SSCVR
SOLID-STATE COCKPIT VOICE RECORDER
PRODUCT DESCRIPTION
SSCVR
Solid-State Cockpit Voice Recorder
ED-56a Voice Recording System
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SOLID-STATE COCKPIT VOICE RECORDER |
Description |
SOLID-STATE CVR PRODUCT DESCRIPTION
The Solid-State Cockpit Voice Recorder (SSCVR) combines the extremely high reliability of integrated circuit memory technology with the most advanced protective enclosure in the industry. This equipment fully satisfies the most recent FAA and EUROCAE Minimum Operational Performance Requirements (MOPR) for Cockpit Voice Recorders used on commercial air transport and general aviation aircraft, whilst allowing direct retro-fit into existing ARINC-557 installations. These specifications are:
•EUROCAE Documents ED-56, and ED-56a, October 1993
•FAA Technical Standard Order TSO C-123
•ARINC-557 and ARINC-757, Cockpit Voice Recorder (CVR), August 1993 (draft 2)
•JAR requirement for 2 Hour audio recording per ED-56a
In addition, the SSCVR currently includes provisions in anticipation of the following future legislation:
•Legislation making the recording of data linked air traffic control messages mandatory via a dedicated ARINC-429 Input
The SSCVR utilizes a modular crash survivable memory unit (CSMU) for protection of the solid state voice recording memory. The CSMU retains the most recent 30 minutes or 2 hours of audio, digital, and timing information. Both Honeywell’s 30 minute and 2 Hour SSCVR models are approved to TSO C-123.
"State of the art" high density FLASH memory devices are combined with the use of mature industry standard audio digitization and encoding integrated circuits (ICs).
•Provides a consistently high level of recording quality over the entire audio range.
•Avoids the risk and complexity of immature proprietary compression algorithms.
Figure 1 shows the SSCVR and its major features, while Figure 2 provides a simplified diagram showing its major aircraft interfaces.
ED-56a Crash Survivable |
Under Water |
Memory Unit (CSMU) |
Locator Beacon |
(30 min. or 2 hr. model) |
(ULB) |
115Vac/28Vdc |
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Power Supply |
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ED-56a |
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Microphone Monitor |
ARINC-757 |
Controller Board |
Aircraft Interface |
ED-56a Audio Processor |
Figure 1: |
Solid-State CVR System, Major Features |
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SOLID-STATE COCKPIT VOICE RECORDER |
Description |
Microphone
Monitor
Mic. #1 Mic. #2 Mic. #3 |
Test/Erase/Status |
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Composite Audio |
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Area Mic. (WB audio) |
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Narrow Band Audio |
Rotor |
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Tachometer |
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Rot. Freq. |
Capt. Clock |
GMT |
14:30:15 |
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FSK Timing |
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BITE |
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ATC |
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SSCVR
Recorder
Flight Data
Acquisition Unit
CMU OMS
Other Subsystem Provisions
Figure 2: Solid-State CVR, Major Aircraft Interfaces
The SSCVR is the most modern available, incorporating the latest interface characteristics defined in ARINC 757. Audio interface provisions include one (1) wide band and three (3) narrow band channels meeting the improved signal to noise and bandwidth characteristics specified in ED-56a. In addition to the audio inputs, the SSCVR also records timing information from either of two sources, GMT from the captains clock or FSK from the flight data acquisition unit. A dedicated tachometer input is provided for recording of rotor speed in helicopter applications.
Both the 30 minute and 2 hour SSCVR currently include two ARINC-429 interfaces; one is reserved for future recording of air traffic control digital message communications, and the second is provided for new generation aircraft equipped with Onboard Maintenance Systems.
The SSCVR has been designed to achieve a high degree of reliability, as well as facilitating simplified maintenance and minimal component sparing over competing models.
•High Mean Time Between Failure -
in excess of 10,000 hours predicted (per MIL-HDBK-217F) and in excess of 20,000 hours field operation anticipated.
•No Scheduled or Periodic Maintenance is required.
•Consists of only (3) three Shop Replaceable Units.
•Dual voltage power supply provides fleet wide commonalty.
Extensive micro-processor based built-in-test greatly simplifies test and trouble shooting, thereby minimizing technician training and support equipment costs.
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SOLID-STATE COCKPIT VOICE RECORDER |
Description |
1.0SSCVR DESIGN OVERVIEW
The SSCVR is a single Line Replaceable Unit (LRU) in a standard ARINC-404A style avionics form factor. The SSCVR chassis includes three (3) Shop Replaceable Units (SRU's) and an optional underwater locating device. SRUs include:
a)Interface and Control Board (ICB)
b)115Vac/28Vdc Dual Voltage Power Supply (PS)
c)Crash Survivable Memory Unit (CSMU)
d)Under Water Locator Beacon (ULB)
The breakdown of major components and SRU accesses are summarized in Figure 3.
Handle or |
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Underwater Locator |
ULB Mounting |
Beacon (ULB) |
(4 Places) |
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Crash Survivable
Memory Unit (CSMU)
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PS Access Cover |
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Power Supply (PS) |
CSMU Mounting Shelf |
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Interface & Control |
ARINC-404A |
Chassis |
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Circuit Board (ICB) |
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ARINC-404A |
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Connector |
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ICB Access Cover |
Figure 3: SSCVR Exploded View Showing Major SRUs
All three SRUs are readily accessible without requiring major disassembly. The CSMU may be removed from its mounting shelf by simply removing four bolts and releasing its mating connector. The plug-in power supply may be accessed by removing the top (power supply) access panel. Access to the plug-in interface controller board is accomplished by removing the bottom cover panel from the SSCVR chassis.
An optional under water locator beacon (ULB) approved to TSO C-121 is mounted on the front of the unit and also serves as a handle. Four (4) mounting bolts firmly attach the ULB directly to the front of the CSMU to avoid separation in the event of an incident. The mounting of the ULB also facilitates easy access for replacement of its battery. If the SSCVR is purchased without the ULB, a hollow metal tube is mounted in its place.
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