section 7-avionics Flashcards by Euan Gregg

where can 2 electric fans be fitted to cool the avionics equipment?

LH and RH avionics racks

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when do the avionics cooling fans operate?

whenever the 28V DC BUS 1 is enegerised

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what protects the avionics cooling fans?

AVIONIC COOL/BUS 1 on the AC/DC breaker panel

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can the avionics be operated individually if the avionic master circuit fails?

yes

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what does the intercom system provide?

communication between pilots, and monitoring of all COM and radio NAV equipment installed in the airplane

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what does the intercom system consist of?

2 microphone buttons, headset connections and 2 ICS EMERG switches on the pedestal panel

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what powers the intercom?

28v DC

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what protects the intercom system?

ICS 1/ESS BUS on the overhead breaker panel

- ICS 2/BUS 2 on the AC/DC breaker panel

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what is the intercom operating temperature range?

-20-+55C

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how do we transmit?

set the transmitter selector knob to the desired position and depress the. button on the control wheel

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what mode is HOT MIKE not available?

intercom

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how is communication receiver audio selected?

by depressing the appropriate communication selector button

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can more than 1 comms receiver be selected for receiver audio?

yes

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how are navigation recievers selected?

by depressing the appropriate navigation audio selector button

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what if the VOICE button is pressed?

identification signals (morse code) are suppressed and the voice transmission is clear- when the button is released voice and identification signals are of equal strength

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what is fed to the inter phone system when a warning light illuminates?

1kHz signal is fed to the inter phone

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what must be pressed to allow the pilots to transmit without using the headsets?

SPKR

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what does the ICS emergency switch do?

bypasses the normal ICS amplifier of the ICS control unit in case of amplifier malfunction by connecting the microphone directly to the selected communication system

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what is the headphone connected to in the EMERG position?

the speaker amplifier instead of the phone amplifier

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what must we do on the ICS panel if the ICS emergency switch is set to EMERG?

the SPKR button must be pushed in

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what is not possible with the ICS emergency switch set to EMERG?

intercommunication between pilot and co-pilot

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what will operation of the CALL button on either control wheel do?

trigger an audio signal to call the attention of the passengers with a 2 tone chime

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what do we hear when the NO SMOKE and/or fasten seatbelt signs are either ON or OFF?

2 tone chime

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what happens to signal and voice communication volume with either speed lever out of the LOW position?

volume will increase automatically

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how are pax announcements made?

switching the transmitter selector knob to PA and depressing the MIC button

what does the ground clearance switch allow?

enables the pilot to await clearance from ATC with all equipment off except VHF COM 1 provided the avionics master switch is off

what are the 3 modes of the VHF communication system?

frequency, channel and direct tuning

how many preset frequencies can be recalled into the STBY display in channel mode?

what is direct tuning mode used for?

a backup allowing frequency changes to be made directly into the USE display

what does the VHF communication system consist of?

- pedestal mounted receiver/transmitter - 1 VHF communication antenna for each system - interconnecting cables

what protects the VHF communication system?

- VHF 1/ESS-BUS on the overhead breaker panel | - VHF 2/BUS 2 on the AC/DC breaker panel

what is the VHF transmitter power?

up to 16 watts

what is the operating temperature range of the VHF communication system?

-20-+55C

how do we activate the VHF communication system?

rotate the on/off/volume knob clockwise from the detented off position

why should we switch on VHF comms after engine start?

to protect solid-state circuitry

how to we use manual squelch?

pulling the volume control knob

how do we know we are transmitting using VHF 1?

T indication

how do we check the VHF system is in the desired mode?

pulling small frequency selector knob out

what if a channel number is displayed in the USE display?

the VHF system is in channel mode

what if a frequency is displayed in the USE display?

the VHF system in frequency mode

how do we change the VHF mode of operation?

1. press the frequency transfer button for approximately 3 seconds until a flashing channel number is displayed in the USE display 2. pull out the small frequency selector knob and rotate it until a flashing zero is displayed in the USE display. the STBY display shows --- or uuu 3. to select frequency mode, select --- in the STBY display and press the frequency transfer button. a frequency is displayed in both displays 4. to select the channel mode, select uuu in the STBY display and press the frequency transfer button. a frequency is displayed in both displays 5. to select the program mode in order to change the frequency of a preset channel, select uuu in the standby display

what is the HF system capable of?

receiving and transmitting on any 0.1khz between 2000 and 26,999.9khz

how many frequencies can be preset for fast selection during flight on the HF communication system?

what does the KHF 950 HF system utilise?

an LSI (large scale integration) microprocessor and a frequency synthesiser.

what does the HF system transmit with?

100 watt of peak envelope power in single sideband.

what is the average power of the HF on AM?

25 watt

what are the HF systems 2 possible modes?

upper and lower sideband (A3J) and AM (A3H)

what does the HF system consist of?

- 2 KCU 951 panel-mounted control units - 2 KAC 952 remote power amplifier and antenna couplers - 2 KTR 953 remote recivers/exciters - 2 bridging amplifiers - 1 dual antenna adapter - 1 HF 1/2 selector switch - 1 antenna

what protects the HF communication system?

HF1/BUS 1 on the AC/DC breaker panel HF2/NON ESS BUS on the LH avionic rack breaker panel

what is the operating temp range of the HF system?

- remote units -55C to 70C | - control/display -20C to 70C

what does the HF 1/2 selector switch do?

selects the active HF system

what is the HF system connected to and partly controlled by?

intercom system

how long does the HF system take to warm up?

2 minutes

what are the 2 methods of frequency selection on the HF system?

direct tuning and channelised operation

what does the FREQ/CHAN button on the HF system do?

selects either direct tuning or preset channel operation in= CHAN (then select desired preset channel) out= FREQ (becomes operational on the frequency last transmitted on)

what should be done to protect the HF solid state circuitry?

system should only be activated after engine start up and the VOL control knob on the ICS unit set to a middle position

how do we set SQUELCH on the HF system?

rotating the SQUELCH knob clockwise until background noise is heard and then counterclockwise until barely edible or absent

what does the CLARIFIER knob on the HF system do?

assists in single sideband SSB reception when the ground station is slightly off frequency resulting in unnatural voice quality

how do we operate the CLARIFIER knob on the HF system?

when receiving an unclear transmission, pull out the knob and rotate it either way to give natural voice quality

what is the MODE button on the HF system used for?

USB,LSB and AM and is set by momentarily pressing the button until the desired mode is annunciated

how do we tune the HF antenna once we have selected the desired receiving frequency or channel?

press the MIC button

how long will tuning of the hf antenna take?

about 3 seconds

how do we know tuning of the HF antenna Is complete?

the TX stops flashing and the frequency digits reappear

how do we select desired transmission mode when the FREQ/CHAN button is out on the HF system?

push MODE until the desired transmission mode is displayed in the lower part of the display window

what is the PGM button on the HF system used for?

used to change the frequency and emission mode of a preset channel

what must be the same for transmitting and receiving on HF?

operating mode

what are the 2 ways to set up an HF channel?

recieve only and simplex

what will indicate a fault on the HF system?

flashing digits- this warning can be cleared by pressing the mic button

what is the range of VOR/LOC frequencies that the NAV receiver can use?

108-117.95mhz with 50khz spacing

what frequency range does the automatically tuned glideslope reciever use?

329.15-335mhz with 150khz spacing

how many VHF NAV systems are provided?

what powers the NAV system?

28v DC

what protects the NAV system?

NAV 1/ESS BUS on the overhead breaker panel NAV 2/BUS 2 on the AC/DC breaker panel

how do we silence the morse code on the NAV receiver?

push the knob in (voice info will still be heard)