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.

You open the app and you are in your logbook. Nothing to create, nothing to remember. If you turn on iCloud backup, your logbook is copied to YOUR iCloud account — 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 for the country of the flight, sets the aircraft's home base, and keeps pilot-in-command, dual or co-pilot time following the total until you touch them. It also checks the line for consistency: what is impossible is refused and named — a duration longer than the total, PICUS on a single-pilot aircraft —, what is doubtful is flagged, never the other way round.

No. The reference data is inside the app, not cached: 19,277 ICAO aerodromes, 48,053 registrations, 2,615 type designators. You log, sign, hand over a flight and export in a hangar with no coverage.

Two ways. Carry your totals forward: one sum, one date, and your gauges start from your real hours. Or import your old logbook: a CSV, text or XLSX file — including those exported by the most widely used logbook apps —, a scanned printed page or a screenshot. Everything is read on the phone, nothing is sent, and a grid shows you what needs correcting. Handwriting is not read: a hand-kept logbook is carried forward by its totals, or entered flight by flight.

Tap Record at engine start: recording continues with the screen off. After the flight, the track proposes the date, the airfields, the block times and the landings; you tap each line to accept it, and nothing is written without your gesture. It then illustrates your flight — replay on the map, profile, card to share —, but it never writes anything into the logbook on its own.

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, and your iPhone seals the exact content of the line. If they have Sillage, they can also receive the flight on their own phone and seal it with Face ID, with a key that never leaves the secure chip — the countersignature then comes back onto your flight.

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

With Side by side: the two phones close to each other, over Wi-Fi and Bluetooth, with no network and no account. A flight, a countersignature request and its return, a solo authorisation, one or several aircraft sheets. The screen says what is leaving and to whom, the other person always accepts, and nothing is lost if the link drops. What arrives is a copy: the two logbooks stay independent.

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.

You open “View my logbook”: your logbook as a PDF, full screen, with no network. Every countersigned line carries the instructor's name, licence and initials. If an authority asks for it, you hand them an export — everything, a period, or the most recent hours. Printed, a logbook is worth what paper is worth: a name and initials, no more, no less.

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.

The student sets the terms — local or cross-country, the day —, hands over the phone, and the instructor signs. One authorisation covers one solo, and it lives on the student's phone: they show it without having to ask anyone.

On your phone, and nowhere else. We have no server holding logbooks, and the app sends nothing to Sillage — ever, not even when it reads a page to import. The only services it uses are Apple's: iCloud for your private backup, Maps for the map backgrounds, Weather for the home-screen sky. This site only exists to collect the addresses of those who want to try the app or hear about its launch.

It is optional, and off to begin with: turn it on in the app's Settings, and 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 logbook regularly, or keep a complete copy somewhere other than the phone.

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 — that is where Sillage lives. The published version is for iPhone.

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, by choice or 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.