Publication No. GBX24-0HH/2
Specifications 41
A.4 Environmental Specifications
A.4.1 Convection-cooled Boards
Table A-4 Convection-cooled Environmental Specifications
Build Style
Temperature (°C)
Vibration
Shock
Humidity
Comments
Standard
(Level 1)
Operating:
0 to
+55 with airflow of
300 feet/minute.
Storage:
-50 to
+100
Random:
0.002g2/Hz
from 10 to 2000 Hz
Sine:
2g from 5 to
500 Hz
20g peak
sawtooth,
11 ms duration
Up to 95% RH
Commercial grade cooled by forced air, for
use in benign environments and software
development applications. Optional
conformal coating
Extended
Temperature
(Level 2)
Operating:
-20 to
+65 with airflow of
300 feet/minute
Storage:
-50 to
+100
Random:
0.002g2/Hz
from 10 to 2000 Hz
Sine:
2g from 5 to
500 Hz
20g peak
sawtooth,
11 ms duration
Up to 95% RH with
varying temperature.
10 cycles,
240 hours
As Standard but conformally coated and
temperature characterized
Rugged Air-
cooled
(Level 3)
Operating:
-40 to
+75 with airflow of
600 feet/minute
Storage:
-50 to
+100
Random:
0.04g
2
/Hz
from 20 to 2000 Hz,
with a flat response
to 1000 Hz.
6 dB/Octave roll-off
from 1000 to 2000 Hz.
20g peak
sawtooth,
11 ms duration
Up to 95% RH with
varying temperature.
10 cycles,
240 hours
Wide temperature rugged, cooled by forced
air. Conformally coated for additional
protection
A.4.2 Conduction-cooled Boards
Table A-5 Conduction-cooled Environmental Specifications
Build Style
Temperature (°C)
Vibration
Shock
Humidity
Comments
Rugged
Conduction-
cooled (Level 4)
Operating:
-40 to
+75 at the thermal
interface
Storage:
-50 to
+100
Random:
0.1g
2
/Hz
from 15 to 2000 Hz
per MIL-STD-810E
Fig 514.4 – 8 for high
performance aircraft.
12g RMS
40g peak
sawtooth,
11 ms duration
Up to 95% RH with
varying temperature.
10 cycles,
240 hours
Designed for severe environment
applications with high levels of shock and
vibration, small space envelope and
restricted cooling supplies. Conformally-
coated as standard. Optional ESS
Rugged
Conduction-
cooled (Level 5)
Operating:
-40 to
+85 at the thermal
interface
Storage:
-50 to
+100
Random
:
0.1g
2
/Hz
from 15 to 2000 Hz
per MIL-STD-810E
Fig 514.4 – 8 for high
performance aircraft.
12g RMS
40g peak
sawtooth,
11 ms duration
Up to 95% RH with
varying temperature.
10 cycles,
240 hours
Designed for severe environment
applications with high levels of shock and
vibration, small space envelope and
restricted cooling supplies. Conformally-
coated as standard. Optional ESS
A.4.3 Spray-cooled Boards
Table A-6 Spray-cooled Environmental Specification
Build Style
Temperature (°C)
Vibration
Shock
Humidity
Comments
Spray-cooled
(Level 6)
Operating:
-40 to
+90 maximum
component case
tempeature
Storage:
-50 to
+100
Random
:
0.04g
2
/Hz
from 20 to 2000 Hz
with a flat response
to 1000 Hz.
6 dB/Octave roll-off
from 1000 to 2000 Hz
20g peak
sawtooth,
11 ms duration
Up to 95% RH with
varying temperature.
10 cycles,
240 hours
Conformally-coated as standard
