Communications

Question 1

Offside tuning light is illuminated white when

Answer 1

Radio normally associated with this panel is being tuned by antoher radio panel
or
Radio tuning panel is being used to tune a radio not normally associated with this panel

Question 2

VHF TEST switch causes

Answer 2

Removes auto squelch feature and permitts recpetion of background noise and thereby testing receiver operation
Improves reception of weak signals

Question 3

FAIL FAIL means

Answer 3

Selected radio has failed
Selected frequencies may continue to be displayed in the frequency indicator when radio is not available

PANEL FAIL = Radio tuning panel has failed

Question 4

Keyline timer

Answer 4

Limits VHF transmission to approx 35 secs

Approx 25 to 30 secs after PTT is selected the transceiver makes an aural tone (side tone) for 5 secs in the headset. When tone stops - transmission stops and radio is set to receive mode automatically

Question 5

Filter switch V/B/R means

Answer 5

V = NAV and ADF voice audio
B = NAV and ADF voice and range audio
R = NAV and ADF range audio

Question 6

Service interphone switch

Answer 6

Activates external jacks

Can still communicate with cc if switch is OFF

INT on control column selects flight interphone and bypasses the ACP transmitter selector (same as using I/C)

Question 7

CVR is activated when

Answer 7

Engine is started or
CVR switch is placed to ON

Question 8

CVR erase function

Answer 8

Hold down for 2 secs = all 4 channels erased
Operative on the ground and parking brake set

Question 9

CVR TEST switch

Answer 9

Push for 5 secs
Status light flashes once
Tone may be heard through a headset plugged into the headphone jack

Question 10

VOICE RECORDER switch in AUTO or ON

Answer 10

AUTO = Powers CVR from first engine start until 5 mins after last engine shutdown
ON = Powers CVR until first engine start then trips the switch to AUTO

Question 11

Speaker operation are the mic talk muted

Answer 11

Yes but for O2 mask operation they are not muted for microphone operation

Question 12

Do the CPT, FO and observer audio stations operate independantly

Answer 12

Yes

Question 13

Degraded operation to the ACP what works/doesn’t work

Answer 13

Transmitter selectors are not functional
CPT = VHF1
FO = VHF2
OBV = VHF1
Receiver switches are not functional
Radio heard at preset volume through headset
SPKR inop and switch inop
Flight interphone and service interphone inop and switches on control column
MASK-BOOM switch still works
Hand mic inop
Altitude alert, GPWS ad winshear not heard
Can’t access PA system through panel

Question 14

Where is the PA address system jack

Answer 14

P8 aft electronic panel

Question 15

VHF antenna location and issues

Answer 15

Upper (VHF1) and lower fuselage (VHF 2 and 3)

Lower antenna = susceptible to multipath interference from nearby buildings and vehicles
Upper = no interference

Question 16

When a HF frequency is tuned

Answer 16

Steady or intermittenent tone is heard through audio system

Tone can last as long as 7 secs

Longer than 7 secs to max 15secs = system has failed to tune

Question 17

How many frequencies are stored in the memory of the HF radio

Answer 17

Last 100 tuned frequencies

Question 18

How many channels on the CVR

Answer 18

4 independant channels

Question 19

How long does the CVR record for

Answer 19

120mins - auto erase after 120mins

Question 20

How long will the locator beacon on the CVR last

Answer 20

90 days