Technical data
Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 34
3 Computer Design Criteria
Revision History
Effectivity
Date - Modified By Description of the Updates App. Cfg.
29-NOV-99 Peter Bateman Initial release and entry into PVCS -001 -001
24-MAY-00 Susie Wright SCR 4942: General Document Cleanup. -003 -003
06-JUN-00 – Susie Wright Document only change – Deleted proprietary note from footer. -003 -003
3.0 Introduction
The EGPWS hardware and software are designed to fulfill specific criteria in the areas of resource utilization (via functional
partitioning), environmental conditions, reliability and safety, power utilization and reaction to power interrupts, operational
performance, mechanical standards, and software design. These criteria are described in detail in the following subsections.
3.1 Functional Partitioning
Partitioning EGPWS resources involves controlling access to system resources in such a way that one partition can not impact
the ability of another partition to complete it’s assignment. Thus if one function is locked up it will not impact the operation
of another function .
3.2 Environmental
The EGPWC conforms to the categories of RTCA/DO-160D “Environmental Conditions and Test Procedures for Airborne
Electronic, Electrical Equipment and Instruments” as identified in the applicable sections below.
3.2.1 Environmental, 965-1176-xxx, 965-1186-xxx, 965-1206-xxx, 965-1216-xxx.
ENVIRONMENTAL CONDITION CATEGORY
MAX/MIN
TEMPERATURE F2
High temperature, Non operating +85
0
C.
High temperature, operating +70
0
C.
Low temperature, Non operating -55
0
C.
Low temperature, operating -55
0
C.
IN-FLIGHT LOSS OF COOLING Z No cooling necessary
ALTITUDE F2
High altitude 55,000 feet
Decompression A2 55,000 feet
Overpressure A2 -15,000 feet
TEMPERATURE VARIATION B 5
0
C. per minute
HUMIDITY A 48 hours at 95% relative humidity,
38-50
0
C, non operating
OPERATIONAL SHOCK AND CRASH SAFETY
Operational shock B normal: 6 G’s, 11 msec sawtooth
low freq: 6g, 20msec sawtooth
CRASH SAFETY SHOCK
Impulse shock B 20 G’s, 11msec sawtooth
Sustained shock B 20 G’s
VIBRATION SMB Sinusoidal: 0.1”p-p 5-15Hz; 0.01”p-p @ 15-55Hz,
decaying to 0.0001”p-p @ 500Hz
Random: 1.48grms
EXPLOSION PROOFNESS E No test (certification of compliance)
WATERPROOFNESS X No test required