Subsection 15a Typical electronic/digital aircraft systems Flashcards
A basic IRS platform has?
3 accelerometer’s and 3 laser gyro’s
A BITE check for automatic performance and fault monitoring is carried out when?
Power up self test
A bulk erase facility in a CVR is interlocked to prevent?
Inadvertent erasure in flight
A central fault display system should be available through an easy accessible?
Multifunction control display unit
A central maintenance computer provides ground and flight monitoring and testing on?
An on board computer
A centralised monitoring computer system is used to test systems in flight and on the ground using?
A centralised on board control unit
A fault light appears on the IRS mode selector unit during the alignment sequence. The correct action is?
Select HDG/STS on the ISDU, observe the action code in the right alpha/numeric display
A FDR can obtain information from aircraft instruments provides?
There is adequate isolation
A flight data recorder should be capable of recording the last?
25 hrs of operation
An FMS has a total of how many databases?
2
A full operation system bite check will carry out an internal system test that ensures the system meets design requirements and is operational as well as checking the full system but will not?
Move the controls to their stops
A level B alert message in EICAS requires?
Timely action
A method used in modern aircraft for reporting in flight faults to an engineering and monitoring ground station is?
ACARS
A modern electromagnetic FDR for recording data could use?
A plastic tape coated in ferrite
A single failure of a fly by wire control surface computer will?
Not have any operational effect on the system
A single failure of a fly by wire system has?
No effect on aircraft operation
A strap down INS has a?
Solid state accelerometer system
ACARS is an acronym for?
Aircraft Communicating, Addressing and Reporting system
An ACARS system operates in the frequency range?
131.550 Mhz
ACARS is used to?
Download aircraft status reports
An EICAS message of level D provides?
Only message
An FDR fitted to a helicopter begins recording?
On engine start up
An FMS navigation database is updated?
Every 28 days
An FMS system besides controlling navigation, thrust and auto-nav also provides?
Dedicated status and warnings
An IN system requires data from?
The air data computer
AN Inertial navigation system ( INS/IRS ) computes distance from acceleration by?
Two successive integrations
An INS/IRS battery unit provides standby power when?
Airbourne and on the ground
An IRS has accelerometers and gyro’s fixed?
To the Airframe
An IRS has?
3 accelerometers
An IRS is only certified for alignment upto?
+78.25 and -78.25
An IRS laser gyro provides?
Detection of the rate of movement about an aircraft axis
An IRS system requires data for wind computation from?
Central air data computer
An IRU interface test is carried out?
Only on the ground
As a minimum requirement when must a cockpit recorder start recording?
Once the aircraft is ready to move under its own power
As a minimum requirement when must a cockpit voice recorder start recording?
On first engine start
Before an IRS can complete the alignment sequence the current position?
Must be entered
Before the aircraft is moved from the loading pier the pilot must insert?
The the latitude and longitude of the pier into the IRS
BITE for ground use only is?
Switched off on take-off
BITE test carried out on input sensors and actuators performs?
A performance test of the system
BITE tests are inhibited for?
Ground use during take-off
Brake temperature displayed on EFIS has different colours for?
Different temperatures
Control surface feedback is fed back to the ?
Flight control computer only
Data to flight data recorder can be taken from a communal data bus if?
Source isolation has been considered
EICAS provides engine parameters and?
System warnings only
Fly by wire high speed protection is to prevent?
Tuck under
Fly by wire systems in the fully active mode, the actuators will ?
Both be active
Fly by wire load alleviation function in turbulent conditions will result in?
Aileron and spoilers moving symmetrically upwards
Fly by wire control is achieved by?
Spoilers and ailerons
FMS CDU warnings are?
MSG,FAIL and OFST
FMS failure and warnings are displayed on?
EICAS
FMS system gives warning indications for?
Any flight phase
For an IRS system to pass the alignment system performance test, the latitude entered must be within?
Given limits of the latitude computed by the IRU
Gyro compassing is the term used for?
Self alignment in azimuth
Heading reference required to establish initial heading during alignment sequence comes from?
Earths rotation
How does the symbol generator detect a program error?
By looking at the odd parity without error
How many satellite signals are required to achieve precise 3D positioning?
4
HSI heading is valid if the heading flag is?
Out of view
If a display shows a red cross only, it is due to a?
Symbol generator failure
If a fly by wire actuator loses hydraulic power to the control surface will remain in the failure position but may move due to ?
Aerodynamic pressure
If additional multi-purpose flight attandants panels ( FAP’s) need to be fitted in a cabin system they are?
Daisy chain connected to the existing FAP’s
If an EFIS has 3 symbol generators what is the purpose of the 3rd symbol generator?
Standby
If a cabin chime indications ( pax call etc ) are inhibited, the inhibit function is reset when the aircraft transits from?
Flight phase to landing inhibit phase
If colour distortion appears around the edges of an EFIS display?
The CRT has become magnetised
If on a flightdeck EFIS system all the displays were missing one BIT of information, this is most likely to be?
The input sensor bus an display controller
If one EICAS CRT fails the remaining CRT will display?
Primary EICAS data
If one FMS fails in a dual FMS system, when the aircraft is on the ground then both CDU’s will display?
The menu page without prompt
If part of a display is lost on a CRT this could be due to?
An inoperative symbol generator or input sensor
In a flight director how are small deviations corrected?
Pilot input
In a flight management system ( FMS ) data is input manually to the computing system through?
The control and display unit
In a fly by wire system, if the pilot control input is derived from a side stick controller there is?
No control surface feedback to the sidestick
In a fly by wire system, what is meant by normal control law?
Control surfaces are controlled from primary computers
In a GPS system, satellites transmission identifies the satellite using?
Pseudo random code
In a GPS system the number of satellites required to achieve a 3D fix is?
4
In a MCDU the flight deck effect is any EICAS display or discrete annunciator to inform the flight crew of ?
An in-flight fault
In a typical glass cockpit EICAS provides?
The following engine parameters and system warnings only
In a typical EFIS system, 3 symbol generators are used to supply the?
Four displays with the correct signals
In an aircraft equiped with TCAS II and EFIS, RA pitch command is shown on?
The EADI and TA/RA traffic on the EHSI
In an EFIS display the lines, scales, indicator and synoptic are generated by?
Stroke pulse
In an EICAS level C messages are advisories and displayed in?
Amber or light blue
In an IFE system the supply of network data, interactive data. passenger service data and database information is provided to each seat from the area distribution box via?
Fibre optic or ethernet cable
In an IN system, the purpose of the stable platform is to ?
Prevent unwanted acceleration affecting the accelerometers
In EICAS electronic displays the system consists of two CRT displays, during normal flight the lower CRT is blank and the upper CRT displays?
Primary engine parameters
In modern aircraft the output from the clock is used to give GMT details to the?
Flight recorder and other systems
In the EICAS system when is the maintenance mode available?
Only available on the ground
In the passenger address system an announcement being made on the handset would be interupted if another announcement was initiated on?
The cockpit handset
In which of the following does TCAS II advise the pilot to make a maneouvre?
RA
Integrated pre-recorded announcement and music ( I-PRAM ) is stored on a compact flash card on the?
Flight attendant panels
Interactivity between cabin crew and the CID’s directors is provided by the?
Flight attendants panels ( FAP’s ) and mini-FAP’s
IRS accelerometers are mounted?
90 degrees to each other
IRS alignment takes up to 10 minutes and the present position can be entered at?
Any time during alignment
IRS laser ring gyro’s provide?
Rate of movement about an axis
Loudspeaker level adjustment for announcement and chimes from the cabin intercommunication data system ( CIDS ) can be adjusted?
Either on the ground or in flight
Marker beacon receivers have no control unit typically turns on?
When the avionics master switch is activated
MFD is the abbreviation for?
Multi Function Display
Modern aircraft with electronic displays would display information on the airframe and engine on which system?
ECAM
Most video used on IFE AVOD systems use which compression/encoding standard?
MPEG
Much of the cabin layout definition and other airline specific data such as cabin zoning, chime sequences and default audio levels are stored on?
The plugin cabin assignment module incorperated on the flight attendant panels
On a fly by wire system, what controls the stab trim?
ELAC and SEC
On a modern aircraft cabin system equiped with a CID’s the CID’s interfaces with the aircon system via the?
ADCN
On a modern aircraft when are BITE checks carried out?
Continuously when the system is in use
On what displays would attitude data be depicted?
PFD
Output from the cockpit acoustic devices are never interrupted by?
Other audio sources
PAX laptops are connected to the seat display units via?
RJ45 plug
Pitch control of a fly by wire system is achieved by ?
Stabilizer and elevator
Relationship of CMC’s to BITE systems is best described as?
CMC’s monitors the individual BITE systems and presents data
SID’s data stored in the FMC performance database is?
Standard instrument departures
TCAS general arrangements consist of?
TCAS computer unit, antennas and cockpit presentation
Testing of a CADC can be carried out?
On the ground only
The sterile cockpit switch, when activated indicates on the FAP’s and other cabin indicators that the flight crew do not wish to recieve communications other than matters concerning?
Safety critical events
The accelerometer output in an INS/IRS is integrated?
Twice to give distance
The accepted error from INS/IRS is?
3 miles/hour plus 3 miles
The aircraft clocks send signals to aircraft systems to?
Display and record GMT
The basic principle of radar is based upon the time delay between?
Outward and returning pulse
The BITE indicator on a DFDR shows yellow colour, this indicates?
Power is off or DFDR is at fault
The cabin and flight crew interphone system allows the communication via telephone between?
All attendant stations and between the attendant stations and the cockpit
The central processing function of the cabin intercommunications data system is contained?
Within the directors
The CMS uses?
The maintenance mode of operation
The command bars on an ADI relate to?
The path required
The common remote data concentrators collect, convert and exchange data between?
The ADCN and LRU’s that do not have AFDX technology
The compact mode in an EICAS is used to show maintenance pages when?
One display is inactive
The control of the speed or rate that the flight director command bars move can be controlled by?
Rate or velocity feedback
The difference between the right ADC and the left ADC is?
Encoded in the SDI field
The flight data recorder starts recording ?
After first engine start
The FMCS is updated periodically during flight by?
The pilot
The FMS can reset the error that builds up in the IRS by using?
VOR,DME,GPS,LOC
The FMS can update the IRS position outputs by using information from either?
GPS, DME, LOC and VOR
The FMS carries out a RHO/THETA navigation function, the purpose of this is to update the IRS system with?
An accurate position fix of latitude and longitude
The FMS databases consist of?
One performance and two navigation databases
The FMS is updated by an aircraft engineer updating the system either by?
A magnetic tape or floppy disc
The FMS operational database is fed with information on aircraft?
eight, cruise altitude and cost index before take off
The four display modes used by the ECAM system are?
Flight phase, advisory, failure related and manual
The frequency of a glideslope transmitter is?
328.6 to 335.4 Mhz
The functions of the cabin intercommunications data system are programmed, configured and controlled via?
The FAP’s
The general arrangement of GPS consists of 3 segments, the segments of a GPS system are?
User segment, control segment and space segment
The glideslope in an ILS provides?
Vertical references
The inputs and outputs of a CADC are?
Pitot/static in, altitude, CAS, mach and VS out
The landscape camera system can be deactivated remotely from the camera module from a?
Switch located on the exterior of the aircraft
The LH and RH cockpit displays will only be supplied from the same symbol generator when?
All other symbol generators have failed
The method of producing white lines for aircraft symbols, V/S scale etc on a EADI is by?
Stroke pulse
The minimum requirement for a cockpit voice recorder to begin operating is on?
Engine start up
The minimum requirement for an aeroplane CVR is from?
Engine start
The minimum requiremnt for an aeroplane CVR is prior to?
Beginning of the take-off roll
The minimum standards for aircraft instrumentation is set by?
ICAO
The movement of fly-by-wire control surfaces are?
Electrically controlled and hydraulically actuated
The Navigation database program of a flight management system would be held in?
ROM
The number of modes of operation in GPWS is?
Seven
The onboard information system ( OIS ) is hosted by?
The network server system
The operational database of the FMS may have to be modified in flight?
It cannot be modified in flight
The output of an INS can be fed to the?
Attitude indicators
The passenger address system distributes announcements from the cockpit and each attendant station through?
All assigned passenger speakers
The polled mode in an ACARS operates only when interrogated by?
The ground facility
The purpose of an Input/output module ( IOM ) is to convert the aircraft system data sent and received by LRU’s directly connected to them from?
Non AFDX into AFDX format and vica versa
The recording medium in an FDR is?
Magnetic tape coated with ferrite
The rising runway is positioned from information derived from?
The radio altimeter
The self test function on an EFIS system can be tested?
In air and ground
The service interphone system allows the communication via telephone between the ground crew, and cabin crew when?
The aircraft is on the ground
The third EFIS symbol generator is operated as standby to?
The #1 and #2 systems
The 3 accelerometers on a strapdown system are mounted?
90 degrees to each other
The various CPIOM’s used in an integrated modular avionics system differ in respect to their?
Input/output cards only
Typical displays on an EHSI are?
VOR, Heading and track
Typical IRS inputs and data bus transfer to the FMS are?
Vertical accelleration, true heading and roll angle over low speed ARINC 429
Using INS and aircraft flies?
Great circle route
Variations in light on EFIS displays are compensated for by an external light dependant resistor mounted in the flight deck compensating for all displays in a ?
Parallel to parallel format
Various indicating functions for the cabin systems are achieved via?
The FAP’s within the cabin
Weather radar information can be displayed on the EHSI in?
Map mode
What are the outputs from digital clocks used for ?
flight data acquisition unit, flight management computer and voice recorder
What are the outputs of a digital ADC?
TAS, MACH, ALTITUDE, TAT and SAT
What are the shapes of traffic shown on a TCAS display?
White diamonds, red squares and amber circles
What displays would normally indicate engine instrumentation?
EICAS
What does the CADC feed?
Cabin pressure controller, machmeter and altimeter
What is the highest priority on an ECAM display?
Failure
What information is required before completion of the alignment of INS?
Aircraft present position
What information would normally be displayed on an EICAS system?
Engine instruments
What is normally displayed on a PFD?
Attitude data
What is primary mode of navigation on a modern aeroplane?
Only IRS
What is the approximate earth rate?
15 degrees per hour
What is the minimum requirement for a CVR to start recording?
When the aircraft is capable of moving under its own power
What is the minimum requirement for a CVR to operate?
Before take off
What must be entered into the IRS before the aircraft can be moved?
Present position
What warnings can an FMS provide?
Discrete warnings
When does a BITE test record intermittent faults?
Latch immediately
When does the flight data recorder start recording?
On first engine start
When more than one directors is fitted to fulfill the role of controllers within a cabin intercommunications data system ( CID’s ) one of the directors in active and the other in?
Standby
When performing a test on electronic displays using BITE signal generator injects a test signal into the display and the word?
Test appears on the screen
When testing a diode with a test set, what voltage drop would be typical?
0.3 to 0.7 volts
When testing an EGT probe it must be?
Soaked and ambient temperature allowance taken into consideration
Where are the digital flight data recorder outputs supplied to?
There are no outputs
Where can the ECAM be displayed on a modern airliner?
On any of the displays
Where can the EFIS be displayed in a modern airliner?
On any of the displays
Where do the inputs from a DADC go?
EADI
Which BITE test is used for automatic passive monitoring and detection of LRU failures?
Continuous testing
Which device in an EICAS system performs the symbols generator function?
EICAS computer
Which major component of an ECAM system manages system operation and interfaces input signals from sensors to display units?
Flight warning computer ( FWC )
Which systems does a modern ADC give information to?
Flight control computer, air data instruments and engine systems
Wi-fi provision to passengers is provided via satellite link while?
Not over land
With EICAS an engine overheat will activate a?
level B caution
XTC ( crosstrack ) is the perpendicular distance from?
The desired track
