Blind Flight problems were overcome by the introduc
Directional Gyro gives:
Horizon Gyro gives
According to CAA requirement for the design of airc
'Flight instruments'' should be
Instruments that aid in controlling the in-flight attitude of the aircraft
and gives a picture of the aircrafts flight condition are known as:
Turn and Bank Indicator
The four basic T indicators are:
Airspeed, Altimeter, Pitch & Roll Attitude and HIS.
HSI, Airspeed, Pitch & Roll Attitude and VSI.
HSI, VSI, RMI and ADI.
Electronic Attitude Director shows
Glide Scope and Localiser deviation.
Waypoints, Airports and navigation Aids
EADI Display also shows:
Warning messages and status messages.
Distance to Go.
Electronic Horizontal Situation Indicator displays
Slip, Pitch Roll information
ILS Steering Information
Engine information displayed on:
ND or PFD
Flight Director Information.
Aircraft's position and heading in relation to navigation
Aircraft Attitude and Horizon
Displays fault in the event of a fault condition
Displays Pictures, diagrams of the system.
Displays information on both displays in normal operation
Displays Engine Data Continuously
Has a lower screen that is blank.
Displays engine data in the event of a fault condition.
Video signal processing to drive the displays are
carried out by
In a large commercial aircraft, how many symbol generators are there
Comparators are used to detect
Difference in signals from two sources.
Difference in signals from two receivers
Division of signals from two sources
In the modern EFIS systems, failure of data signals are displayed on each
EADI and EHSI by:
A CRT contains how many electron guns?
CRT electron guns contain colours
Red, Amber, Green
Red, Green, Blue
Red, Amber, Blue
Mixing the 3 electron guns colours will produce:
Magenta, Cyan, Yellow & White.
Purple, Yellow, Blue & White
Amber, White, Magenta & Green
Two methods for painting information onto the screen
Raster and stroke
Flicker-free refreshing rate for stroke is:
80 times a second.
90 times a second.
70 times a second
Flicker-free refreshing rate for raster is:
50 times per second
40 times per second
30 times per second
A BITE check for automatic performance and fault monitoring is carried
For in-flight monitoring
To check the performance of the LRU
To deflect the beam of a CRT horizontally, coils are placed on the neck of the tube
Top and bottom
One on the side, one at the bottom
Left and right
What is the equivalent of this gate
= (NOT-A + NOT-B).
= (A + B)NOT
ACARS is an acronym for
Aircraft Communicating Addressing and Reporting System.
Airborne Communicating Addressing and Reporting System
ARINC Communicating Addressing and Reporting System
If part of a display is lost on a CRT, this could be due to:
An inoperative symbol generator or control panel
An inoperative symbol generator or input sensor
Loss of power to the CRT
Two connected fibre optic cable ends are parallel but not quite touching. This is called:
End to end coupling
End fire coupling
Fly By Wire systems in the fully active mode, the actuators will
Both be active
Both be in damping mode, awaiting control inputs
One in active mode, one in damping mode
Electronic Centralised Aircraft Monitoring System:
Performs in-flight and ground tests of aircraft systems by carrying
out a BITE interrogation
Performs in-flight BITE interrogation only
Give red warnings and amber cautions to display system status
The T/R of ARINC 629 is
Encoder / decoder
Multiplex / Demultiplex
The arithmetic logic unit (ALU) in a central processor unit (CPU) carries out:
Addition, subtraction, multiplication and division
Computations as instructed
Timing and synchronisation.
In a MU, how is parallel converted to serial
By way of a shift register
By way of an encoder
By way of a demultiplexer
What is the advantage of an ILD over an LED when used as a light source in fibre optics
Lower frequency range
Before removing an assembly from an aircraft, with regards to HIRF, you must first ensure that there is minimum current flow between
The assembly and the aircraft
You and the assembly
You and the aircraft.
Before fitting a Printed Circuit Board you should
Resistance between skin and strap end plug is less than 10 megohms
Resistance between skin and strap end plug is more than 1 megohms
Resistance between strap and strap end plug is less than 1 megohms
ARINC 429 SDI word format is at bits
When testing EGT probe
It must be soaked and ambient temperature allowance taken into consideration
Not necessarily soaked but ambient temperature must be taken into consideration
If it’s not soaked, a minimum temperature of 20 degrees C taken as OAT
In a single mode fibreoptic cable
Several waves travel down the cable
The diameter of the cable is dependent on the wavelength of the light used
The distortion of the signal is dependent on the le
ngth of cable
The control of the speed or rate that the flight director command bars move can be controlled by
Rate or velocity feedback
In fibreoptic cable, signals are separated by
Active optic filter
Low pass filter
Passive optic filter
Common aircraft fibreoptics use:
Modulating intensity on direct read
Modulating intensity on indirect read
Modulating frequency on direct read
If on a flight deck EFIS system, all the displays were missing one bit of information. This is most likely to be
The input sensor bus and display controller
The symbol generator and display
The display controller and symbol generator
A DAC uses a precision amplifier to
Ensure the output voltages remain accurate.
Compensates for the variation of the feedback resistor due to temperature
Ensure the input remains accurate
What is a (Level A) alert message
Warning require immediate action
Cautions requiring immediate crew awareness
Advisories require crew awareness
A device which allows the input of 1
digital signals and produce
The logic gates shown in the figure below has input A=1 and B=1 the output is: f = A+B > "f equals A OR B".
Either Logic 1 or Logic 0
A fiber optic system normally uses ............... as a high source
A PIN diode of Photodiode
A Laser diode or LED
A strobe light.
Which of the following is an advantage of fiber optics?
Increased signal attenuation
Immunity to noise
functionality in the instrument system, the artificial horizon is subsequently:
Electronic Flight Instrument System
Horizontal Situation Indicator
Attitude Direction Indicator
Gyroscopes are used in
Inertial Navigation Systems
Remove Printed Circuit Board “PCB” you should firs
t check the:
between strap and ground is less than 1MOHM
between strap and strap and plug is less than 1MW
Check Maintenance Manual for any special instruction
Databas classified .... Both direction
Ground and airplane using
Very high frequency
Narrow viewing has disadvantages in
Failure condition of safety flight is
Hazardous sever failure related to
Which memory erased data after disconnected from system