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RT
Crash-Survivable
Memory Unit |
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The L-3 Communications, Electrodynamics (L-3/EDI) RT
Crash-Survivable Memory Unit (RT-CSMU) receives vehicle,
subsystem and environmental parameters from a MIL-STD-1553B
data bus, and stores these parameters in uncompressed
form in electrically erasable PROM (EEPROM) solid state
memory. It protects the data records from incidents
and mishaps, including crash protection exceeding FAA-TSO-C51a
levels. The RT-CSMU was developed for the F-22 aircraft
but can be easily adapted to other vehicles. L-3/EDI
also supplies a Flight Data Recorder suitable for recording
with the RT-CSMU.
Cleared by DoD/OFOISR for public release
under reference number 00-S-1235 dated April 17, 2000.
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| Features |
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0.5 MB to 2 MB EEPROM storage
capacity |
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100,000 memory write cycles
(minimum) |
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Power fail protection, memory
management and error detection for high integrity |
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RT-to-RT transfer available |
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Ready-to-record in 5 seconds
from turn-on |
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Can be driven from any processor |
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MIL-STD-1553B Notice 2 protocol |
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Extraction per B-1, B-2, T-45
methods and equipment |
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Less than one bit error per
million |
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BIT: Power-on, commanded, periodic |
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RS-232 test bus |
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Operational software is uploadable |
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Exceeds FAA-TSO-C51a crash survivability |
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Mounts with four captive bolts |
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Ground strap for composite vehicles |
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Convention cooled |
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100% ESS on all units |
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The RT-CSMU mounts in a survivable and
accessible area of the vehicle, up to 100 feet from
the recorder. It contains a microcontroller, 1553 and
RS-232 interfaces, power conditioner and 0.5 to 2 megabytes
of EEPROM memory. This highly reliable unit contains
no moving parts or adjustments. It is suitable for circular
loop rewrites as often as every 20 minutes or as long
as 12 hours, for up to 17,000 operating hours. The memory
format handles periodic and aperiodic parameters and
events, with read-after-write and CRC error-detecting
codes. All records are independent and self-documenting
as stored.
Unit built-in test is performed on power-up
or on external command. BIT status is available on the
1553 and RS-232 buses. Downloading can be performed
after an incident or at any time. Card-level and chip-level
data extraction equipment are available at L-3/ EDI.
Markings are inverted for ease of service on the vehicle.
The unit is not field-repairable due to its unique construction.
Cooling is by convection.
L-3 Communications, Electrodynamics,
a leader in solid-state recorder technology, has also
produced recorders for the B-1, B-2, F-4, and T-45 aircraft.
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| Design |
| MIL-E-5400—general |
| MIL-STD-883-integrated circuits |
| MIL-STD-2000-soldering |
| MIL-S-19500-semiconductors |
| MIL-C-38999G-connectors |
| MIL-STD-461/462—EMI |
| MIL-STD-810—environment
test |
| MIL-STD-1553B—data bus |
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| Specifications |
| Size: 3.8" H x 5.75" W x
5.4" L |
| Weight: 6.4 lbs. (2 MB) |
| Color: Fluorescent
international orange |
| Power: +16 to +40 VDC @
250 mA |
| Shock: 3400 g /5-8 ms. six
axis |
| Penetration: 10 foot drop
of 500 lb. weight, six axis, 0.05 inē |
| Crush: 5,000 lbs. for 5
minutes, six axis |
| Fire: 1100°C for 30 minutes |
| Seawater immersion: 1500
ft., 14 days |
| Fluids: Fuel, glycol, hydraulic,
fire extinguishing, for 24 hours |
| MTBF: 30,000 hours (MIL-HDBK-217E) |
| Life: 17,000 hours operating,
30 years useful |
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| This
PDF contains a printable version of the hard copy
catalog page. |
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Rt-csmu.pdf |
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Note: Viewing and printing PDF files requires the
free Adobe Acrobat Reader program. You can download
Acrobat Reader from Adobe's
web site. |
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