What Yolog is

Yolog is a maintenance logbook for aircraft owners. It replaces the paper airframe, engine and propeller logbooks with digital ones that your mechanic signs online, and it keeps track of what’s coming due.

It isn’t a pilot logbook. It doesn’t track your flight time or currency. It tracks the aircraft: inspections, repairs, alterations, ADs and the hours on the airframe, engine and prop.

The core ideas

One logbook per component

When you add an aircraft, Yolog creates the same set of books you’d keep on paper: an Airframe logbook, plus an Engine and a Propeller logbook for each engine. A twin gets an engine book and a prop book for each side. Every entry lives in the book it belongs to, and you can search across all of them at once.

Signed entries are locked

When a mechanic signs an entry, it’s sealed and locked. Nobody can edit it or delete it afterwards, not you, not the mechanic, and not Yolog. If something in a signed entry is wrong, the fix is a new entry of type Correction to prior entry, signed by a mechanic. The original stays exactly as it was, and the correction sits alongside it in the record.

This is how paper logbooks are supposed to work too: you don’t erase a signed entry, you add a new one.

Mechanics sign through a link

Your A&P or IA doesn’t need an account. When work is done, you send them a signing link. They open it on their phone or computer, fill in the work performed, and sign with their certificate number. Yolog checks the certificate number against the FAA Airmen Registry at signing time. Signing links stay live until the entry is signed, unless you set a cutoff date, and you can cancel one at any time.

Mechanics who sign a lot can also set up a free shop account to see everything they’ve signed and the requests waiting on them.

Owners, co-owners and members

Each aircraft has one owner. The owner can invite:

• Co-owners, who can do nearly everything the owner can, such as requesting signed entries and importing paper logbooks.
• Members, who can view the logbooks and do only what the owner allows: log hours readings, add and manage squawks, or upload documents.

A few things stay with the owner alone, like transferring ownership and deleting documents. See Co-owners and members for the details.

Your paper history comes along

Most aircraft have decades of paper records. You can scan each paper logbook to a PDF and upload it. Yolog reads every page and drafts the entries, and you check each one against the scan before anything is filed. Imported entries are marked as coming from a scan, so nobody mistakes them for entries signed on Yolog.

Compliance tracking

Yolog keeps a list of recurring items for your aircraft, like the annual inspection, ELT, transponder and oil changes, and works out when each is due from your logbook entries and hours. It also matches Airworthiness Directives to your aircraft. Tracking starts once you tell Yolog your paper records are fully imported, so the due dates are based on the complete history.

The owner is still responsible for the aircraft’s records and airworthiness under 14 CFR 91.405 and 91.417. Yolog helps you keep track; it doesn’t replace your mechanic’s judgment or your own.

How records stay permanent

Every signed entry is sealed with a cryptographic signature and linked to the entry before it, forming a chain. If anyone changed an old entry, the chain would no longer check out. You can give a buyer, insurer or inspector a public verification link so they can confirm the records themselves. Verifying records explains how that works.

Where to start

If you’re an owner setting up your first aircraft, these guides follow the setup steps in order:

1. Signing in
2. Add your aircraft
3. Starting hours
4. What to track
5. Scan your paper logbooks
6. Review and apply your scanned entries

Then, when your mechanic finishes some work, request a signed entry.

If you’re a mechanic, start with Signing an entry and Your mechanic shop account.