Final Review

Question 1

List some advantages in switching from analog engine instruments to an EICAS system

Answer 1

Less operating costs (paying wages)
Combined instruments into one display
Reduced pilot work load

Question 2

What does the acronym EICAS stand for?

Answer 2

EICAS- Engine Indicating and Crew Alerting System

Question 3

What are the main components that make up an EICAS system?

Answer 3

2 DU
2 dedicated computers
Display select panel (DSP)
Standby indicator
Maintenance Control Panel (MCP)
dedicated warning lights

Question 4

When is the standby indicator used in an EICAS system?

Answer 4

In event of a dual display, dual computer or catastrophic wiring failure a standby indicator is
provided in the system.

Question 5

Describe the following EICAS modes.

Answer 5

Operational Mode - Shows primary / secondary engine parameters
Status mode - Planes readiness for dispatch
Maintenance Mode - different parameters monitored by EICAS

Question 6

Describe where the following colors are used on an EICAS Display.

Answer 6

White - All good
Red - Warning
Amber - Caution / advisory
Blue - During EICAS Test

Question 7

Rose, Arc and Map are display formats for what type of instrument?

Answer 7

EHSI

Question 8

What will the EHSI or EADI display in the event of a failure of displayed information?

Answer 8

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

Question 9

Describe the purpose of the following EFIS system components

Answer 9

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

Question 10

What common piece of equipment is used to access information in the CMCS, ACARS and FMS
system?

Answer 10

The Control Display Unit (CDU)

Question 11

What aircraft system can perform ground and flight testing of virtually all aircraft systems and
has a better memory than most BITE systems?

Answer 11

Centralized Maintenance Computer System. (CMCS)

Question 12

What was the CMCS system primarily designed to do?

Answer 12

Isolate faults and help test the systems post repair

Question 13

What is an FMS system and what does it provide?

Answer 13

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

Question 14

How does the FMS provide control of the Auto throttle system?

Answer 14

Through the ECC’s (Electronic Engine Control)

Question 15

What safety precautions must always be observed when performing pitot/static testing on an
aircraft?

Answer 15

• 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

Question 16

What inputs does stall warning computer generally need to compute an aircraft stall?

Answer 16

airspeed from the air data computers to compute when it is necessary to warn the pilot.

Question 17

What does ESDS stand for?

Answer 17

Electrostatic Discharge Sensitive

Question 18

What type of electronic equipment is very vulnerable to ESDS?

Answer 18

Any Equipment which contains microelectronic components.

Question 19

How are static charges created?

Answer 19

friction between different materials.

Question 20

How small of a voltage discharge can cause damage to an ESDS component?

Answer 20

30 V

Question 21

Describe the procedure for the removal of ESDS printed circuit boards

Answer 21

• 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

Question 22

Describe the installation procedure for metal encased ESDS LRU’s.

Answer 22

• Remove power
• Dont touch connector pins / conductors
• Remove dust caps
• Place in unit and secure

Question 23

EICAS

Answer 23

Engine Indicating and crew alerting system

Question 24

EHSI

Answer 24

Electronic Horizontal Situation Indicator

Question 25

DPU

Answer 25

Display Unit

Question 26

DSP

Answer 26

Display select panel

Question 27

EFIS

Answer 27

Electronic Flight info system

Question 28

FMS

Answer 28

Flight management system

Question 29

Types of displays in glass cockpit

Answer 29

CRT or LCD

Question 30

Purpose of basic computer

Answer 30

Assemble, store, process, output data

Question 31

ARINC 429 speeds, signal type, voltage for 1 and 0

Answer 31

• Low speed (12.5 to 14.5 kbps)
• High speed (100kbps)
• Digital
• -10V, +10V

Question 32

Air data test procedure steps

Answer 32

• 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

Question 33

EHSI display formats

Answer 33

ARC
Rose
Map

Question 34

How is air data sensed

Answer 34

Pitot
Static
Temperature

Question 35

EICAS modes, and message prioriity

Answer 35

Operational
Status
Maintenance

Alert
Status
Maintenance

Question 36

What is displayed on the MFD

Answer 36

Weather radar
Maps
Checklists
Maintenance data

Question 37

CMC can perform what kind of tests?

Answer 37

BITE tests

Question 38

2 types of hardware for computers

Answer 38

Analog / digital