Mod 5 Flashcards
EIDS stands for?
A- Electronic Instrument Data System
B- Electronic Instrument Display System
C- Electronic Identification Data System
EIDS -
B- Electronic Instrument Data System
Advantages of EIDS
Variability and Variety
Coloured Displays
How are parameters fed via EIDS?
3 ways
Via Display Data Buses to CPU Controlled CRT or LCD
Via Digital Data buses to a printer for a hard copy printout
In digital form to a radio transmitter, which sends Data to ground
How are EIDS arranged?
A- Basic I
B- Basic H
C- Basic T
C- Basic T
How are the EIDS monitors brightness controlled?
A- Control Knobs and brightness of sunlight
B- They can not be altered
C- Overhead push switches
A- Control Knobs and brightness of sunlight
What is the disadvantage of EIDS compared to Analogue systems?
A- They are harder to understand
B-Difficult to read indications in bright sunlight
C- Can’t contain as much information
B- Difficult to read monitors in bright sunlight
What does ECAM stand for?
Electronic Centralised Aircraft Monitoring
What does FDRS stand for?
Flight Data Recording System
What does CMS stand for?
Central Maintenance System
What does ACMS stand for?
Aircraft Condition Monitoring System
Minor Troubleshooting uses what and how?
ECAM and CMS through MCDU’s and generated reports (printed or ACARS downlinked)
In depth troubleshooting uses what and how?
Uses ACMS and CMS through MCDU and printed reports
Long term maintenance uses what and how?
ACMS and FDRS through printed, ACARS downlinked and downloaded reports or tapes
MSD stands for what and is located where?
Most Significant Digit located far left
LSD stands for what and is located where?
Least Significant Digit located far right
Positional Notation labels its digits as?
Value or Weight
What is the point called in a Binary Fraction?
Binary Point
How does the DFDAU recognise its location on different Aircraft types?
Decodes Ident discretes
How many Discretes on an FDAU?
18
What is the EEC Programming Plug also known as?
Data Entry Plug
What is the EEC Plug part of?
The Engine
How is the EEC Plug pin programmed?
Binary specific to an individual engine serial number
What is the EEC Plug required for?
ACMS printed reports
What is the largest Digit of a numbering system?
One less than the base
What does FADEC use to assist with Troubleshooting?
Maintenance Data Storage and retrieval system
When does the FADEC system store when engines are running?
In flight faults and flight conditions together with environmental conditions
When is the FADEC Maintenance system activated on ground?
Selection on the maintenance panel of the BITE display mode
What’s displayed on the ECAM when BITE display mode is selected?
Maintenance words encoded from non-volatile memory and the delta corresponding memory
What is Binary Coded Decimal most convenient for?
Computers
What does ALU stand for?
Arithmetic Logic Unit
What form of inputs does an ALU require?
A-Analogue
B-Digital
B-Digital
Three most common Logic Circuits?
Inverter
AND
OR
What is an Inverter also know as?
Boolean Complement
When will a Diode Logic Minimum Circuit produce a positive Logic?
When all of the Logics are positive
When will a Diode Logic Maximum Circuit produce a positive Logic?
If one or more of the inputs is Positive Logic
What does DTL stand for?
Diode Transistor Logic
What are the 2 types of DTL?
NAND and NOR
What does RTL stand for?
Resistor Transistor Logic
What are the 2 types of RTL?
NAND and NOR
What does ECL stand for?
Emitter Coupled Logic
What does TTL technology use?
Transistors at the inputs with several emitters
Why are there diodes at the inputs of TTL
To protect the inputs from excessive voltages
Where are TTL’s only available?
Integrated Circuits (IC’s)
What are WIRED AND and WIRED OR also called?
DOT AND and DOT OR
What happens if you switch the outputs in Parallel in a Logic Circuit?
It destroys the electronic devices
How can you switch the output parallel on a WIRED-AND or WIRED-OR circuit?
If you connect it in an OPEN COLLECTOR arrangement
When is parallel switching called WIRED-AND?
When the 0 signal is dominant (TTL)
When is Parallel switching called WIRED-OR?
When 1 signal is dominant (ECL)
What rule are codes determined by?
Determined Input combinations will be converted to determined output combinations
What is an Assessable Code?
If every single Bit has a value
What is an Unassessable code?
Code that bits do not have a certain value. The Bit pattern itself gives the data word
Give examples of Assessable codes
Symmetric 8421
Unsymmetrical 2421
Aiken Code
Give an example of an Unassessable code
3XS Code
What is a disadvantage of 8421 Code?
All bits could be 0 which means you can’t see any defects
What numbers do the Aiken Code use?
First 5 (0-4) and last 5 (11-15) options of binary code
What codewords do the 3XS code use?
Numbers 3-12 from the binary code
What is an advantage of 3XS Code?
Under no circumstances are all bits 0 or 1
What is a single step code?
One that from one decimal step to the next, only one binary bit changes its value
Why do we use single step code?
In case of mechanical inaccuracies, no faulty information can be generated when switching from one number to another
Give examples of single step code
Gray Code
Libaw-Craig Code
Gilham Code
What is Gilham code used for?
ATC systems on old Aircraft
What is the altitude encoded in on the Gilham Code?
100 FT
Where is the Gilham Code generated?
Altimeter or analogue ADC
What is ASCII Code?
American Standard Code for Information Interchange
Give examples of ASCII code
ISO Alphabet No.5
CCIT Code 5
7 Bit Code DIN 66003
What is ASCII Code used for?
Used to transfer Alpha-Numeric Data as words, text messages and processor commands
Name 3 code converters
Encoder
Converter
Decoder
What does an Encoder do?
Converts Input message with a greater number of bits to an output message with a lower number of bits (Increasing the base)
What does a Converter do?
A converter code converts one code to another with identical number of bits
What does a Decoder do?
A decoder converts an input with a lower number of bits to an output with a larger number of bits (decreasing the base number)
What does a Comparator do?
Compares two words to check if they are Equal
What does a comparator do if words are not equal?
Find out which word value is higher than the other
What does a comparator depend on to compare 2 codes?
They must both be Assessable and be the same code type
What is a priority Circuit used for?
Used to rank different inputs based on priority
What can happen during transportation of digital data information?
Can be changed by external influences between the receiver and transmitter
How can you identify if a fault has been induced into digital data information between a receive and transceiver?
Parity generator
What can be used to set a Fault status at the receiver end?
Parity Controller
What is a Karnaugh-Veitch Diagram used for?
To optimise digital circuitry and the amount of necessary gates
What are discrete inputs?
Open/Ground or Open/28V
What does a Multiplexer do?
Device which combines several inputs into a single output
What is a demultiplexer?
A device which takes data from one source and distributes it to several outputs
What is the output of a multiplexer and demultiplexer dependant on?
The Address lines
What is the previous state of a Storage device called?
Internal State
What is ‘t=tm’?
Point where input variables are changed but internal states and output state are unchanged
What is ‘t=tm+1’?
New input states change the internal states and the output state
What are the 2 types of memory?
Static and Temporary
What is static memory also known as?
Bistable sweep stage
What is temporary memory also known as?
Mono-astable sweep stage
What does Static memory (bistable sweep stages) depend on?
Input stages and History of input stages
What does Temporary memory (mono-astable memory) depend on?
Input state, history of input state and time
What type of arrangement is a flip flop?
Storage Device - Bistable sweep stage (static memory)
What properties must a storage device have?
Store, set and reset(clear)
What’s the condition where both outputs of a SR Flip-Flop are 1 at the same time?
Irregular state (forbidden or restricted)
