Frequently asked questions

An EASA Part-FCL pilot logbook for iPhone. You log your flights, track your validities, your instructor signs your lines, and you export a complete logbook as a PDF — in the paper layout. What makes it different: everything happens on your phone. No account, no password, no server holding your logbook.

Any pilot keeping an EASA logbook: students, private and professional pilots, instructors, examiners. Aeroplanes for now.

You open the app and you are in your logbook. Nothing to create, nothing to remember. Your logbook is copied to YOUR iCloud account for backup — ours does not exist, and we have no access to it.

Sillage will be bought once and be yours — no subscription. The amount is not set yet; it will be announced at launch.

Sébastien Laus, a working flight instructor, as a natural person (BCE 0869.790.387).

Yes. FCL.050 requires a reliable record of flights, not a particular medium. Columns follow AMC1 FCL.050 and the PDF export reproduces the paper layout, page by page, with its carried-forward totals.

Your call, and ours is not to force anything: the Sillage PDF prints and presents as is. Many pilots keep paper while they build confidence — that is reasonable, and the export exists for exactly that.

It computes night time from the departure aerodrome's twilight, fills in the model and type from the registration, and checks the line for consistency: sixteen rules, each with its severity. When something is off, the field turns red and the screen jumps to it — it refuses what is impossible and flags what is unusual, never the other way round.

No. The reference data is inside the app, not cached: 19,277 ICAO aerodromes, 48,053 registrations, 1,468 type designators. You log, sign and export in a hangar with no coverage.

You carry your totals forward: one sum, one date, and your gauges start from your real hours. Reading an old logbook page by page is in preparation; it is not available yet. It will be the only function of the app that goes through a server — reading a photo needs a text-recognition model, and that does not fit in a phone. The image passes through without being kept, and typing by hand always remains possible.

No, and that is deliberate: the logbook records what you declare, it does not arbitrate your career. It warns you when a date approaches and computes your gauges (passenger recency, SEP revalidation), but the decision stays yours and your instructor's.

On your screen, the old-fashioned way: their initials, their name, their licence number. You are side by side, it takes ten seconds. As they sign, your iPhone seals the exact content of the line.

It changes nothing: it is your phone they use. They need no app, no account, no connection.

No. The signature seals the exact bytes of the line: changing a time afterwards breaks verification, and it shows. That is precisely what makes it probative — paper cannot do it.

Like with a paper logbook: you present your printed logbook, with each signer's name and licence number in plain sight. A printout is worth what paper is worth — no more, no less. The seal lives in the app: that is where you show a line has not moved since it was signed.

That the content of the line has not changed since it was signed, and that the act came from that device. It does not prove the person's identity: that is what the name and licence number are for — declarative, as on paper, and verifiable with the authority that issued the licence. We would rather say it than let you assume otherwise.

An instructor authorises the release before the flight, and the act lives on the student's phone: they show it without having to ask anyone. The wording writes itself in the logbook on the flight it covers.

On your phone, and nowhere else. We have no server holding logbooks, so no database to query, breach or sell. The app never calls us on its own initiative: the one time it leaves the phone is if YOU ask it to read a photo of a paper logbook — and nothing is kept from it (see the privacy policy). This site only exists to collect the addresses of those who want to hear about the launch.

Your logbook is copied to YOUR iCloud account. Delete the app, reinstall it: it comes back. We have no access to that content.

Then your logbook exists only on that phone, and losing it would lose the logbook. That is the assumed price of an app with no server, and we would rather write it here than let you find out: export your PDF and CSV regularly. The app also drops your exports into Files › Sillage, where they outlive it.

Your logbook keeps working: it is on your phone, the app needs nobody to run. Your PDFs and CSVs open without us. And nothing depends on us: there is no service to keep running for your logbook to keep working.

Yes, for a year — it was the project's test bench, and it has closed. Everything it could do now lives in the app, on your phone. This site keeps no logbook, no account and no flight data: it only exists to tell you about the launch.

Yes — that is where Sillage now lives. iPad included, with synchronisation through your own iCloud across your devices.

Not today. The logbook relies on the iPhone's secure chip to seal signatures; the equivalent exists on Android, but that is another undertaking. Leave your address if the subject interests you.

French and English, the whole app, following your iPhone's language. The PDF logbook is the exception: it follows the country of your licence — a Belgian licence produces an English logbook, because an authority will read it.