The background of this incident involves a complete electrical failure on a Cessna 172 during a night navigation training flight as part of a Commercial Pilot License (CPL) course.

1. Situation

The instructor and the student were on a night navigation training flight in a Cessna 172, practicing cross-country navigation, night landing techniques, and instrument flying.

The weather was clear with good visibility, light winds, and a full moon providing additional illumination.

Everything was proceeding smoothly until approximately halfway through the flight, when the aircraft's electrical system failed completely, leading to the loss of all electrically powered instruments, including the radio, navigation lights, and interior lighting.

2. Task

The task was to conduct a night navigation exercise, which included using both visual and instrument navigation techniques, communicating with ATC, and performing night landings at a series of predetermined airfields.

3. Action

Upon noticing the electrical failure, the instructor immediately took control of the aircraft and instructed the student to troubleshoot the issue.

The student checked the circuit breakers and battery switch, but the electrical system remained inoperative.

Recognising the seriousness of the situation, the instructor decided to return to the nearest airport, which was a small uncontrolled field within gliding distance.

The instructor communicated with the student using a flashlight to illuminate the instruments and a handheld transceiver for radio communication.

The instructor instructed the student to maintain altitude and heading while they navigated using dead reckoning and visual references.

The handheld transceiver was used to communicate their situation and intentions to any nearby aircraft on the common traffic advisory frequency (CTAF).

As they approached the uncontrolled airport, the instructor prepared for a no-radio, no-light landing.

The student was tasked with looking out for any potential obstacles on the ground and monitoring the approach path visually.

The instructor executed a precautionary approach, using the moonlight to help judge altitude and distance.

The landing was conducted safely using a power-off approach to minimise any risks associated with the electrical failure.

After touchdown, the instructor taxied the aircraft to a safe location and shut down the engine.

4. Result

The aircraft landed safely without further incident.

An inspection revealed that the alternator had failed, causing the battery to drain completely and resulting in the total loss of electrical power.

The debrief highlighted the importance of being prepared for electrical failures, especially during night flights.

The instructor praised the student's calm and methodical approach to troubleshooting and their effective use of the handheld transceiver for communication.

The key lesson learned from this incident is the importance of being prepared for an electrical failure, especially during night operations.

Pilots should ensure they have a reliable backup communication method, such as a handheld transceiver, and be proficient in dead reckoning and visual navigation techniques.

Regular training in emergency procedures, including dealing with complete electrical failures, is essential to ensure pilots can handle such situations safely and effectively.

This incident also emphasised the importance of thorough pre-flight checks of the electrical system and having contingency plans for unexpected equipment failures.

How to use this case responsibly

Separate the evidence from the teaching interpretation. First list only what the cited source or scenario actually establishes. Then list the assumptions that would need checking: aircraft variant, installed equipment, weather, runway state, pilot qualification, local procedures and the exact sequence of events. This prevents a memorable story from becoming an invented checklist.

Before the next relevant flight, turn one lesson into a concrete briefing item or decision gate and verify it against the current AFM or POH, official aeronautical information and operator procedures. If the case exposes a skill gap, rehearse it with a qualified instructor under suitable conditions. After the flight, record whether the warning sign appeared, whether the gate was usable and what should change next time.

For a group debrief, ask which decision was last easily reversible, which cue was available at that moment and what pressure encouraged continuation. Compare at least two safer alternatives and identify the new risks each would introduce. The aim is not hindsight blame; it is to build options early enough that the safest action remains practical.