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The HF Maintenance Log provides the maintenance log for on-side HF radio operation. The Maintenance page is a ground maintenance function and will not be covered in this manual.
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Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
HF Memory and Control Pages
The HF Control page provides active and preset channel tuning, emission mode control, memory channel recall/store, HF status, squelch level tuning and transmitter power level tuning.
The HF Memory page provides active channel tuning, memory channel tuning and HF status.
HF 1 MEMORY Page HF 1 CONTROL Page
GF0610_049
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
The Selective Calling System (SELCAL) monitors the ground stations for a four letter tone code that is transmitted to the airplane on the VHF or HF communication systems. When the SELCAL receives the code, it sends a visual and aural message to alert the flight crew.
The SELCAL decoder unit located in the forward avionics equipment bay, has five audio input channels used to monitor the audio output from:
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VHF COM 1.
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VHF COM 2.
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VHF COM 3.
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HF COM 1.
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HF COM 2.
The SELCAL interfaces with the audio integrating system (audio control panels), flight compartment speakers and EICAS. Each airplane is assigned its own SELCAL code at the time of installation. Upon receiving the code for which it was programmed, the SELCAL will signal the audio integrating and EICAS systems that a call has been received.
Operation
The VHF and/or HF communication systems are tuned to a SELCAL frequency that has been assigned to a ground station.
When a ground station wants to talk to the flight crew, the ground station sends a SELCAL code on the assigned frequency. The SELCAL unit monitors the VHF and HF communication systems audio output channels.
When a SELCAL signal is received, the decoder checks the signal tones for the correct frequency, sequence, amplitude, and duration.
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If all the parameters are met, a SELCAL HF or VHF advisory message will be displayed on EICAS and the audio integrating system will command an aural message “SELCAL, SELCAL”in the flight compartment speakers and headsets.
The pilot selects the respective VHF or HF system on the audio panel and when the Push-To-Talk (PTT) switch is pushed, the EICAS message is cancelled.
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
The Radio Altimeter (RA) system provides airplane altitude above the terrain up to +2550 feet. The RA system is comprised of two RA transceivers, each connected to two separate antennas. The antennas are identical and dedicated, one for transmitting and the other for receiving. The antennas are positioned on the bottom centerline of the fuselage to minimize performance degradation in turns and prior to landing while in the flare on landing.
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