ALM 388 - Unit III Exam Questions with Correct Answers Latest Update 2025/2026
What are self-contained diagnostic systems found on modern aircraft often called? - Answers
BITE
The B-757 contains several systems that employ BITE. Which of the following is true of this type
of BITE? - Answers The BITE data is accessed through a given LRU using an LED display.
The Boeing 757 and 767 incorporate a Maintenance Control Display Unit (MCDU) to Monitor and
Test various systems. Which of the following statements is/are true concerning the MCDU? -
Answers All of the above
The BITS mode fault diagnostics program is found on which of the following systems? -
Answers Corporate aircraft that employs Collins Electronic Flight Instrument Systems (EFIS)
Where is the fault data accessed for the B-747-400 Central Maintenance Computer System? -
Answers The fault data is accessed through one of four printers
What system is used on the B-747-400 for fault monitoring and isolation? - Answers Central
Maintenance Computer System
How many Central Maintenance Computers (CMCs) are used in the B-747-400 CMC System? -
Answers Two
Which of the following statements is true concerning the Line Select Keys (LSK) found on the B-
747-400? - Answers The LSKs are used to select items for display or activate functions available
on the CDU
What are the two basic formats presented under the present faults function of the B-747-400
CMCs? - Answers Present leg faults and CMC messages
On the B-747-400 Central Maintenance Computer System the Term Present Leg is defined as
which of the following? - Answers The Present Leg is defined as the elapsed time between Forst
engine start and last engine shut down.
A flight deck effect can be defined as which of the following? - Answers Any EICAS (or ECAM)
Message or Parameter exceedance, any primary flight display (PFD) flag, or any navigational
display (ND) flag
What manual is used in conjunction with CMCS message data for troubleshooting the B-747-
400? - Answers Fault Isolation Manual
What function of the software program is used by the Boeing 747-400 CMCs to help eliminate
nuisance messages? - Answers Flight phase screening
The B-747-400 Central Maintenance Computers Van record how many different flight phases? -
Answers 14
, What parameter is recorded by the CMC to indicate the airplane's configuration at the time a
system fails? - Answers The flight phase when the fault occurred
Generally speaking, what is a nuisance message displayed by an aircraft's central maintenance
system? - Answers Any fault data or flight deck effect that is not caused by an actual fault.
How many flight legs can be stored in the B-747-400 CMCs fault history? - Answers 99
On the B-747-400, the EICAS Maintenance Pages present which of the following types of data? -
Answers Real time data, auto event data, manual event data
The confidence tests function of the B-747-400 CMCS is often used for which of the following? -
Answers Preflight testing of three vital aircraft systems.
Which of the following is a section of a typical Fault Isolation Manual that would be used during
fault isolation? - Answers All of the above
If a technician is unable to repair an aircraft system, what manual must be referenced to
determine if the aircraft can return to service? - Answers The aircraft's minimum equipment list
What function of the B-747-400 CMCs is used to access real time ARINC 429 data in a 32-bit
format? - Answers Input monitoring
What is the name for the advanced diagnostics and fault isolation system used on Airbus
aircraft? - Answers Centralized Fault Display System
What system can be used to transmit information directly from the aircraft's centralized fault
computers to the airlines ground facilities? - Answers The Airborne Communication Addressing
and Reporting System (ACARS)
On the A-320 how many Centralized Fault Display Interface Units (CFDIU) are employed in the
Centralized Fault Display System (CFDS)? - Answers 1
Concerning the A-320, which class of failure will have the most serious consequences on
aircraft performance? - Answers Class I
On the A-320, what two CFDs reports can be accessed during flight? - Answers Current leg
reports and current leg ECAM reports
Which LRU is used by the A-320 to access fault data from the CFDS? - Answers The
Multipurpose Control and Display Unit (MCDU)
The CFDS avionics Status data is available on which of the following aircraft? - Answers A-320
On the A-320, what level of troubleshooting involves an in-depth study of the failed system
through access of the binary or hexadecimal fault code data? - Answers Level 3
What are self-contained diagnostic systems found on modern aircraft often called? - Answers
BITE
The B-757 contains several systems that employ BITE. Which of the following is true of this type
of BITE? - Answers The BITE data is accessed through a given LRU using an LED display.
The Boeing 757 and 767 incorporate a Maintenance Control Display Unit (MCDU) to Monitor and
Test various systems. Which of the following statements is/are true concerning the MCDU? -
Answers All of the above
The BITS mode fault diagnostics program is found on which of the following systems? -
Answers Corporate aircraft that employs Collins Electronic Flight Instrument Systems (EFIS)
Where is the fault data accessed for the B-747-400 Central Maintenance Computer System? -
Answers The fault data is accessed through one of four printers
What system is used on the B-747-400 for fault monitoring and isolation? - Answers Central
Maintenance Computer System
How many Central Maintenance Computers (CMCs) are used in the B-747-400 CMC System? -
Answers Two
Which of the following statements is true concerning the Line Select Keys (LSK) found on the B-
747-400? - Answers The LSKs are used to select items for display or activate functions available
on the CDU
What are the two basic formats presented under the present faults function of the B-747-400
CMCs? - Answers Present leg faults and CMC messages
On the B-747-400 Central Maintenance Computer System the Term Present Leg is defined as
which of the following? - Answers The Present Leg is defined as the elapsed time between Forst
engine start and last engine shut down.
A flight deck effect can be defined as which of the following? - Answers Any EICAS (or ECAM)
Message or Parameter exceedance, any primary flight display (PFD) flag, or any navigational
display (ND) flag
What manual is used in conjunction with CMCS message data for troubleshooting the B-747-
400? - Answers Fault Isolation Manual
What function of the software program is used by the Boeing 747-400 CMCs to help eliminate
nuisance messages? - Answers Flight phase screening
The B-747-400 Central Maintenance Computers Van record how many different flight phases? -
Answers 14
, What parameter is recorded by the CMC to indicate the airplane's configuration at the time a
system fails? - Answers The flight phase when the fault occurred
Generally speaking, what is a nuisance message displayed by an aircraft's central maintenance
system? - Answers Any fault data or flight deck effect that is not caused by an actual fault.
How many flight legs can be stored in the B-747-400 CMCs fault history? - Answers 99
On the B-747-400, the EICAS Maintenance Pages present which of the following types of data? -
Answers Real time data, auto event data, manual event data
The confidence tests function of the B-747-400 CMCS is often used for which of the following? -
Answers Preflight testing of three vital aircraft systems.
Which of the following is a section of a typical Fault Isolation Manual that would be used during
fault isolation? - Answers All of the above
If a technician is unable to repair an aircraft system, what manual must be referenced to
determine if the aircraft can return to service? - Answers The aircraft's minimum equipment list
What function of the B-747-400 CMCs is used to access real time ARINC 429 data in a 32-bit
format? - Answers Input monitoring
What is the name for the advanced diagnostics and fault isolation system used on Airbus
aircraft? - Answers Centralized Fault Display System
What system can be used to transmit information directly from the aircraft's centralized fault
computers to the airlines ground facilities? - Answers The Airborne Communication Addressing
and Reporting System (ACARS)
On the A-320 how many Centralized Fault Display Interface Units (CFDIU) are employed in the
Centralized Fault Display System (CFDS)? - Answers 1
Concerning the A-320, which class of failure will have the most serious consequences on
aircraft performance? - Answers Class I
On the A-320, what two CFDs reports can be accessed during flight? - Answers Current leg
reports and current leg ECAM reports
Which LRU is used by the A-320 to access fault data from the CFDS? - Answers The
Multipurpose Control and Display Unit (MCDU)
The CFDS avionics Status data is available on which of the following aircraft? - Answers A-320
On the A-320, what level of troubleshooting involves an in-depth study of the failed system
through access of the binary or hexadecimal fault code data? - Answers Level 3
