Definition
To make a signed, dated, written entry in a pilot's logbook (or other approved record) certifying that the pilot has met a specific training, knowledge, or proficiency requirement set by the FAA. An endorsement is a formal authorization given by an instructor and carries legal and regulatory weight.
Plain English
To officially sign off a pilot in their logbook, confirming they are qualified or approved to do something specific — like fly solo, take a checkride, or operate a more complex aircraft.
Context Anchor
Seen when an instructor decides whether a student may be signed off for solo flight, a test, or another required training activity.
Derivation
From Latin in- (on) and dorsum (back). Originally meant 'to write on the back of' a document. The instructor's signature on the back or in the margin of a record became the formal mark of approval — which is exactly what a logbook endorsement still is today.
Why Pilots Care
An endorsement is a legal certification; without it a student may not legally perform solo flights, cross-country legs, or certain maneuvers even if they feel ready.
Intuition Check
Endorse does not just mean “agree with” or “say something positive about.” In aviation training, it means making a required written sign-off for a specific privilege or step.
Example Sentence 1
Before her first solo, the instructor had to endorse her logbook confirming she had completed the required training.
Example Sentence 2
Before the long cross-country, the CFI endorsed the logbook to authorize that specific training operation.