Marking out composite and/or metallic aircraft components
Overview
This standard identifies the competences you need to mark out composite and/or metallic aircraft components, in accordance with approved procedures. It covers both fixed wing and rotary winged aircraft. You will be required to select the appropriate equipment to use, based on the features to be marked out and the accuracy required and this will include the use of precision instruments. Marking out will be in preparation for activities such as aircraft detail fitting, machining, development of simple patterns for fabrication purposes or the production of templates.
Materials to be marked out will include ferrous, non-ferrous, non-metallic and composites and may be in flat form, square or rectangular section, circular or irregularly shaped. In some circumstances, you will need to take material grain flow into account when carrying out the marking out activities.
Your responsibilities will require you to comply with organisational policy and procedures for the marking out activities undertaken and to report any problems with the marking out activities, materials used or marking out equipment that you cannot personally resolve, to the relevant people. You will be expected to work with a minimum of supervision, taking personal responsibility for your own actions and for the quality and accuracy of the work that you produce.
Your underpinning knowledge will provide a good understanding of your work and will provide an informed approach to applying marking out procedures. You will understand the marking out process and its application and will know about the equipment, relevant materials and marking mediums in adequate depth to provide a sound basis for carrying out the activities to the required specification.
You will understand the safety precautions required when carrying out the marking out activities. 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:
| 1. work safely at all times, complying with health and safety and other relevant regulations, directives and guidelines 2. obtain and use the correct information for marking out 3. obtain the appropriate marking out equipment and check that it is in a usable condition 4. prepare suitable datum and marking out surfaces 5. mark out using appropriate methods 6. check that the marking out complies with the specification 7. deal promptly and effectively with problems within your control and report those that cannot be solved 8. complete the relevant documentation, in accordance with organisational requirements 9. leave the work area 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 marking out (including any specific legislation, regulations/codes of practice for the activities, equipment or materials (such as marking mediums))
- the health and safety requirements of the work area in which you are carrying out the marking out activities and the responsibility these requirements place on you
- the hazards associated with marking out aerospace materials and structures and how to minimise them and reduce any risks
- the protective equipment that you need to use for both personal protection (PPE) and protection of the aircraft components
- how to extract and use information from engineering drawings and related specifications (to include symbols and conventions to appropriate BS, ISO or BSEN standards) in relation to work undertaken
- how to interpret first and third angle drawings, imperial and metric systems of measurement, workpiece reference points and system of tolerancing
- how to carry out currency/issue checks on the specifications you are working with
- the principles of marking out and the equipment used in the aerospace industry
- how to select and establish suitable workpiece datums
- methods of holding and supporting workpiece during the marking out activities and equipment that can be used
- how to mark out the workpiece (including datums, guidelines, square and rectangular profiles, circular and radial profiles, angles, holes which are linearly positioned, boxed and on pitch circles)
- the various methods of pattern development that can be used (such as parallel line, radial line, triangulation) and typical applications of each method
- how to clean and prepare the surfaces to be marked out ensuring, where appropriate, that grain flow is taken into account
- how to calculate bending allowances for marking out
- 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
- standards to be attained and company quality control procedures
- 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 activities during marking out:
- obtain and use the appropriate documentation (such as job instructions, installation drawings, planning and quality control documentation, aircraft procedures and specifications)
- 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 marking out activities
- obtain the correct tools and equipment for the marking out activity and check that they are in a safe, tested and usable condition and within current calibration date
- follow safe practice/approved marking out techniques and procedures at all times
- return all tools and equipment to the correct location on completion of the marking out activities
- dispose of waste materials in accordance with approved procedures
Mark out a range of material forms, to include three from:
- flat materials
- rolled sections
- machined items
- curved surfaces
- irregular shaped items
- castings/forgings
- cylindrical sections
- assemblies
- composite mouldings
Use marking out methods and techniques which include two from:
- direct marking using instruments
- tracing/transfer methods
- use of templates
- through skin sensor
Use five of the following types of marking out equipment:
- rules/tapes
- squares
- Vernier instruments
- laser tracking
- protractors
- dividers/compass
- jigs for marking out
- scribers
- approved aerospace markers
Mark out workpieces, to include five of the following features:
- datum/centre lines
- laser tracking
- simple allowances for bending
- square/rectangular profiles
- linear hole positions
- pattern development
- angles/angular profiles
- radial hole positions
- other specific shapes/profiles
- circles and radial profiles
Mark out workpieces in compliance with one of the following:
- Civil Aviation Authority (CAA)/European Aviation Safety Agency (EASA)
- Ministry of Defence (MoD)
- Military Aviation Authority (MAA)
- Aerospace Quality Management Standards (AS)
- BS, ISO or BSEN standards and procedures
- Federal Aviation Authority (FAA)
- customer standards and requirements
- company standards and procedures
- manufacturers standards and procedures
Complete the relevant paperwork, to include one from the following and pass it to the appropriate people:
- build records
- log cards
- job cards.
- aircraft 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