Civil Engineering Reference
In-Depth Information
Fig. 5.12
ARINC 600 and EN3646 connector type
Signal quality estimation by simulation and mock-up are run in order to antici-
pate potential risks for system design.
At node termination, the connector type is a regular avionics one: ARINC 600 or
circular EN3646 type as shown Fig.
5.12
.
5.3.3
DAL, Safety, Certification
DAL (stands for Design Assurance Level from A to E. DO178B) classifies effects
of a functional failure on aircraft safety. Safety analysis is run for all systems and
loss of equipment/component (wire, etc.) is classified. Redundancies are built up
to reach the system safety requirement. The loss effects classification is as follows:
• E—no safety effect,
• D—minor,
• C—major,
• B—hazardous and
• A—catastrophic.
A loss of a CAN network is no more than major. In specific high critical networks,
we have up to three CAN wires and equipment redundancies.
5.3.3.1
Certification
The US Federal Aviation Administration (FAA) and the European Aviation Safety
Agency (EASA) are two independent administrations that allow an aircraft to trans-
port passengers. Numerous CRIs (Certification Review Items) will assume that
CAN is related to CRI-F40 for A380 and the objectives are:
1. To ensure that the bus perform its intended function under the most demanding
conditions and
2. To evaluate effect of abnormal behaviour and ensure the safety consequence.
