Part-66 Module 1 case studies
Part-66 Module 1 · Put your knowledge to work in context.
Part-66 Module 1 (Mathematics) is one of the basic knowledge modules that make up the aircraft maintenance licence knowledge requirement under the European aviation maintenance licensing framework. It is aimed at candidates working toward, or maintaining, a Part-66 aircraft maintenance licence, and at training organisations building Part-147 basic courses around the module syllabus. The module covers the mathematical foundations used throughout aircraft maintenance: arithmetic, algebra, geometry and trigonometry, and the interpretation of graphs and simple statistical measures, applied to practical engineering calculations rather than pure theory. Because mathematics underpins later modules - physics, electrical and electronic fundamentals, and aerodynamics in particular - it is usually studied early and treated as a building block rather than an isolated subject. The Part-66 Module 1 case studies are 5 cases and about 1,749 words.
1Landing Gear Retraction Time Limit
During a pre-flight check on a light twin-engine aeroplane, the pilot notices that the landing gear retraction cycle takes 8.5 seconds, while the Aircraft Maintenance Manual (AMM) specifies a maximum of 7 seconds. The hydraulic system pressure is within limits at 2100 psi, and the fluid level is correct.
349 words, about 2 min2Intermittent Radio Communication Failure
A commuter aircraft experiences intermittent VHF radio communication failures. The problem occurs only when the aircraft is flying in heavy rain and at altitudes above 10,000 feet.
335 words, about 2 min3Engine Oil Consumption Trend
A four-cylinder reciprocating engine on a training aircraft has been consuming oil at an increasing rate. Over the last 50 hours, oil consumption has risen from 0.1 quarts per hour to 0.4 quarts per hour.
348 words, about 2 min4Autopilot Altitude Hold Oscillation
A helicopter is equipped with a two-axis autopilot. During a test flight, the autopilot in altitude hold mode causes the helicopter to oscillate vertically with an amplitude of ±50 feet at a frequency of 0.5 Hz.
369 words, about 2 min5Corrosion in Wing Spar
During a routine inspection of a 20-year-old light aircraft, corrosion is found on the lower wing spar flange at the wing root. The corrosion appears as white powder and pitting, covering an area of about 2 square inches.
348 words, about 2 min