Environmental Specifications - Honeywell Mark III Technical Overview

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
Short time high operating temp
Loss of cooling
Ground Survival
Altitude
Decompression
Overpressure
Category F2, Non-controlled temperature, Non-pressurized, 55,000 feet maximum
Operating temperature
Short time high operating temp
Loss of cooling
Ground Survival
Altitude
Decompression
Overpressure
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.
HONEYWELL Aerospace Electronic Systems
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-15C TO +70C
+70C
+40C
-55C to +85C
15,000 feet
55,000 feet
-15,000 feet
-55C TO +70C
+70C
+40C
-55C to +85C
55,000 feet
N/A
N/A
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