Part-66 Module 6 case studies

Part-66 Module 6 · Put your knowledge to work in context.

Part-66 Module 6 - Materials and Hardware is one of the knowledge modules that make up the aircraft maintenance licence (AML) syllabus under the EU Part-66 framework. It is aimed at trainee and practising certifying staff - typically candidates working toward a B1 (mechanical) or B2 (avionics) licence, either through a Part-147 approved basic training course or through self-study followed by examinations at the competent authority. The Part-66 Module 6 case studies are 5 cases and about 3,445 words.

Galley Floor Beams: Pitting at Stainless Brackets on a Coastal Aircraft

During a heavy check on a coastal-based regional turboprop, the galley floor is opened for the first time in four years. The floor beams are 2024-T3 clad aluminium sheet, 1.6 mm thick.

717 words, about 4 min 2

Hi-Lok Grip, Edge Distance and Hole Condition on a Web Repair

A repair scheme calls for 3/16 in (4.8 mm) Hi-Lok fasteners through a 1.6 mm 2024-T3 web into an 11 mm aluminium block, giving a stack that measures 12.2 mm to 12.8 mm; twenty holes are involved. Stores holds pins with 12 mm, 13 mm and 14 mm grip lengths.

692 words, about 3 min 3

Dent With a Dull Tap on a Composite Flap Trailing Edge

After a ground-handling incident, a carbon/epoxy flap trailing-edge skin 2 mm thick shows an 8 mm dent, 0.4 mm deep, with cracked paint but no visible broken fibres or puncture. The aircraft then stood outside in tropical humidity for three weeks; skin temperature at inspection is 45 degrees C.

648 words, about 3 min 4

Replacement 3000 psi Line: Bad Flare, Misalignment and a Blue Stain

A 3/8 in OD 2024-T3 hydraulic line on a transport aircraft is being replaced after chafing was found. The technician cuts the new tube to length with a hacksaw, deburrs, and flares it with the workshop's 37 degree flaring tool, whose die is worn; the resulting flare shows chatter marks and slight ovality.

685 words, about 3 min 5

EWIS Reroute: Separation, Splices and a Pushed-Back Contact

During an avionics modification, a technician reroutes a 20 AWG signal bundle around a new rack. The bundle, insulated with 105 degrees C PVC, is now clamped every 600 mm, passes within 15 mm of a 115 V AC feeder, and bends sharply (about two bundle diameters) into a connector.

703 words, about 4 min