PS%20Engineering%20Audio%20Panel%20and%20other%20Audio%20Switchology

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PS Engineering Audio Panel and other Audio
Switchology

• Maj. Jeff Knutson

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PS Engineering Audio Panel

• Additional features for CAP operations
• More complicated than older units like KMA-24s
• May be confusing if crew unfamiliar with
  operation

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Features

• Can isolate pilot from rest of crew
• Useful in searches with heavy ATC or CAP
  communications
• Can isolate front seat from back seat
• Can have pilot talking on different frequency
  than observer
• Can swap frequencies
• Sometimes inadvertently!

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Operation
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Intercom Modes
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Intercom Modes
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Intercom Modes
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COM1
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COM2

• Activates audio for communication radio 2
• Operation just like other audio panels
• Green light illuminates when activated

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NAV1, NAV2, MKR, ADF, DME

• Activates audio for selected radio
• Operation just like other audio panels
• Green light illuminates when activated

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ICS (Intercom)

• Opens intercom between pilot and observer during
  split modes
• Green light illuminates when activated
• If not selected when split mode is selected pilot
  will again be isolated!

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COM3

• Activates audio for CAP FM radio
• Green light illuminates when activated

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SPR (Speaker)

• Turns on cabin speaker
• Operation just like other audio panels
• Green light illuminates when activated

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Transmitter Select Knob

• Selects on which radio the pilot and observer
  will transmit

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Transmitter Select Knob

• Pilot COM1
• Observer COM1

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Transmitter Select Knob

• Pilot COM2
• Observer COM2

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Transmitter Select Knob

• Pilot COM3 (CAP FM)
• Observer COM3 (CAP FM)

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Transmitter Select Knob - Split

• Pilot COM1
• Observer COM2
• Dont forget about ICS button!

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Transmitter Select Knob - Split

• Pilot COM1
• Observer COM3

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Transmitter Select Knob - Split

• Pilot COM2
• Observer COM3

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Transmit Light

• Illuminates when crewmember is transmitting on
  selected radio

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Swap Light
Look out for this!

• Illuminates when swap mode is selected on control
  yoke
• Effects determined by transmitter select switch
  position
• Swap button is the same type and is right next to
  the mic button
• Very easy hit hit accidentally
• Verify swap light mode when transmitting

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Swap Light Effects

• Toggles between COM1 (no light) and COM2 (light)

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Swap Light Effects

• Toggles between COM2 (no light) and COM1 (light)

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Swap Light Effects

• No swap

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Swap Light Effects

• Pilot COM1, Observer COM2 (no light)
• Pilot COM2, Observer COM1 (light)
• Again, in split mode, if ICS not selected pilot
  will be isolated

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Swap Light Effects

• Pilot COM1, Observer COM3 (no light)
• Pilot COM3, Observer COM1 (light)

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Swap Light Effects

• Pilot COM2, Observer COM3 (no light)
• Pilot COM3, Observer COM2 (light)

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DF Audio Switch
Remote panel switch

• Note there is no ELT DF button on audio panel
• How does the crew hear ELTs?

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DF Audio Switch

• Remote DF Audio toggle must be switched up to the
  ON position
• Turning up the volume on the DF unit wont help
  if the DF audio is switched OFF

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Problems

• Pilot cant hear the Observer. What could cause
  this?
• Audio panel turned off
• Intercom in ISO mode
• Transmitter select switch in split mode and ICS
  button not activated
• ATC has been quiet, and now they dont reply to
  my calls
• Check swap mode might have hit it on the last
  transmission and have been listening to the wrong
  frequency for the last 15 minutes

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Problems

• The scanner cant hear the front seat crew or
  radios?
• Intercom in Crew mode
• Headset is unplugged
• The crew cant hear the ELT beacon
• Volume on DF unit is too low
• The remote DF audio switch is turned off