Testing uninstalled aircraft assisted escape system (AAES) components
Overview
This standard identifies the competences you need to test uninstalled aircraft assisted escape system (AAES) components, in accordance with approved procedures. It includes the testing of equipment and components associated with ejection seats, canopy jettison and fragmentation systems and other associated systems. You will be required to select the appropriate tools and equipment to use, based on the operations to be performed and the components to be tested. The complexity of tests involved will include visual inspection, pressure leakage tests, continuity checks, 'no volt' checks, alignment checks, system component tests and 'special-to-type' tests, as applicable.
Your responsibilities will require you to comply with organisational policy and procedures for the tests undertaken on aircraft assisted escape systems and to report any problems with the testing activities that you cannot personally resolve, or that are outside your permitted authority, to the relevant people. You will be expected to work with a minimum of supervision and instruction, taking personal responsibility for your own actions and for the quality and accuracy of the tests that you carry out.
Your underpinning knowledge will provide a good understanding of your work and will provide an informed approach to applying test procedures for aircraft assisted escape system components. You will understand the component under test and its application and will know about the test equipment and test techniques, in adequate depth to provide a sound basis for carrying out the activities, correcting faults and ensuring that the tested system performs to the required specification.
You will understand the safety precautions required when testing the aircraft assisted escape system components. You will be required to demonstrate safe working practices throughout and will understand the responsibility you owe to yourself and others in the workplace.
Performance criteria
You must be able to:
- work safely at all times, complying with health and safety and other relevant regulations, directives and guidelines
- follow the appropriate procedures for use of tools and equipment to carry out the required tests
- set up and carry out the tests using the correct procedures and within agreed timescales
- record the results of the tests in the appropriate format
- review the results and carry out further tests if necessary
- leave the escape system in a safe and appropriate condition, free from foreign object debris on completion of the activities
Knowledge and Understanding
You need to know and understand:
- the specific safety practices and procedures that you need to observe when testing uninstalled aircraft assisted escape system components (such as any specific legislation, regulations/codes of practice for the activities, equipment or materials)
- the health and safety requirements of the work area where you are carrying out the activities and the responsibility these requirements place on you
- the safety procedures that must be carried out before work is started on testing the system components
- the requirements and importance of understanding and applying human factors as defined by the regulatory requirements and the potential impact if these are not adhered to
- the protective clothing and equipment (PPE) to be worn and where it can be obtained
hazards associated with testing uninstalled aircraft assisted escape system components and with the tools and equipment used and how to minimise them and reduce any risks
the precautions to be taken to prevent electrostatic discharge (ESD) damage to circuits and sensitive components (such as use of earthed wrist straps)
what constitutes a hazardous voltage and how to recognise victims of electric shock
how to reduce the risks of a phase to earth shock (such as insulated tools, rubber matting and isolating transformers)
the correct operating procedures of the system/components being tested
- electrical bonding specifications and their importance
- how to extract and use information from engineering drawings and related specifications
- how to obtain the required test schedules and specifications for the system being tested and how to check their currency and validity
- how to read and interpret the test schedules and specifications
- the types of test to be carried out on the uninstalled aircraft assisted escape systems (such as visual checks, continuity tests,
no volt' tests, pressure leakage tests, system component tests andspecial-to-type' tests) - the methods and procedures to be used to carry out the various tests on the aircraft assisted escape system components
- test equipment to be used and its application for particular tests
- the calibration of test equipment (where applicable) and the currency/issue checks to be done
- the fault finding techniques to be used if the components fail the tests
- the techniques, methods and procedures to be used during the tests
- why tool/equipment control is critical and what to do if a tool or piece of equipment is unaccounted for on completion of the activities
- the principle of operation of the system under test and the function of the individual components within the system
the importance of carrying out the tests in the specified sequence
how to record the results of each individual test and the documentation that must be used
- from whom to seek authorisation if you need to alter or change the test procedures
- how to analyse the test results and make valid decisions about the acceptability of the system
- problems that can occur with the testing activities and how they can be overcome
- any required environmental controls relating to the testing
- the documentation to be completed at the end of the testing activities
- the extent of your own responsibility and to whom you should report if you have problems that you cannot resolve
Scope/range
Scope Performance
Carry out all of the following during the testing of the uninstalled aircraft assisted escape system components:
- obtain and use the appropriate documentation (such as job instructions, test schedule, test procedures, history sheets, flight logbook, aircraft standards and other relevant documentation)
- adhere to procedures or systems in place for risk assessment, COSHH, personal protective equipment and other relevant safety regulations and procedures to realise a safe system of work
- provide and maintain a safe working environment for the testing activities
- obtain the correct tools and equipment for the activity and check that they are in a safe, tested and usable condition and within current certification/calibration date
- obtain clearance to work on the component and observe all relevant isolation and safety procedures
- ensure that safe working distance procedures are set up (where appropriate)
- carry out the tests using the specified techniques and procedures
- return all tools and equipment to the correct location on completion of the testing activities
Test four of the following aircraft assisted escape system components:
- ejection guns
- barostatic time release units
- main beams
- breech type time delay units
- seat pans
- harness power retraction units
- drogue guns
- parachute deployment units
- mode selectors
- seat sequencing computer
- command ejection units
- personal equipment connectors
- remote rocket initiators
- gas operated firing units
- standard firing units
- automatic backup unit
- power supply unit or battery units
- other specific system components
Test aircraft assisted escape system components, using the following:
- 'special-to-type' test rigs
And two more of the following:
2. safety ohmmeter
3. air pressure gauges
4. multimeter
5. connecting equipment
6. other specific test devices
Carry out three of the following types of test:
- 'no volts' check
- system components tests
- continuity checks
- pressure leakage checks
- visual inspection
- 'special-to-type' tests
Deal with two of the following levels of complexity during the testing activities:
- equipment with no faults
- equipment with faults
- equipment with intermittent faults
Use two of the following fault finding techniques:
- six point
- input-to-output
- equipment self-diagnostics
- half-split
- function testing
- emergent problem sequence
- injection and sampling
- unit substitution
Review and record the fault symptoms and history of problems, using four of the following sources:
- the person who reported the fault
- sensory input (such as sight, sound, smell, touch)
- monitoring equipment
- fault records
- investigation reports data sheets
- equipment records/history
- aircraft documentation
- operation of the equipment
Carry out tests in accordance with one of the following standards:
- Civil Aviation Authority (CAA)/European Aviation Safety Agency (EASA)
- Ministry of Defence (MoD)
- Military Aviation Authority (MAA)
- Aerospace Quality Management Standards (AS)
- Federal Aviation Authority (FAA)
- BS, ISO or BSEN procedures
- customer standards and requirements
- company standards and procedures
- manufacturer standards and procedures
Complete the relevant paperwork, to include one from the following and pass it to the appropriate people:
- computer records
- record/history cards
- job cards
- aircraft service/flight log
- other specific recording method
Scope Knowledge
Values
Behaviours
You will be able to apply the appropriate behaviours required in the workplace to meet the job profile and overall company objectives, such as:
- strong work ethic
- positive attitude
- team player
- dependability
- responsibility
- honesty
- integrity
- motivation
- commitment