Module 07 Maintenance Practices 100 Important Sentences for Revision

1. Workshop Safety and Practices

1. Safety is the first priority in any maintenance environment.
2. Always wear Personal Protective Equipment (PPE).
3. Smoking is prohibited in hangars and workshops.
4. Ensure fire extinguishers are available and serviceable.
5. Oxygen and fuel sources must be stored separately.
6. Use correct tools for the job to prevent damage or injury.
7. Keep the workplace clean and free of oil spills.
8. Never use compressed air to clean clothing or skin.
9. All electrical tools must be properly grounded.
10. Always follow the aircraft maintenance manual (AMM).

2. Hand Tools

11. Use spanners and wrenches that fit the nut or bolt exactly.
12. Never use pliers as a wrench.
13. Screwdrivers must fit the screw slot properly.
14. Torque wrenches apply precise tightening force.
15. Files should only be used on materials softer than the file.
16. Hammers are selected based on material type.
17. Micrometers measure dimensions with high accuracy.
18. Vernier calipers are used for external, internal, and depth measurements.
19. Dial indicators check surface alignment and runout.
20. Always return tools to their designated storage after use.

3. Torque and Locking Devices

21. The twisting force applied to a fastener is called torque.
22. Over-torquing can damage threads or bolts.
23. Under-torquing can lead to loosening during vibration.
24. Torque wrenches must be calibrated regularly.
25. Always tighten bolts using the manufacturer’s torque values.
26. Safety wire prevents loosening of critical fasteners.
27. Locknuts provide self-locking through friction or inserts.
28. Cotter pins secure bolts and nuts under vibration.
29. Tab washers lock nuts in place by bending a tab.
30. Torque seal paint helps identify loosened fasteners.

4. Aircraft Jacks and Supports

31. Aircraft jacking must be performed on level ground.
32. Always consult the AMM for jacking points.
33. Use the correct number of jacks as specified.
34. Safety stands must be positioned under the aircraft.
35. Never work under an aircraft supported only by jacks.
36. Use chocks on wheels not being lifted.
37. Hydraulic jacks must be inspected before use.
38. Ensure all personnel are clear before jacking.
39. Check for hydraulic leaks during operation.
40. Lower the aircraft slowly and evenly after maintenance.

5. Lifting, Rigging, and Weighing

41. Use slings and hoists rated for the load.
42. Never stand under a suspended load.
43. Center of gravity must be considered when lifting.
44. Rigging ensures control systems move correctly.
45. Always use rigging pins as per manual instructions.
46. Cable tensions vary with temperature.
47. Weighing determines the aircraft’s center of gravity.
48. Use calibrated scales for weighing.
49. Perform weighing indoors to avoid wind effects.
50. Record all weight and balance data accurately.

6. Aircraft Structures and Repairs

51. Aircraft structures include fuselage, wings, and empennage.
52. Fuselages are built using monocoque or semi-monocoque design.
53. Skin repairs must maintain aerodynamic smoothness.
54. Riveted joints are the most common structural fasteners.
55. Dents and cracks must be inspected as per limits.
56. Corrosion must be removed and treated immediately.
57. Doublers and patches restore structural strength.
58. Sheet metal bending must avoid cracking.
59. Drill holes at right angles to the surface.
60. Always deburr drilled holes to prevent stress points.

7. Control Cable Systems

61. Aircraft control cables transmit movement from cockpit to control surfaces.
62. Stainless steel is commonly used for control cables.
63. Cable tension changes with temperature.
64. Pulley alignment ensures smooth operation.
65. Cable guards prevent chafing and wear.
66. Turnbuckles are used to adjust tension.
67. Safety wire or clips secure turnbuckles.
68. Replace cables showing broken strands or corrosion.
69. Check for correct cable routing and clearance.
70. Lubricate cables as recommended.

8. Bearings and Lubrication

71. Bearings reduce friction between moving parts.
72. Ball bearings are used for radial loads.
73. Roller bearings are used for heavier loads.
74. Plain bearings depend on lubrication.
75. Bearing clearance must be within limits.
76. Always clean bearings with approved solvent.
77. Never spin bearings with compressed air.
78. Use correct type and grade of lubricant.
79. Grease reduces friction and prevents corrosion.
80. Over-greasing can cause overheating.

9. Non-Destructive Testing (NDT)

81. Visual inspection is the simplest NDT method.
82. Dye penetrant detects surface cracks in non-porous materials.
83. Magnetic particle testing detects surface cracks in ferrous metals.
84. Eddy current detects cracks without removing paint.
85. Ultrasonic testing identifies internal flaws using sound waves.
86. Radiography uses X-rays or gamma rays for internal inspection.
87. NDT must be done by certified personnel.
88. Always record NDT results in aircraft maintenance records.
89. Defects must be evaluated according to limits.
90. Repeat NDT after major repairs.

10. Aircraft Handling and Storage

91. Use approved towing equipment for aircraft movement.
92. Always have a qualified person in the cockpit during towing.
93. Install control locks when the aircraft is parked.
94. Use wheel chocks to prevent movement.
95. Use covers for pitot tubes, engines, and static ports.
96. Drain fuel tanks before long-term storage.
97. Lubricate moving parts before storage.
98. Record all preservation work in aircraft logbooks.
99. Dehumidifiers prevent corrosion during storage.
100. Always follow manufacturer procedures for aircraft handling