Communications -System Description 737 Operations Manual

Cockpit Voice Recorder
The cockpit voice recorder uses four independent channels to save the last 30 minutes of flight deck audio. Recordings older than 30 minutes are automatically erased. One channel records flight deck area conversations using the area microphone. The other channels record individual ASP output (headset) audio and transmissions for the pilots and observer.
ACARS System (as installed)
The ARINC Communication Addressing and Reporting System (ACARS) is an addressable digital data link system which permits exchange of data and messages between an airplane and a ground–based operations center utilizing the onboard VHF–3 communication system.
The ACARS airborne subsystem provides for the manual entry of routine data such as departure/arrival information. Also possible is manual entry of addresses (telephone codes) of parties on the ground for voice communications.
The airborne system consists of a management unit (MU) in the E & E compartment, and interactive display unit (IDU), and a multiport printer. Data is entered and automatically transmitted to the ground operations center.
Page Routines
When the IDU is initially powered up (AC busses powered), it establishes contact with the ACARS and the digital flight data acquisition unit (DFDAU). The IDU screen then displays the MAIN MENU. This is the root page for accessing all other ACARS pages. Return to this MAIN MENU is possible by touching the MENU cue on any displayed page.
When a cue is touched on the IDU screen, the cue name is highlighted in reverse video. Moving the finger to another cue without breaking screen contact returns the cue first touched to normal video and highlights the new cue being touched. Releasing the highlighted cue activates the cue’s function.
The following cues are special in that they always perform the same functions:MENU, RTN, ENT, CLR, SEND, RE–DO, and VOX. Other cues are advisory cues. Advisory cues appear in place of **** on the standard ACARS menu. Some advisory cues flash from normal to reverse video: FAIL, DATA, SELC, MSG, and INIT. Other advisories are diaplayed in normal video: NOCOM, VOICE; and in reverse video: FAIL.
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5.20.6  August 1, 2003

Communications -System Description 737 Operations Manual
ACARS System Diagram

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Communications -System Description 737 Operations Manual

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5.20.8  December 1, 2000

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.10.1
Electrical Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.10.1 AC and DC Metering Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.10.2 Generator Drive and Standby Power Panel . . . . . . . . . . . . . . . . .  6.10.4 Bus Switching  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.10.6 Ground Service Switch  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.10.8
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.1
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.1 Electrical Power Generation  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.1 Engine Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.1 APU Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.1 External Ground Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.2 Ground Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.2 Electrical Power Schematic  . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.3 AC Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.4 Bus Transfer System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.4 Automatic Galley Load Shedding  . . . . . . . . . . . . . . . . . . . . .  6.20.4 APU Automatic Galley Load Shedding . . . . . . . . . . . . . . . . .  6.20.5 AC Power Schematic  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.5 Electrical Power Controls and Monitoring  . . . . . . . . . . . . . . . . .  6.20.6 Generator Drive  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.6 AC Voltmeter and Frequency Meter . . . . . . . . . . . . . . . . . . . .  6.20.6 DC Voltmeter and Ammeter . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.7 Electrical Power Controls and Monitoring Schematic  . . . . .  6.20.8 DC Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.9 Transformer Rectifier Units  . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.9 Battery Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6.20.9 Battery Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.20.10 DC Power Receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.20.10
　
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