40 Questions
What is the primary reason for consulting standing instructions when preparing an aircraft for testing or troubleshooting?
To ensure compliance with local safety and maintenance requirements
What should be done to the area to be inspected prior to testing or troubleshooting?
Clean the area
Why is it essential to brief the maintenance team on testing/troubleshooting procedures?
To avoid mistakes and ensure a safe testing or troubleshooting environment
What should maintenance personnel do with maintenance circuit breakers prior to testing or troubleshooting?
Pull and then reset them according to the maintenance manual
What is the purpose of having spill kits available during testing or troubleshooting?
In case of leaks or spills during testing or troubleshooting
What should be done with unions prior to applying pressure during testing or troubleshooting?
Torque them
What is the purpose of positioning GSE during testing or troubleshooting?
To position the GSE where it will not impede testing or place personnel in danger
What is the primary source of guidance for maintenance personnel during testing or troubleshooting?
The maintenance manual
When should hydraulic components and systems be tested?
Any time a component has been disturbed, adjusted or changed
What type of pump can be used to operationally check the hydraulic system on an aircraft?
Electrically driven auxiliary pump or a portable hydraulic test rig
Where are hydraulic components that have been removed from the aircraft typically examined and tested?
At an authorised maintenance facility
What is checked during functional testing of a reassembled hydraulic component?
Internal and external leakage, and cycled through a full range of movement
What information is displayed on an ECAM hydraulic system synoptic display?
Flow lines, digital representation of hydraulic pressure, and hydraulic pump status
What does the LO symbol indicate on an ECAM hydraulic system synoptic display?
Low hydraulic quantity
Why is it important to test hydraulic components and systems?
To ensure safe operation and prevent accidents
Where are break-down parts of a hydraulic component examined?
At an authorised maintenance facility
What is the purpose of a pressure relief test?
To ensure excess cabin pressure is vented to atmosphere
What is the nominal value of cabin pressure used for a fighter aircraft during a static pressure check?
5.0 PSI
What is the purpose of the manual dump system?
To vent excess pressure to atmosphere in an over-pressure condition
What is checked during a cabin static pressure check?
The integrity of aircraft pressure vessel structure and its sealing
What is the purpose of the safety valve?
To vent excess cabin pressure to atmosphere
What is checked during a pressure relief test?
The automatic operation of the safety valve and the manual dump system
What is the nominal value of cabin pressure used for a passenger aircraft during a static pressure check?
10.92 PSI
What is inspected during a cabin static pressure check?
The aircraft's exterior
What is the primary purpose of troubleshooting in an aircraft?
To identify and repair faulty systems
During configuration of an aircraft for troubleshooting a hydraulic system, which of the following practices is NOT recommended?
Applying pressure to the system without proper precautions
What is the primary purpose of fuel systems examination?
To identify leaks in the system
What is the most likely cause of damage to boost pumps during testing?
Sudden changes in pressure during testing
When are water drain tests typically conducted?
After a fuel system repair
What is a common problem associated with fuel transfer checks?
Inaccurate fuel level readings
Referring to Figure 3, what could be a possible cause of a fuel tank reading empty and another tank reading full?
Incorrect fuel level sensor calibration
What is the purpose of having two people on board large aircraft during pressurisation checks?
To provide additional safety during testing
What is a primary concern when examining ECS components?
Security
What should be done to the system if it operates correctly in manual mode?
Check the system again in auto mode
What is a possible cause of cabin temperature being too high or too low?
Defective temperature sensor
What should be done to the temperature sensor if it is defective?
Replace the sensor with a serviceable item
What should be checked for during the examination of ECS components?
Security, leakage, cracked or loose mounting brackets, and duct or component chafing
What is the purpose of the troubleshooting tables in the ECS fault-finding scenarios?
To provide basic air-conditioning fault-finding scenarios
What should be done if the system operates correctly in manual mode but not in auto mode?
Check the system again in auto mode
What is a possible correction for a cabin temperature that is too high or too low?
Replace the temperature sensor with a serviceable item
Study Notes
Preparing Aircraft for Testing or Troubleshooting
- Consult standing instructions to ensure compliance with local safety and maintenance requirements
- Ensure all unions are torqued prior to applying pressure
- Clean the area to be inspected and rope off the area if necessary to prevent non-essential personnel from entering the work area
- Pull and reset maintenance circuit breakers according to the maintenance manual
- Use the prescribed source of power according to the maintenance manual
- Position Ground Support Equipment (GSE) to avoid impeding testing or placing personnel in danger
- Have spill kits available in case of leaks
- Brief the maintenance team on testing and troubleshooting procedures before commencing maintenance
- Use an appropriate source of communication
Hydraulic System Testing and Troubleshooting
- Perform testing and troubleshooting according to the manufacturer's instructions and at specified intervals
- Test hydraulic components and systems after any disturbance, adjustment, or change
- Conduct operational checks on the aircraft using an engine-driven pump, electrically driven auxiliary pump, or portable hydraulic test rig
- Examine and test removed components at an authorized maintenance facility
- Functionally test components on a hydraulic test bench after reassembly
ECAM Display for Hydraulics
- Displays flow lines, hydraulic flow, and position of hydraulic system valves
- Displays digital representation of hydraulic pressure and a sliding scale representing quantity
- Displays hydraulic pump status
ECS Component Examination
- Examine ECS components for security, evidence of leakage, cracked or loose mounting brackets, duct or component chafing, and frayed or torn insulation blankets
- Ensure ducting is securely attached and adequately supported, and insulation blankets are in good repair and secure around the ducting
Fault-Finding Scenarios
- Cabin temperature too high or too low may be caused by defective temperature sensor or controller
- Defective temperature sensor or controller can be corrected by replacing the temperature sensor with a serviceable item
Pressure Relief and Dump Valve Check
- Perform a pressure relief test to ensure excess cabin pressure is vented to atmosphere in case of an over-pressure condition
- Check automatic operation of the safety valve and manual dump system to ensure excess pressure is vented to atmosphere
Cabin Static Pressure Check
- Perform a static pressure check to confirm the integrity of aircraft pressure vessel structure and sealing
- Pressurize the aircraft with a constant supply of air at a set pressure value (e.g. 5.0 PSI for a fighter aircraft or 10.92 PSI for a passenger aircraft)
- Check the aircraft exterior for cracks, distortion, bulges, and rivet condition
Best practices to follow when preparing an aircraft for testing or troubleshooting, including ensuring compliance with safety and maintenance requirements and preparing the work area.
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