Aircraft Systems Test: Safety Features Quiz and Flashcards

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Questions and Answers

What prevents tests from running during flight?

CMCS by special safety features

Which switch interrupts all test signals during flight when in the NORMAL position?

ground test enable switch

What does the switch guard prevent during flight?

inadvertent operation

What is the System test primarily comparable to?

power up test Signup and view all the answers

When is a test result considered clear?

if no failure detected Signup and view all the answers

In the System Test, what does a clear message confirming the failure of the CSU mean?

suspected in the post flight report as the most probable cause Signup and view all the answers

What are the two main purposes for the different test functions on a CMC?

<ol> <li>To confirm that the LRU really faulty 2. To make sure that a repair or component removal solved the problem.</li> </ol> Signup and view all the answers

What are the three different tests available in the Airbus CMC system?

<ol> <li>System test 2. Complementary test 3. Output test</li> </ol> Signup and view all the answers

How many different types of tests are available from the menu in the Boeing CMC system?

Two Signup and view all the answers

What are the confidence tests primarily used for in the Boeing CMC system?

Preflight checks Signup and view all the answers

What is the process for conducting tests on a CMC system?

<ol> <li>Select the system you want to test 2. Select the test by pressing the line select key 3. Send test request signal to the system computer 4. BITE Display shows the message 'test in progress' 5. BITE controls necessary test steps 6. Test result appears on the central maintenance computer display</li> </ol> Signup and view all the answers

What is the main function of the BITE Display during the testing process?

Show 'test in progress' message Signup and view all the answers

What action should you take if the ground test for FLAP CONTROL - L shows a 'Fail' result?

Press the LS key next to FAIL message to get information for corrective action. Signup and view all the answers

What is the purpose of BITE in the testing process?

BITE generates inputs to actuators and valves, then checks the result by reading the feedback signals. Signup and view all the answers

What are the initial conditions that must be fulfilled before starting the complementary test?

The hydraulic system must be pressurized or HYD ON. Signup and view all the answers

How can you bring the aircraft back to its status before starting the test?

Perform a Test Close Up to bring the aircraft back to the status before the test began. Signup and view all the answers

What does a 'Pass' test result indicate?

A 'Pass' result shows that no fault was found during the test. Signup and view all the answers

What caution is given before the start of the complementary test?

A caution is given advising of risks of personal injury and possible damage to the aircraft. Signup and view all the answers

Study Notes

CMCS Tests

Tests are not allowed to run during flight due to the danger of influencing flight safety.
The CMCS prevents tests during flight by special safety features.

Test Sequence

System test is primarily a computer test, comparable to the power-up test.
System test result shows:
Test OK if no failure detected
Name of the LRU that failed the test with a clear message
Not a clear message requires additional information from the trouble shooting manual before repair can start

Trusting Test Results

A test result can only be trusted if all components responsible for a reported fault have been really tested.
In doubt, refer to the trouble shooting or maintenance manual to see the content of the test.

Manual Snapshot and Additional Data Retrieval

Additional data retrieval functions of the Boeing CMC include:
Hidden behind the CMC menu item "other functions"
SHOP FAULTS information for workshop people
INPUT MONITORING information about system input data in coded format
Configuration - data about the computer program version
These options are not used for normal maintenance.

CMCS Tests Purposes

Two main purposes for the different test functions on a CMC:
1. To confirm that the LRU really faulty
2. To make sure that a repair or component removal solved the problem

Airbus CMC System

Up to three different tests are available:
1. System test - available in all systems
2. Complementary test
3. Output test
Complementary test and output test are only available in certain systems

Boeing CMC System

Two different types of tests are available from the menu:
1. Ground tests - available for all major systems
2. Confidence tests - available for only a few systems, used mainly for pre-flight checks

Test Operation

Select the system to test
Select the test by pressing the line select key
Bite sends a test request signal to the system computer
Bite displays "test in progress" while controlling the necessary test steps in the system
Test result appears on the display when finished

Ground Test

Ground test for FLAP CONTROL - L
Test result appears when the test finishes:
Pass: no fault was found
Fail: press the LS key next to "FAIL" message to get the information to take corrective action

CMCS Complementary Tests

When a component is not tested during the system test, for example, the moving parts of the Airbus system
Four different complementary tests are available for the flap system
Before starting the complementary test:
Caution message advises of risks of personal injury and possible damage to the aircraft
Fulfill initial conditions: hydraulic system must be pressurized or HYD ON
BITE generates inputs to actuators and valves, checks the result by reading the feedback signals, and presents the test result

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Description

Test your knowledge on safety features related to conducting tests on aircraft systems. Learn about the limitations and precautions necessary to ensure flight safety is not compromised. Explore how the CMCS system prevents tests during flights and the unique features that enable certain tests to be carried out during flight.

Aircraft Systems Testing Safety Features Quiz