Final Review Flashcards
List some advantages in switching from analog engine instruments to an EICAS system
Less operating costs (paying wages)
Combined instruments into one display
Reduced pilot work load
What does the acronym EICAS stand for?
EICAS- Engine Indicating and Crew Alerting System
What are the main components that make up an EICAS system?
2 DU 2 dedicated computers Display select panel (DSP) Standby indicator Maintenance Control Panel (MCP) dedicated warning lights
When is the standby indicator used in an EICAS system?
In event of a dual display, dual computer or catastrophic wiring failure a standby indicator is
provided in the system.
Describe the following EICAS modes.
Operational Mode - Shows primary / secondary engine parameters
Status mode - Planes readiness for dispatch
Maintenance Mode - different parameters monitored by EICAS
Describe where the following colors are used on an EICAS Display.
White - All good
Red - Warning
Amber - Caution / advisory
Blue - During EICAS Test
Rose, Arc and Map are display formats for what type of instrument?
EHSI
What will the EHSI or EADI display in the event of a failure of displayed information?
The unit will cross out or remove the associated information and then display a red flag
somewhere on the display face. For example if the Localizer were to fail the display would show a flag that
says LOC
Describe the purpose of the following EFIS system components
DPU- Receives inputs from various aircraft systems and produce deflection and video signals needed by the displays.
MPU- video signals needed by the MFD
DCP- Provides dimming for the EFDs
MFD- MFD provides weather radar data, navigational maps, checklists and maintenance data
What common piece of equipment is used to access information in the CMCS, ACARS and FMS
system?
The Control Display Unit (CDU)
What aircraft system can perform ground and flight testing of virtually all aircraft systems and
has a better memory than most BITE systems?
Centralized Maintenance Computer System. (CMCS)
What was the CMCS system primarily designed to do?
Isolate faults and help test the systems post repair
What is an FMS system and what does it provide?
This is a computer based system designed and implemented to reduce pilot workload. The FMS provides; • Automatic radio tuning • Lateral and vertical navigation • Thrust management • Flight plan maps • Data storage
How does the FMS provide control of the Auto throttle system?
Through the ECC’s (Electronic Engine Control)
What safety precautions must always be observed when performing pitot/static testing on an
aircraft?
- Ensure ehating elements are off and CBs pulled
- ALways ensure output on testbox is connected to correct input
- Do not switch selector valve or remove lines with pressure applied
- Always watch instruments during test to not exceed max’s and anomalies
- Read all test box instructions before testing
- Always flag all hoses, equip on ports and CBs pulled
What inputs does stall warning computer generally need to compute an aircraft stall?
airspeed from the air data computers to compute when it is necessary to warn the pilot.
What does ESDS stand for?
Electrostatic Discharge Sensitive
What type of electronic equipment is very vulnerable to ESDS?
Any Equipment which contains microelectronic components.
How are static charges created?
friction between different materials.
How small of a voltage discharge can cause damage to an ESDS component?
30 V
Describe the procedure for the removal of ESDS printed circuit boards
- Remove power
- Connect wrist strap
- Gain access to PCB
- Remove PCB
- Immediately insert PCB into anti static bag
- Close and secure unit
- Disconnect wrist strap
- Place PCB into rigid container
Describe the installation procedure for metal encased ESDS LRU’s.
- Remove power
- Dont touch connector pins / conductors
- Remove dust caps
- Place in unit and secure
EICAS
Engine Indicating and crew alerting system
EHSI
Electronic Horizontal Situation Indicator
DPU
Display Unit
DSP
Display select panel
EFIS
Electronic Flight info system
FMS
Flight management system
Types of displays in glass cockpit
CRT or LCD
Purpose of basic computer
Assemble, store, process, output data
ARINC 429 speeds, signal type, voltage for 1 and 0
- Low speed (12.5 to 14.5 kbps)
- High speed (100kbps)
- Digital
- -10V, +10V
Air data test procedure steps
- Ensure heat is off and CBs pulled
- Visual inspection of pitot tubes
- Hook up test equipment
- Flag CBs, ports, etc.
- Begin testing, slowly, following Standard 571 Appendix B
- Release all pressure slowly back to normal
- Dual inspectioon and sign off
EHSI display formats
ARC
Rose
Map
How is air data sensed
Pitot
Static
Temperature
EICAS modes, and message prioriity
Operational
Status
Maintenance
Alert
Status
Maintenance
What is displayed on the MFD
Weather radar
Maps
Checklists
Maintenance data
CMC can perform what kind of tests?
BITE tests
2 types of hardware for computers
Analog / digital
