HONEYWELL Aerospace Electronic Systems Page 53
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5.4 Environmental Specifications
The following DO-160D categories will be used for the MARK III:
Temperature and Altitude (DO-160D Section 4.0)
Category A2, Partially controlled temperature, Pressurized to 15,000 feet
Operating temperature -15C TO +70C
Short time high operating temp +70C
Loss of cooling +40C
Ground Survival -55C to +85C
Altitude 15,000 feet
Decompression 55,000 feet
Overpressure -15,000 feet
Category F2, Non-controlled temperature, Non-pressurized, 55,000 feet maximum
Operating temperature -55C TO +70C
Short time high operating temp +70C
Loss of cooling +40C
Ground Survival -55C to +85C
Altitude 55,000 feet
Decompression N/A
Overpressure N/A
In-Flight Loss of Cooling (DO-160D Section 4.5.4)
Category W, 90 minutes minimum
The MARK III shall be able to operate with no forced cooling air at an ambient of +40° Celsius for a period of
90 minutes.
Temperature Variation (DO-160D Section 5.0)
Category B, Non-controlled temperature, Equipment mounted internal in aircraft
The maximum temperature variation rate is 5° Celsius per minute.
Humidity (DO-160D Section 6.0)
Category B, Severe Humidity environment
The unit shall withstand a 95% humidity, 10 day cycle.
Shock (DO-160D Section 7.0)
Category – B
Vibration (DO-160D Section 8.0)
Category – (UFF1)(SCLMY)
Explosion Proofness (DO-160D Section 9.0)
Category E
Non hermetically sealed equipment which meets the test requirements of environment I.
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