AS 10 - Comms Systems Flashcards
Review Questions
How many portable oxygen systems are on board and where are they?
3
Behind co-pilot
In the emergency stowage next to airstair door
Beside baggage compartment door
Review Questions
Approximately how long will the portable oxygen system provide O2?
15 mins at 100% O2
The Audio Integration System at each student console consists of what?
Audio control panel
Headset with PTT switch
PTT switch on foot rest
The Audio Control Panel provides aircrew with the means to? (4 answers)
Control transmission and reception on external radios
Communicate internally on different interphone conferences
Monitor the AC navigation receivers (VOR/ ADF)
Access the passenger address (PA)
Where are Audio Control Panels located throughout the plane?
Student stations Instructor stations Crew rest area Flight attendants panel FE Pilots
How many interphone conferances are available? what are they?
3
INT
PRI 1
PRI 2
Which intercom conferences are to be used by who?
INT - available to all positions
PRI 1 - Available to pilots, FE I!, I@ and rest areas
PRI 2 - Students and instructors, crew rest area can select which PRI 2 to listen to
Is there an Audio Control Panel in the jump seat? If so, what is different regarding comms?
Yes there is.
If yo swish to speak, you must press the INPH switch to talk on INT
By selecting PA on the audio selector, what can crew members use to communicate?
Does this work at consoles?
5 speakers
No, SPKR switch is inoperative at consoles
In the event of an electrical failure, which position’s audio control panel will enter emergency audio integration mode?
The pilot, co-pilot and FE’s
In the event of an electrical failure, which position’s audio control panels will enter emergency audio integration mode and revert to which settings?
Pilot: VHF 1 and VOR 1
Co-Pilot: VHF 2 and VOR 2
The HF CT-142 radio system consists of what?
King KHF 950 HF radio
Radio control panels
Transceiver
Antenna
Where are the following located?
Radio control panels
Transceiver
Antenna
Radio control panels: located at each student/ instructor console and center console of the flight compartment
Transceiver: Avionic rack
Antenna: Leading edge of vertical stabilizer
What is the HF freq coverage and the preset channel capacity?
Freq coverage: 2.0 - 29.999 MHz
Capacity for 19 preset channels
The HF is capable of communicating using what?
USB (upperside band)
AM (amplitude modulation)
A3J (Maritime Radio-Telephone Network)
On the HF radio at the student’s stations, selection of the LSB and Maritime Radio-Telephone operation results in what?
The LSB and Maritime Radio-Telephone operation are disabled.
Instead, they connect to USB and A3J modes when selected.
On the CT-142, the volume control is set to what? What does the HF audio output control?
Mid range
The output level
On the CT-142, if the volume control is set too high what can happen?
It can overpower the coupler and affect transmission
On the CT-142, the squelch control does what? What is the 402 procedure?
Adjusts threshold of received signal (reduce static)
Turn Squelch off.
What are the possible selections for the Emission Mode Select? What is the default?
LSB, USB, AM
Set to USB
On the CT-142, what does the Frequency/ Channel control do?
Used to selected frequencies and channels
On the CT-142, the Memory Storage Button has what two functions?
Used to select one of 19 reset channels
Used to remove error messages
How do you know if the radio is tuning?
‘TX’ is flashing
How many people can have control of the HF at a time? How do you know if you have control?
1 person at a time
You know you have control if the CDU panel will be illuminated
What are the steps to tuning the radio?
Take control of HF radio
Adjust volume and squelch
Set desired frequency: Push freq selector knob, rotate it until desired digit displayed, push knob again to switch to the next
number you wish you change.
Once desired freq is displayed, select HF on ICS panel, key mic once and wait until TX stops flashing.
Once flashing stops, transmit a message
If unable to tune radio, what are the trouble shooting steps?
Change volume setting, put back to mid range
Recycle power (on/off)
Have another station take control of HF
Have pilots take control of the HF, then take back after two minutes
What is SELCAL and why is it important?
Stands for selective calling.
Each AC is assigned a four letter code, when the ground station xmits this code, a light on the CELCAL panel will illuminate and the crew will get a tone through their headsets.
Allows crew to monitor HF radio w/o having to listen to static or chatter that isnt relevant to your AC
What are the VHF King KTR-908 Radio specifications? Modulation: Freq Range: Spacing of channels: LOS? High or low power? Preset channel capacity: Communication: Weather DF?
Modulation: AM Freq Range: 118.000 - 151.975 MHz Spacing of channels: 25 MHz LOS? Yes High or low power? Low Preset channel capacity: 9 Communication: Quiet and static free Weather: not affected by weather DF? Capable of DF
What are the VHF King KTR-908 Radio components and their locations?
Two CDUs, one per radio: center console of flight compartment
Two Transceivers: avionics rack
Antenna
What are the UHF AN/ARC-164 Radio specifications? Modulation: Freq Range: Preset channel capacity: LOS? Communication: Weather DF? Power needed:
Modulation: AM Freq Range: 225.000 - 399.975 MHz Channel spacing: 25 KHz Preset channel capacity: 20 LOS Operation? Yes Communication: Quiet and static free Weather: Not affected by weather DF? Capable of it Power needed: 28 V DC
What are the UHF AN/ARC-164 Radio components and their locations?
2 Transceivers: located in cockpit center of pedestal, aft of power levers
1 main transceiver and 1 guard receiver
1 control head - co-located with transceivers on center pedestal
Antenna
What are the ICS procedures?
Lead student will ask the pilots to tune to the desired frequency or verify what is set
Advise crew you’re going out on radios or coming back in. This way they know you’re busy, and with HF other students will know its being used.
Update crew with any info received
Review Questions
How do you know which console has tuning control of the HF radio?
Green bar is illuminated at the HF control switch
Review Questions
What is squelch and where do we set the squelch to when using the HF radio on the Dash-8?
Reduces background noise / Full clockwise
Review Questions
How do you get rid of an error message (E) in the display window?
Press the STO button
Review Questions
Do the VHF radios on the CT-142 use AM or FM?
AM
Review Questions
What is the frequency range for VHF radios?
118.000 - 151.975 MHz
Review Questions
How many Receiver/ Transmitters are there on the CT-142?
2
Review Questions
What is the practical UHF frequency band for the CT-142? What are the step separated by?
225.000 - 399.975, divided into 25 KHz steps
