NCATT AET AEIT Endorsement Exam Prep – 120 Questions & Answers on Aircraft Wiring, Bonding, Grounding, and Inspection | NCATT 2026

This document is a structured NCATT AET/AEIT (Aircraft Electronics Technician / Aircraft Electronics Installation Technician) endorsement exam preparation resource containing approximately 120 exam-style questions with verified answers focused on aircraft electrical systems, avionics installation standards, wiring practices, inspection procedures, and aviation maintenance documentation. The content is organized in a concise question-and-answer format designed to reinforce the core technical knowledge required for technicians pursuing avionics certification and endorsement examinations. The study material begins with fundamental electrical and avionics installation concepts, including electromagnetic interference (EMI), grounding systems, bonding techniques, and conductor plating used in aircraft wiring. Early sections explain how electromagnetic fields can induce unwanted voltages in wires and components, which may interfere with avionics systems, and how proper grounding and bonding procedures provide safe electrical paths to dissipate unwanted current and prevent radio frequency interference. A major portion of the document focuses on aircraft wiring standards and installation practices, referencing guidance from FAA Advisory Circular AC 43.13-1B, which provides accepted methods, techniques, and practices for aircraft inspection and repair. Topics include voltage drop limitations, wire identification standards, shielded wiring, conductor materials, wire marking procedures, and cable voltage ratings. The material also explains proper routing techniques, minimum bend radius requirements, service loops, drip loops, strain relief methods, and clamping intervals necessary to maintain wiring integrity and prevent damage from vibration or environmental exposure. The guide also reviews inspection and quality assurance procedures used in aviation maintenance, including receiving inspection processes, preliminary inspection methods, verification of part authenticity, and identification of suspected unapproved parts (SUP). Procedures for handling suspect components—such as quarantine procedures and reporting through FAA Form 8120-11—are discussed alongside documentation practices required for compliance with aviation maintenance regulations. Additional sections examine aircraft lightning protection and static discharge systems, including bonding straps, static wicks, lightning diverter strips, and radome protection systems. These components are essential for protecting avionics equipment from electrical discharge and ensuring that static electricity accumulated during flight is safely dissipated through the airframe. For example, the document explains that bonding straps provide conductive paths between aircraft structures to prevent static buildup and protect sensitive electronic systems. The document also covers technical standards and aviation certification approvals, including Technical Standard Orders (TSO) and Parts Manufacturer Approval (PMA), which define performance standards and manufacturing authorization for aircraft components. Record-keeping requirements are also reviewed, including work order documentation, service bulletin compliance records, equipment configuration data, and return-to-service documentation following maintenance or alteration. Overall, the content aligns closely with training materials used in avionics technician programs and certification preparation resources such as “Aircraft Electricity and Electronics” by Thomas Eismin and FAA Advisory Circular AC 43.13-1B: Acceptable Methods, Techniques, and Practices – Aircraft Inspection and Repair. These references are widely used in aviation maintenance schools and avionics technician training programs. This study guide may be particularly useful for students and professionals in programs such as: NCATT Aircraft Electronics Technician (AET) certification preparation Aircraft Electronics Installation Technician (AEIT) endorsement training Avionics Technology and Aircraft Maintenance programs Aviation Maintenance Technician (AMT) programs Aerospace Engineering Technology and Avionics Systems courses FAA Part 147 aviation maintenance school programs It is especially relevant for avionics technicians, aircraft maintenance students, aerospace engineering technology students, and aviation maintenance professionals preparing for NCATT avionics endorsement examinations or reviewing aircraft electrical installation standards, wiring practices, grounding procedures, and inspection protocols. 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