Sharong knowledge for maintenance and.pptx

This the procedure of Maintenance Process

1. ENHANCEMENT PROGRAM KNOWLEDGE SHARING TFN UNIT

2. SUBJECT TO LEARN MAINTENANCE PROCESS DEFINITION OF INSPECTION (Inspection Level and Method) DEFINITION OF DAMAGE TECHNICAL DOCUMENT STORE PROCEDURES PARTS CLASSIFICATION

3. OBJECTIVES To Enhance Maintenance Personnel Awareness. To Minimize Error (slip and lapse) during Maintenance/Inspection. To Improve Performance

4. MAINTENANCE PROCESS HARD TIME: A failure preventive process, whereby known deterioration of an item is limited to an acceptable level by maintenance actions carried out at time related periods.

5. MAINTENANCE PROCESS The prescribed action normally includes servicing, overhaul, partial overhaul and replacement In accordance with instructions in relevant manuals, so that the item concerned is either replaced or restored to such a condition that it can be released to service for a further specified period.

6. MAINTENANCE PROCESS CONDITION MONITORING A failure preventive process, whereby the item is inspected or tested in-situ, at specified periods, to an approved standard in order to determine continued serviceability. The fundamental purpose of this process is to remove the item before it fails in service

7. MAINTENANCE PROCESS Information from operational experience is collected, analysed and interpreted on a continuing basis as a means of implementing corrective procedures In other words, it is a statistically controlled process

8. MAINTENANCE PROCESS ON CONDITION: NOT a failure preventive process, having neither Hard Time nor Condition Monitoring elements. FIT AND FORGET philosophy

9. DEFINITION OF INSPECTION

10. INSPECTION LEVELS General Visual Inspection (GVI) A visual examination of an interior or exterior area , installation or assembly to detect obvious damage, failure or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area and under normally available lighting conditions.

11. INSPECTION LEVELS Detailed Inspection (DI) An intensive examination of a specific item , installation or assembly to detect obvious damage, failure or irregularity. Available lighting is normally supplemented with a direct source of strong lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses may be necessary. A DET can be more than just a visual inspection (SDET) since it may include tactile assessment in which a component or assembly is checked for tightness/security.

12. INSPECTION LEVELS 3. Special Detailed Inspection (SDI) An intensive examination of a specific item, installation, or assembly to detect damage, failure or irregularity. The examination is likely to make extensive use of specialized Inspection Techniques and/or equipment.

13. INSPECTION LEVELS Intricate cleaning and substantial access or disassembly procedure may be required. When such inspections are required, detailed NDT procedures are described in the Non destructive Testing Manual (NTM).

14. INSPECTION METHOD Check (CHK) Task performed to ensure that a system or component is still serviceable (check of bottle weight, check of firing circuit continuity, etc …) or that pressures or fluid levels are correct. Visual Check (VC) An observation to determine that an item is fulfilling its intended purpose. Does not require quantitative tolerances. This is a failure finding task.

15. INSPECTION METHOD 3. Walk Around Check (WAC) A visual examination of an exterior area, installation or assembly to detect obvious damage, failure or irregularity from ground level. 4. Operational Check A task to determine that an item is fulfilling its intended purpose. Do not require quantitative tolerances. This is a failure finding task.

16. INSPECTION METHOD 5. Functional Check A quantitative check to determine if one or more functions of a system/sub system or component perform, within specified limits. This task may call for the use of special test equipment.

17. DEFINITION OF DAMAGE SCRATCH A scratch is a line of damage of any depth and length in the material which causes a cross-sectional area change.

18. DEFINITION OF DAMAGE Gouge A gouge is a damage area of any size which results in a cross-sectional area change.

19. DEFINITION OF DAMAGE MARK A mark is a damaged area of all sizes where a concentration of scratches, nicks, chips, burrs or gouges etc. is shown. You must prepare the damage as an area and not as a series of individual scratches, gouges etc.

20. DEFINITION OF DAMAGE CRACK A crack is a partial fracture or complete break in the material.

21. DEFINITION OF DAMAGE DENT A dent is a damaged area which is pushed in, with respect to its usual contour.

22. DEFINITION OF DAMAGE NICK A small decrease of material due to a knock etc. at the edge of a member or skin.

23. DEFINITION OF DAMAGE DISTORTION Any twisting, bending or permanent strain which results in misalignment or change of shape

24. DEFINITION OF DAMAGE CORROSION The destruction of metal by chemical or electrochemical effect

25. DEFINITION OF DAMAGE CREASE A damaged area which is pushed in or folded back on itself.

26. DEFINITION OF DAMAGE ABRASION An abrasion is a damage area of all sizes which causes change in a cross-sectional area because of scuffing, rubbing, scraping or other surface erosion. It is usually rough and irregular.

27. DEFINITION OF DAMAGE DEBONDING Debonding is when a separation of materials occurs due to an adhesive failure.

28. DEFINITION OF DAMAGE DELAMINATION Delamination is when the separation of plies occurs in a multi-laminate material. This can be caused by the material being hit – Impact Delamination, or when there is a resin failure for any other reason.

29. DEFINITION OF DAMAGE FRETTING Surface damage at the interface between elements of the joints resulting from very small angular or linear movements.

30. TECHNICAL DOCUMENT Manufacturers will develop, regularly amend and distribute various technical manuals, to enable proper maintenance of their type approved products. These manuals include: Maintenance Manual. Illustrated Parts Catalogue. Structural Repair Manual. Wiring Diagram Manual. Fault Isolation Manuals ETC

31. TECHNICAL DOCUMENT ATA Specification No: 100 Major divisions are called ‘GROUP’, which consists of various chapters. GROUP CHAPTERS Aircraft General 01 – 19 Aircraft Systems 20 – 49 Structures 50 – 59 Propellers/ Rotors 60 – 69 Power Plant 70 – 89

32. TECHNICAL DOCUMENT Each subject is divided into page groups in blocks of 100 : 001 – 100 Description and Operation. 101 – 200 Trouble Shooting. 201 – 300 Maintenance Practices. 301 – 400 Servicing. 401 – 500 Removal and Installation. 501 – 600 Adjustment and Test. 601 – 700 Inspection and Check. 700 – 800 Cleaning and Painting. 801 – 900 Approved Repairs.

33. STORE PROCEDURES All parts and materials used in the construction, servicing, maintenance, repair and modification of civil aircraft must originate from DGCA approved source or a source acceptable to DGCA. When spares are released, evidence must be provided that the said stores conform to the requirements as laid down in the relevant section of CASR.

34. STORE PROCEDURES All approved stores must comprise : Quarantine Stores This stores all incoming parts until it can be proven that they: conform to the DGCA specifications. bear proper and correct certification. not damaged during transit.

35. STORE PROCEDURES Bonded Stores This stores all parts that are properly documented and can be traced back to an approved source. All parts or spares are given BATCH NUMBER and stored in separate bins. Flammable materials are stored separately or in a flame proof cabinet. All shelf life shall be recorded for release from stores. All outgoing spares from Bonded Stores to service shall be issued with a company Serviceable Label which can be traced back to Authorized Release Certificate – Airworthiness Approval Tag (ARC-AAT).

36. PARTS CLASSIFICATION Aircraft parts are classified according to the degree of importance: CLASS 1 Means a complete Type Certified aircraft, engines and propellers.

37. PARTS CLASSIFICATION CLASS 2 Means major components of Class 1 products. E.g. Wings, fuselage, landing gears, power transmissions, control surfaces

38. PARTS CLASSIFICATION CLASS 3 Any part or component that is not a Class I or Class II product, including standard parts. Class III products are considered to be parts.

39. PARTS CLASSIFICATION STANDARD PARTS Is a part manufactured in complete compliance with an established U.S. Government or industry-accepted specification which includes design, manufacturing, and uniform identification requirements.