Solo Endorsement Requirements: What CFIs Need to Know

Every solo flight a student makes (the first one, the fiftieth one, the 150-nautical-mile cross-country three weeks before the checkride) rests on a logbook endorsement you signed. 14 CFR 61.87 and 61.93 build that authorization out of several distinct sign-offs, each with its own trigger and, for two of them, its own 90-day clock. Miss one, and the student isn't legally solo, regardless of how ready they actually are. Here's the full sequence, in the order it actually happens.

The Two Sign-Offs Before Any Solo Happens

Before a student pilot can leave the pattern alone the first time, §61.87 splits the prerequisite into two pieces, and AC 61-65K gives each its own endorsement.

Pre-solo aeronautical knowledge (§61.87(b), A.3). The test itself doesn't have to be written by the instructor: stock pre-solo knowledge tests are widely available, and most schools use one of their own. What §61.87(b) requires is that the student's authorized instructor administers the test and reviews every incorrect answer with the student before the solo endorsement is signed.

Pre-solo flight training (§61.87(c)–(m), A.4). Logged training in the maneuvers the regulation lists for that category of aircraft (takeoffs and landings, traffic pattern work, slow flight and stalls, emergency procedures, and the rest) to a standard you judge satisfactory. There's no hour minimum here either. The regulation deliberately leaves readiness to your judgment, not a syllabus checkbox.

Neither of these two endorsements expires. Once issued, they don't need renewing for that student in that make and model; they're prerequisites, not authorizations with a clock.

The exact sentences AC 61-65K gives for both, and for the five other endorsements a Part 61 school writes most, are on the CFI endorsement wording page, with a free generator that fills in the names, dates, and make and model.

The First Solo Endorsement and the 90-Day Clock (§61.87(n), (p); A.6, A.7)

This is the endorsement that actually authorizes solo flight, and it's the one with a shelf life.

Note what the 90 days are measured from. §61.87(n) requires the endorsing instructor to have given the training within the 90 days preceding the flight, not to have signed within 90 days of it. The night endorsement below carries the same wording, and both are easy to get backwards on a student whose training and sign-off happened on different days.

Read the companion paragraph, §61.87(p), and the mechanism becomes clear: before authorizing solo, you must have trained the student in that make and model (or a similar one), determined they're proficient in the required maneuvers, determined they're proficient in that specific aircraft, and endorsed the logbook accordingly (AC 61-65K A.6). That endorsement "remains current for solo flight privileges, provided an authorized instructor updates the student's logbook every 90 days thereafter", which is where the renewal endorsement, A.7, comes from. A renewal isn't a formality: the same proficiency determination applies each time, even if it's a quick re-confirmation rather than a full training block.

The Pre-Solo Night Endorsement Runs Its Own Clock (§61.87(o), A.5)

Night solo is not covered by the day endorsement above; it's a separate requirement with its own three-part training standard and its own 90-day window. Before you can endorse a student for night solo, they need:

• Night flight training that includes takeoffs, approaches, landings, and go-arounds at night, at the airport where the solo will happen;
• Night navigation training in the vicinity of that airport; and
• A logbook endorsement for the specific make and model, from an instructor who gave that training within the preceding 90 days.

Because this endorsement's currency is defined by when the night training happened, the date that actually matters is the training date, not the date you get around to writing the endorsement, which is easy to get wrong because night training sessions often get logged and signed off days apart.

These 90-day clocks are also the reason a student pilot is the one person Part 61 excuses from the flight review: §61.56(g) exempts a student who is training toward a certificate and holds a current solo endorsement, on the logic that an instructor is already re-authorizing them every 90 days. The exemption ends at certificate issuance, and the new pilot starts a 24-calendar-month clock the same day (see Flight Review Requirements).

Solo Cross-Country: Several Endorsements, Not One (§61.93; A.8–A.11)

If the 90-day day/night endorsements are the ones schools track best, solo cross-country is the one they track worst, because it isn't one endorsement. §61.93 builds it out of several, and conflating them is the single most common paperwork gap on a pre-checkride file review.

When §61.93 Starts Applying, and Why It Is Not the 50-Mile Rule

Before the endorsements, the threshold. A student pilot has to satisfy §61.93 before either of two things happens, and either one on its own is enough (§61.93(a)(1)):

Twenty-five nautical miles, or any landing away from home. Neither number is the one that decides whether the flight counts as cross-country time: the definition in §61.1(b) requires a landing more than 50 nautical miles from the original point of departure before the time credits a private, commercial, or instrument certificate. Two different thresholds doing two different jobs, and the gap between them is a real place to go wrong. A student soloing to a field 30 nautical miles away needs the full §61.93(c) endorsement set signed before the flight, and logs no solo cross-country time toward §61.109(a)(5)(i)'s 5 hours when they get back. The endorsement is required and the credit is not earned, on the same flight.

The one-time cross-country endorsements (§61.93(c)(1)–(2), A.9.) Before any solo cross-country privileges exist at all, a student needs an endorsement for the aircraft category and a separate one for the specific make and model, both following ground and flight training on cross-country planning, navigation, and procedures. This establishes that the student is generally trained and proficient for cross-country flight; it does not authorize any specific flight.

The per-flight endorsement (§61.93(c)(3), A.10.) For every individual solo cross-country flight, an instructor has to review that day's specific planning (route, weather, fuel, performance) and sign the logbook confirming the planning is correct and the student is prepared to fly it safely under the conditions expected that day. This is the endorsement that's easy to forget precisely because it's required so often: once per flight, not once per student.

The narrower local-solo endorsements (§61.93(b), A.8 and A.11). Two exceptions sit outside the cross-country sequence above. A.8 covers solo practice takeoffs and landings at another airport within 25 nautical miles, after training over that specific route. A.11 covers repeated solo flights to a specific airport within 50 nautical miles: trained and endorsed once, these can be flown again and again without a fresh per-flight sign-off each time, unlike ordinary solo cross-country under (c)(3).

Once a student holds a private certificate, most schools see them back for the instrument rating under §61.65, and often the commercial certificate under §61.129 after that: a different set of hour floors, with none of the solo-endorsement framework above.