Dressing aircraft engines
Overview
This standard identifies the competences you need to carry out assembly operations to dress aircraft engines, in accordance with approved procedures. It covers both fixed wing and rotary winged aircraft engines. You will be required to obtain all the required tools and equipment for the assembly/dressing operations and to check that they are in a safe and usable condition. In carrying out the assembly operations, you will be required to follow laid-down procedures and specific assembly techniques, in order to assemble the various components onto the engine. The assembly activities will also include making all necessary checks and adjustments to ensure that components are correctly orientated, positioned and aligned, that moving parts have the correct working clearances, that all fasteners are tightened to the correct torque and that the assembled parts function as per the specification.
Your responsibilities will require you to comply with organisational policy and procedures for the assembly activities undertaken and to report any problems with the assembly activities, materials or equipment that you cannot personally resolve, or that are outside your permitted authority, to the relevant people. You will be expected to ensure that all tools, equipment and materials used in the installation are correctly accounted for on completion of the activities and to complete all necessary job/task documentation accurately and legibly. 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 carry out.
Your underpinning knowledge will provide a good understanding of your work and will provide an informed approach to applying the assembly/dressing techniques and procedures. You will understand the aircraft engine being dressed and its application and will know about the equipment, relevant components and fastening devices, 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 assembly 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:
- work safely at all times, complying with health and safety and other relevant regulations, directives and guidelines
- follow the relevant instructions, assembly drawings and any other specifications
- ensure that the specified components are available and that they are in a usable condition
- use the appropriate methods and techniques to assemble the components in their correct positions
secure the components using the specified connectors and securing devices
dress the aircraft engine in accordance with relevant standards
check the completed assembly to ensure that all operations have been completed and the finished assembly meets the required specification
- deal promptly and effectively with problems within your control and report those that cannot be solved
- complete the relevant documentation, in accordance with organisational requirements
- leave the work area and assembly 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 precautions to be taken whilst carrying out the dressing of aircraft engines (such as any specific legislation, regulations or codes of practice relating to the activities, equipment or materials)
- the health and safety requirements of the work area in which you are carrying out the engine dressing activities and the responsibility they place on you
- the hazards associated with the dressing of aircraft engines and how to minimise them and reduce any risks
- COSHH regulations with regard to the substances used in the engine dressing process
- 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 personal protective equipment and clothing (PPE) to be worn during the engine dressing activities
- the various types of drawing and specification that are used during the engine dressing and assembly activities
- how to identify the components to be used; component identification systems (such as codes and component orientation indicators)
- preparations and inspections to be undertaken on the components, prior to fitting them into the assembly
- the assembly methods and procedures to be used and the importance of adhering to the procedures
- how the components are to be aligned and positioned prior to securing, and the tools and equipment that are used (such as jigs and fixtures)
- the various mechanical fasteners that will be used and their method of installation (such as open and blind rivets, threaded fasteners, special securing devices)
- the importance of using the specified fasteners for the assembly and why you must not use substitutes
- how to complete fitting practices, meeting regulatory and organisational requirements (such as torque tightening, wire locking, fitting wire thread inserts, fitting O-ring seals, fitting lock nuts, blue bedding, seals, tab washers, cup washers and swage nuts)
- dealing with components or fastening devices incorrectly assembled, damaged or having other faults
- the application of sealants and adhesives within the assembly activities and the precautions that must be taken when working with them
- the quality control procedures to be followed during the assembly operations
- how to conduct any necessary checks to ensure the accuracy and quality of the assemblies produced
- how to detect assembly defects and what to do to rectify them (such as ineffective fasteners, foreign object damage)
- how to move large components and assemblies, the methods and equipment used to transport, handle and lift the components into position and how to check that the equipment is within its current certification dates
- how to check that the tools and equipment to be used are correctly calibrated and are in a safe, tested and serviceable condition
- the importance of ensuring that all tools are used correctly and within their permitted operating range
- the importance of ensuring that the completed assembly is free from dirt, swarf and foreign objects
- the importance of ensuring that all tools, equipment and components are accounted for and returned to their correct location on completion of the assembly activities
- the problems that can occur with the engine dressing activities and how they can be avoided
- the importance of informing appropriate people of non-conformances
- 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 assembly activities:
- obtain and use the appropriate documentation (such as job instructions, aircraft engine/module assembly drawings, planning and quality control 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 safe access and working arrangements for the assembly area
- obtain the correct tools and equipment for the activity and check that they are in a safe and usable condition and within current calibration date
- ensure that all the required components are available and have the correct part numbers
- follow safe practice/approved assembly/fitting techniques and procedures at all times
- ensure that components and surrounding structures are maintained free from damage and foreign objects
- return all tools and equipment to the correct location on completion of the assembly activities
- ensure that all work carried out is correctly documented and recorded
Use five of the following assembly methods and techniques:
- assembly of components by pressure
- torque setting of fasteners
- assembly of components by expansion or contraction
- applying sealant/adhesives
- aligning components
- drilling and riveting
setting working clearances
electrical bonding of components
- securing components using mechanical fasteners and threaded devices
- making connections to electrical components and harnesses
- applying bolt locking methods (split pins, wire locking, lock nuts, stiff nuts)
Carry out the dressing of the aircraft engine, by fitting ten of the following:
- fuel pipes
- valves (such as solenoid, bleed, pressure)
- thermocouples
- manifolds
- coolers (air, oil, fuel)
- electrical modules (if applicable)
- oil pipes
- heat exchangers (oil, fuel)
- electrical harnesses (if applicable)
- pumps
- sensors (such as vibration, fire)
- filters
- brackets
- air pipes
- engine suspension mounts
Carry out all of the required checks for accuracy, using the correct inspection testing equipment, to include:
- positional accuracy
- orientation
- freedom of movement
- alignment
- operating/working clearance
- completeness
- torque loadings
- freedom from damage or foreign objects
Dress aircraft engine assemblies in compliance with one of the following standards:
- Civil Aviation Authority (CAA)/European Aviation Safety Agency (EASA)
- extended twin operations procedures (ETOpS) (where appropriate)
- Ministry of Defence (MoD)
- Military Aviation Authority (MAA)
- Aerospace Quality Management Standards (AS)
- Federal Aviation Authority (FAA)
- BS, ISO or BSEN standards and procedures
- customer standards and requirements
- company standards and procedures
- engine manufacturer's requirements
Complete the relevant paperwork, to include one from the following and pass it to the appropriate people:
- build records
- job cards
- log 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