A Part 141 instrument student's IFR long cross-country was interrupted after the aircraft failed three consecutive engine run-ups at the first fuel stop, raising a legitimate regulatory question about whether the flight can be completed on a subsequent day in a different Cessna 172. The student made the textbook airworthiness decision by refusing to depart in a malfunctioning aircraft — a decision that deserves emphasis regardless of what happens next with the training flight. The central regulatory question involves two distinct issues: whether a multi-day completion of a single cross-country flight satisfies the applicable requirements, and whether aircraft substitution mid-trip affects the logbook validity of the event.
Under 14 CFR 61.65, the instrument rating long cross-country requirement specifies a flight involving a total straight-line distance of more than 250 nautical miles, an instrument approach at each airport, and three different types of approaches using different navigation systems. Critically, the regulation does not require the flight to be completed within a single calendar day, nor does it specify that the same aircraft must be used throughout. The logbook entries, however, must accurately reflect the actual flights flown, and each leg must be documented with the correct tail number and date. For Part 141 students, the school's FAA-approved training course outline (TCO) is the governing document, and it may contain more specific language than Part 61 alone — the student should pull that document before assuming the more permissive Part 61 reading applies.
From a DPE perspective, the practical concern is whether the applicant can demonstrate that all required elements were actually accomplished and properly documented. A DPE reviewing the logbook will look for the approaches, the distances, and the instrument time, not necessarily a single continuous flight. Using a different Cessna 172 — same make, model, category, and class — is unlikely to raise red flags with a reasonable examiner, provided the student was endorsed and current in that aircraft under the school's TCO. Where applicants run into trouble is incomplete documentation or discrepancies between what the logbook shows and what the school's records reflect. The student should confirm with the chief flight instructor that the alternate aircraft substitution is formally approved through the school's operations, so the school's training records and the student's logbook remain consistent.
The broader lesson for any pilot operating under Part 141, Part 135, or Part 91K programs is that airworthiness decisions made in the field — particularly at remote airports away from home base — create downstream documentation requirements that must be handled proactively. A failed run-up that grounds a training flight needs to be captured in the school's maintenance records for the discrepant aircraft, and the continuation flight in the replacement aircraft needs proper release documentation. For professional operators, this kind of multi-leg, multi-aircraft scenario arises routinely in charter and corporate contexts, and the habit of keeping clean, accurate, aircraft-specific records from the beginning of one's training pays significant dividends when FAA scrutiny or legal exposure later becomes a factor.