11.19 Intergrated Modular Avionics

Question 1

What does LRU stand for

Answer 1

Line Replaceable Unit

Question 2

What does LRM stand for

Answer 2

Line Replaceable Module

Question 3

What is the purpose of LRUs

Answer 3

They deal with data processing and storage

Question 4

What does IMA stand for

Answer 4

Integrated Modular Avionics

Question 5

What are IMA LRM called

Answer 5

(CPIOMs) Core Processing Input/output modules or (IOMs) Input Output modules

Question 6

What enables communication between different systems on the aircraft. What are the CPIOMs connected to

Answer 6

They are connected via full duplex cables to the Aircraft Data Communications Network (ADCN)

Question 7

What is AFDX

Answer 7

Avionics Full Duplex switched Ethernet

The connection between CPIOMs via duplex cables

Question 8

What are the main benefits of IMA

Answer 8

• They are off the shelf (COTS) components
• The same type of LRMs are interchangeable which reduces parts and maintenance costs
• Each LRM can be configured to provide services for more than one system application

Question 9

How many types of CPIOM are there

Answer 9

7 ranging from A-G

Question 10

Name the different types of CPIOM

Answer 10

CPIOM-A : Pneumatic and optional Air con
CPIOM-B : Air conditioning 
CPIOM-C : Cockpit and flight controls 
CPIOM-D : Data link
CPIOM-E : Energy 
CPIOM-F : Fuel
CPIOM-G : Landing Gear

Question 11

What is a CPIOM made up from

Answer 11

HARDWARE - A power supply board connected to 28v DC power

              - 2 input output boards
              - A CPU board ( Allows the CPIOM to communicate via AFDX with the ADCN 

SOFTWARE - CPIOM core software

                  - CPIOM config table software 
                  - Avionics application database

Question 12

What is different with IOMs over CIOMs

Answer 12

IOM acts as an Interface between conventional LRUs, which communicate with non AFDX data, to the ACDN which communicates with AFDX data

There is only 1 type of IOM (type A) they don’t host system applications

Question 13

How is a IOM constructed

Answer 13

HARDWARE - A power supply board connected to 28v DC

                  - Two input output boards 
                  - A CPU board 

SOFTWARE - IOM-A operational program software
- IOM-A configuration table software