?
Worldwide voice and data communication using the iridium satellite network of 66 low-earth orbit satellites.
What range does the Aircell ST 3100 satellite telecommunication system work in?
1616 to 1625.5 MHz
What does the Aircell ST3100 system consist of?
Satellite transceiver and modem, cordless handset, serial ports for laptops, telephone adapter, IRIDIUM PATCH ANTENNA, 2 circuit breakers.
Where is power provided from for the Aircell ST 3100?
Left generator avionics bus through a TEL CB, power controlled by the avionics master switch.
