13.20 Integrated Modular Avioics Flashcards
IMA
Puts all sub systems on a common platform which allows them to share resources which allows the designer to reduce avionic system weight size power an reoccurring cost
IMA
Replaces separate systems processors LRUs to a centralised processing unit it also helps reduce the maintenance required which all translates to more savings
IMA
Connects all modules (CPIOMS, IOMs & GPMs) to an aircraft data network it helps replace point to point cabling
Boeing common core system
Eliminates approx 100 LRUs
Airbus
Uses eight processing modules bussed together on a AFDX system
AFDX
Allows data transmission to multiple sources and dual data transmission both ways simultaneously
AFDX
Consists of end systems which send & receive data through virtual links via switches
Based on conventional Ethernet AFDX allows transmission rates of either 10 & Mbs over copper or fibre optic transmission
On a 2 Channel system for system integrity and redundancy
IMA
Data is sent via a virtual link
Each VL is allocated a dedicated bandwidth defined by the system Integrator.
VL ID is a 16 bit intégra value that follows the constant 32bit field
Total bandwidth cannot exceed maximum available bandwidth on the network, bidirectional communications must require the specification of complimentary VL
Media access control MAC
Address is a 6 byte 48bit address that is permanently burned into a network interface card
MAC address is also known as a Ethernet address hardware address or physical address
AFDX switch
Receives the VL from on emitter and routes it to the appropriate outputs based on the configuration table.
Hosting modules
Carry out the hosting and processing of the IMA system
Hardware boards
Power supply 28VDC
2 input output boards
CPU
Loadable software
Airbus CPIOM
CPIOM - A - pneumatic & optional air conditioning
CPIOM - B - air conditioning
CPIOM - C - cockpit & flight controls
CPIOM - D - data link applications
CPIOM - E - energy applications
CPIOM - F - fuel applications
CPIOM - G - gear applications
Boeing CCS system
16 GPMs
21 RDCs
4 Arinc 664 cabinet switches
6 Arinc 654 remote switches
GPM characteristics - hosts core software, I/O, health monitoring & non- volatile file storage
IMA component failures
Single I/O module loss on dual channel is a dispatchable item
Multiple non mirror I/O loss is NO GO
multiple mirror I/O loss is NO GO
Flight deck effect would be for the affected system not the host module failure, same applies to network failures is one channel is inop it is a go item but if multiple failures occur then it’s no go.
Combining technologies
Airbus - common remote data converter - collect, convert & échange data between thé ADCN & LRUs that do not have AFDX technology & mostly installed in the AVX bay.
Boeing - remote data converter - convert any no Arinc 664 signals into Arinc 664 & vice versa. (Analogue, discrètes, can buses etc)
