REES
Electrical and Electronic Systems for RPAS
Electrical terms, RPA components, batteries, charging, GPS, electromagnetic radiation, EMI and signal reliability.
Part 101 MOS C10 Schedule 4, Unit 4, items 1-9.
Lessons
Batteries, Electronics and Signal Reliability
Understand the electrical chain that keeps an RPA powered, controlled and recoverable.
Source: RePL Study Guide pp. 142-183; Part 101 MOS C10 pp. 97-99.
Battery Management, Charging and Power Margins
Read battery labels, calculate usable energy, manage charging and storage risk, and preserve enough reserve to recover the aircraft safely.
Source: RePL Study Guide pp. 161-165; Part 101 MOS C10 pp. 97-99; CASA Pack Right lithium battery guidance and AC 101-03 v2.0 Appendix C checked 2026-05-19.
Next step after study
Complete your Remote Pilot Licence training
The free study guide is a strong theory foundation. To actually be issued with a RePL, students still complete approved training, practical flying and assessment with a certified provider.
Unit MOS coverage
REES item 1: Electrical and electronic terms
Priority B - Part 101 MOS C10 Schedule 4 Unit 4 Item 1
REES item 2-3: Function of electrical components and RPA systems
Priority A - Part 101 MOS C10 Schedule 4 Unit 4 Items 2-3
REES item 4-6: Batteries, charging, capacity and ratings
Priority A - Part 101 MOS C10 Schedule 4 Unit 4 Items 4-6
REES item 7-9: GPS, electromagnetic radiation, EMI and signal hazards
Priority A - Part 101 MOS C10 Schedule 4 Unit 4 Items 7-9
REES item 4-6: Battery capacity, ratings, charging and battery management
Priority A - Part 101 MOS C10 Schedule 4 Unit 4 Items 4-6
RKOP item 1-4: Operational risk controls, pre-flight checks and records
Priority A - Part 101 MOS C10 Schedule 4 Unit 6 Items 1-4