An Audio Control Panel (ACP) is selected to ALT rather than NORM at the captain’s station. Which communication capability remains available?, Only Very High Frequency 1 (VHF 1) receive and transmit using the boom or oxygen-mask microphone, All selected radios remain available, but receiver-volume control is lost, Only the hand microphone and service interphone remain available, A ground engineer connected to an external service interphone jack can hear system audio but cannot transmit. Which condition most directly explains this?, The SERVICE INTERPHONE switch is OFF, which removes external microphone inputs but does not remove received audio, The Remote Electronics Unit (REU) has failed completely, The external service jack is receive-only unless the flight crew selects SERVICE on an Audio Control Panel, Simultaneous Passenger Address (PA) audio is requested from the flight crew, an attendant microphone, and the Pre-Recorded Announcement and Boarding Music (PRAM) system. Which source is transmitted?, The PRAM announcement because prerecorded emergency audio always has priority, The attendant microphone because cabin-crew audio overrides cockpit audio, The flight crew microphone because it has the highest PA audio priority, During cabin decompression, what change does the Passenger Address (PA) system make to compensate for the increased ambient noise?, It increases amplifier gain by 3 decibels, It doubles speaker line voltage and inhibits boarding music, It automatically increases only flight-crew microphone gain by 6 decibels, A Radio Tuning Panel (RTP) displays normal active and standby frequencies even though the selected Very High Frequency (VHF) transceiver has no power. Why can this occur?, The RTP interprets loss of transceiver power as a valid standby condition rather than an internal RTP failure, Frequency display alone does not prove that the RTP is receiving valid transceiver data, The RTP automatically generates substitute Aeronautical Radio Incorporated 429 data when the transceiver is unpowered, During Satellite Communications (SATCOM) maintenance, an intermodulation test returns SUSPECT rather than FAIL. What is the most accurate interpretation?, The Satellite Data Unit has positively failed and must be replaced, The test did not meet the Owner Requirement Table limits, The test results may be unreliable because of conditions such as unstable noise or mismatched test frequencies, An operator wants to change Satellite Communications (SATCOM) telephone directories and other operator-defined configuration data. Which software/configuration item is specifically intended for that purpose?, The Selective Calling Program Switch Module, The Owner Requirement Table (ORT), The Aeronautical Communications Addressing and Reporting System Management Unit configuration database, The Selective Calling (SELCAL) decoder receives audio tones that match the aircraft’s programmed SELCAL code. What action follows?, The decoder directly keys the associated radio transmitter, The decoder generates the required visual alert and energizes the aural-warning path, The Radio Tuning Panel automatically transfers the called frequency into the active window, Under what conditions can recorded audio be erased using the Cockpit Voice Recorder (CVR) panel?, Airplane on the ground with the parking brake set, Both engines shut down regardless of parking-brake position, Airplane on the ground with external power connected and the CVR switch selected ON, On the flight-deck entry video surveillance system, what is the purpose of the Camera Control Unit (CCU) installed near each infrared camera?, It digitally records video locally and transmits compressed video to the MAX Display System, t converts supply voltage, changes the video signal from unbalanced to balanced, and changes output impedance for the video switch, It controls infrared illumination intensity and automatically selects the active camera

ATA 23

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