EASA Module 7 case studies
EASA Module 7 · Put your knowledge to work in context.
Module 7 - Maintenance Practices is one of the knowledge modules that make up the EASA Part-66 aircraft maintenance licence syllabus. Its regulatory home is Commission Regulation (EU) No 1321/2014 on continuing airworthiness, adopted on 26/11/2014 and published in the Official Journal under reference OJ L 362, 17.12.2014, p. The EASA Module 7 case studies are 5 cases and about 3,514 words.
1Wheel-hub bearing fit measured in a hot workshop
A main landing-gear wheel hub is being rebuilt. The aluminium-alloy hub bearing bore is called out on the drawing as Ø120.000–120.035 mm and the bearing outer diameter as Ø120.045–120.060 mm; the required interference fit is 0.010–0.045 mm, all at 20 °C.
759 words, about 4 min2New 28 V DC feeder: voltage drop versus breaker size
You are installing a 28 V DC feeder to a new 20 A continuous-load unit in the aft equipment bay. The route measures 11 m one-way, so the conductor loop is 22 m.
628 words, about 3 min3Flush rivet repair layout on a 1.6 mm fuselage skin
You are laying out a flush-riveted repair on a pressurised fuselage skin of 2024-T3, 1.6 mm thick, with a 2024-T3 doubler 1.2 mm thick - a 2.8 mm stack. The rivet chosen is MS20426AD4, diameter 4.0 mm.
685 words, about 3 min4Avionics change: empty weight, CG, and whether to reweigh
The last weighing of a light twin gave an empty weight of 1,180 kg with the EWCG at 2.72 m aft of the datum. The approved envelope for weights up to 1,500 kg is 2.60–3.05 m aft of the datum; maximum take-off weight is 1,520 kg.
693 words, about 3 min5Cracked 2024-T3 bracket: weld, braze, or replace?
A 3 mm 2024-T3 aluminium bracket that carries a galley locker has a 25 mm crack running out from a bolt hole. The illustrated parts catalogue lists the bracket as 2024-T3, and it is not primary structure.
749 words, about 4 min