Debriefing flight training: what recording the flight changes

Why memory is a poor debriefing tool

A training flight lasts an hour; the debrief is about the three minutes that did not go to plan — the flare, the go-around, the engine-failure drill. By the time the aircraft is tied down, the student remembers the stress and the instructor remembers what they said. Neither remembers the airspeed at the moment the nose came up, and the student can leave convinced of something that did not happen.

A recording changes the conversation. Stop the replay on the flare: here is the view from the cockpit camera, here is the airspeed, here is the vertical speed, here is what was said on the intercom. The discussion moves from who remembers better to what the aircraft actually did — which is the whole point of a debrief.

It changes the instructor's work as well. A point that took ten minutes to explain on a whiteboard takes thirty seconds on the replay, and the student sees for themselves the drift they were told about in flight.

What to record

Four kinds of information, and one requirement: they must share the same clock.

• Video. A cockpit camera that sees both the panel and the windshield is the most useful single channel: it shows the view outside, the hands, and the instruments the student was — or was not — looking at. A second camera outside earns its place for landing training.
• Audio. Intercom and radio, plus an area microphone for what is said without pressing a button. The instructor's call and the student's reaction are part of the lesson.
• Flight parameters. Attitude and rates, load factor, altitude and airspeed, engine parameters where they are available — and rotor speed on a helicopter.
• Position. A GPS track to replay the circuit, the approach or the navigation exercise on a map.

Twenty well-chosen parameters are plenty for training; a debrief does not need the hundreds a test campaign records. What it cannot do without is alignment: a replay in which the image and the airspeed are half a second apart teaches the wrong lesson with great conviction.

Where the parameters come from on a light aircraft

A recent trainer with a glass cockpit publishes most of what matters on a data bus — ARINC 429 on many of them — down to the GPS position, carried in its own label. The recorder simply listens. An older aircraft with analogue instruments publishes nothing. That is still the common case in flying clubs, and it does not rule out recording.

The recorder then measures what it can by itself: a three-axis gyro and a load-factor sensor give the rates and the g, a pressure sensor gives altitude, a GPS receiver — in the recorder or in the camera — gives position and ground speed. What the internal sensors cannot measure, the camera films: the airspeed indicator, the engine gauges. The replay puts both side by side.

Installation decides

On a certified aircraft, anything permanently fitted — recorder, camera, antenna — is a modification that has to be approved, and its weight, power consumption and electromagnetic behaviour have to be known. That is why mass and qualification weigh as much as features in the choice: a unit of about three kilograms, qualified to DO-160 and delivered with the evidence an approval needs, is an installation a maintenance organisation can carry out. A consumer camera stuck to the canopy is not an installation at all.

Power, space and wiring are the practical limits on a light aircraft. One box that acquires, records audio and video and carries its own sensors keeps the installation to a unit, a camera and a few cables — often the difference between a project that happens and one that stays on paper.

For a manufacturer of training aircraft the question is simpler: the recorder becomes part of the type definition, fitted on the line with a single qualification, and offered in the catalogue to the schools that want it.

Why crash protection matters to a school

A training fleet flies a lot, often with inexperienced pilots, often solo. Nearly always, the recording serves the debrief. Occasionally it serves an investigation — and then only a recording that survived is of any use. EUROCAE ED-155 is the standard written for lightweight flight recorders: it defines how data, audio and images must survive impact, fire and immersion, in a unit light enough for small aeroplanes and helicopters.

One box doing both jobs is also the economical answer. The recording the instructor replays on Tuesday is the one that answers the investigators if Wednesday goes wrong. A debriefing camera on one side and a recorder on the other mean two installations, two sets of evidence and two clocks that may not agree.

Following a solo flight live

A recorder answers questions after landing. A school sometimes wants answers during the flight — where is the student on a first solo cross-country, and is everything nominal? A recorder that streams its data over Ethernet can feed a satellite terminal, such as a low-orbit Starlink terminal: position and a few parameters reach the ground in near real time, while the complete recording stays on board. It takes an antenna, a subscription and, once again, an approved installation.

Making the debrief work

• Debrief with the recording, not instead of the instructor. The replay supports the points being made; it does not replace the conversation.
• Go straight to the event. Find it in the parameters — the touchdown load factor, the lowest airspeed on approach — rather than scrolling through the cruise.
• Show the same views every time. A saved layout — cockpit video, map, attitude, airspeed — makes one lesson comparable with the next and lets the student see their progress.
• Let students replay their own flights. Going over a lesson again at their own pace is where a good share of the learning happens.

Who sees the recordings

The quickest way to ruin a debriefing system is to use it to sanction. Students who fear that a replay will be held against them stop flying to learn and start flying not to be caught out — overcautious, tense, afraid to try anything, which is exactly when they stop making progress. Schools that make it work set the rules before the first flight: recordings serve training, are opened by the student and their instructors, are kept for a stated period, and are used for anything else only in circumstances everyone agreed in advance. Airlines have applied the same principle to flight data monitoring for years.

Recordings are also personal data about the student and the instructor, which is one more reason to keep them on site. A replay that runs entirely offline, on the school's own computers, sends nobody's flights anywhere — and makes those rules easier to write and to keep.