14 CFR Part 125 Compliance & Recordkeeping: The Large-Aircraft Operator's Guide

Last reviewed June 16, 2026 · By Chad Griffith

14 CFR Part 125 governs U.S.-registered airplanes with a seating configuration of 20 or more passengers, or a maximum payload capacity of 6,000 pounds or more, when common carriage is not involved. It applies to large private and corporate operators and requires an approved manual, a maintenance program, and records kept under Subpart L.

What is 14 CFR Part 125?

14 CFR Part 125 is the FAA rule set that governs the certification and operation of large U.S.-registered airplanes (and powered-lift) that are not flown for the public. Under 14 CFR 125.1, it applies to aircraft with a seating configuration of 20 or more passengers or a maximum payload capacity of 6,000 pounds or more, when common carriage is not involved. It fills the gap between Part 91 (general operating rules) and the air-carrier rules: an operator flying a large airplane privately — a corporate flight department running a former airliner, a sports team's aircraft, a university or research airplane — is too big for plain Part 91 but is not holding itself out to the public the way a Part 121 or Part 135 carrier does. Part 125 is the regime that catches those operations, imposing certificate, manual, maintenance, and recordkeeping requirements without the full air-carrier framework.

Who operates under Part 125, and who is excluded?

Part 125 applies to the operator of a qualifying large airplane in non-common carriage — flights not offered to the general public for compensation or hire. Typical Part 125 operators include large corporate flight departments, privately operated former airline aircraft, and similar private large-aircraft operations. Crucially, 14 CFR 125.1(b) states the part does not apply when the aircraft is required to be operated under Part 121, 129, 135, or 137. In other words, the moment an operation becomes common carriage or otherwise falls under an air-carrier or agricultural rule, that rule controls instead of Part 125. The determining test is the aircraft's size (20+ seats or 6,000+ lb payload) combined with whether common carriage is involved, not the type of business the operator is in.

How Part 125 differs from Parts 91, 121, and 135

The four parts sort large-airplane operations by how the aircraft is used:

• Part 91 — the baseline general operating and flight rules that apply to almost all civil aircraft, including most private and corporate flying. A large airplane operated privately can fall under Part 125's stricter regime on top of the Part 91 baseline.
• Part 121 — scheduled and large-aircraft air-carrier operations (the airlines). Heaviest requirements, including formal, FAA-approved training programs.
• Part 135 — commuter and on-demand air carriers (charter). Common carriage for compensation, but typically smaller aircraft and smaller passenger counts than Part 121.
• Part 125 — large airplanes (20+ seats or 6,000+ lb payload) flown in non-common carriage. It borrows several airline-style requirements (an approved manual, a structured maintenance and inspection program, recordkeeping) but, unlike Part 121, does not require a formal written training program for crewmembers, which meaningfully reduces the training-record burden.

The practical line is commerce and carriage: if you carry the public for hire you are likely Part 121 or 135; if you fly a large airplane privately, you are likely Part 125.

The Part 125 manual requirement (Subpart C)

Every Part 125 certificate holder must build and maintain an approved manual. Under 14 CFR 125.71 ("Preparation"), each certificate holder must prepare and keep current a manual setting forth the certificate holder's procedures and policies acceptable to the Administrator, and that manual must be used by its flight, ground, and maintenance personnel in conducting operations. 14 CFR 125.73 ("Contents of manual") sets out what the manual must contain. The manual is the operational spine of a Part 125 certificate: it documents how the operator meets each requirement, and inspectors check the operator's actual records against what the manual promises. Because the manual is “kept current,” revisions, distribution, and the proof that personnel are working from the current version are themselves part of the compliance record.

Part 125 maintenance and the records it generates (Subpart G)

Part 125 Subpart G requires a structured maintenance and inspection program. The key sections are 14 CFR 125.243 (certificate holder's responsibilities for airworthiness), 125.245 (the organization required to perform maintenance, preventive maintenance, and alterations), 125.247 (inspection programs and maintenance), 125.249 (maintenance manual requirements), and 125.251 (required inspection personnel). All maintenance, preventive maintenance, and alterations must be performed and recorded in accordance with 14 CFR Part 43, and an aircraft must be approved for return to service before it flies again. This program generates a continuous documentary trail — inspection sign-offs, airworthiness-directive compliance, life-limited-part status, and return-to-service entries — that the operator must be able to produce on demand.

Part 125 recordkeeping requirements (Subpart L)

Part 125's recordkeeping rules live in Subpart L, “Records and Reports” (14 CFR 125.401–125.411):

• 125.401 — Crewmember record: maintain current records showing each crewmember's compliance (proficiency checks, qualifications, medicals, flight time); records of an employment release or disqualification must be kept for at least 6 months.
• 125.403 — Flight release form: the required flight-release documentation.
• 125.405 — Disposition of load manifest, flight release, and flight plans: retain the original or a copy at the principal operations base for at least 30 days.
• 125.407 — Maintenance log: Airplanes: reported and observed failures or malfunctions, and the corrective or deferred action taken, recorded per Part 43.
• 125.409 — Service difficulty reports: reporting of mechanical reliability problems to the FAA.
• 125.411 — Airworthiness release or maintenance record entry: the certification that maintenance was completed and the aircraft approved for return to service.

Different records carry different retention clocks, so “we have it somewhere” is not the same as being able to produce the right current record, indexed to its rule, when an inspector asks.

The Letter of Deviation Authority (LODA) under 125.3

Not every large-airplane operator needs a full Part 125 operating certificate. Under 14 CFR 125.3 ("Deviation authority"), the FAA may, considering the circumstances of a particular operation, issue relief from specified sections of Part 125 in the form of a Letter of Deviation Authority (LODA). A request must be submitted to the responsible Flight Standards office not less than 60 days before the intended operations, and the FAA may amend or terminate a LODA at any time. A common path is an operator that holds a LODA to operate an otherwise Part-125-size aircraft under Part 91 rules instead. Even with a LODA, the operator remains bound by the terms and conditions of that authorization — which is itself a compliance document worth tracking, because it defines exactly which Part 125 requirements still apply.

Where Part 125 records readiness breaks down, and how FileFlo fits

For most Part 125 operators the difficulty is not flying the airplane — it is proving compliance on demand across a manual, a Part 43 maintenance trail, crewmember records, and the Subpart L records, each on its own retention clock. Records get scattered across hangar files, shared drives, and a maintenance-tracking system, and the gap that fails an inspection (a lapsed medical, a missing return-to-service entry, a load manifest outside its 30-day window) is usually the one nobody knew about. FileFlo is the records-and-proof layer for exactly this work: it reads each uploaded document, classifies it to its governing CFR citation, tracks expirations against the regulatory interval with 90/60/30/7-day alerts, flags records missing from the set you should hold, and exports an inspector-ready audit binder on demand. To be clear about scope, FileFlo is not your maintenance-tracking system, dispatch/flight-release system, or training provider — it organizes and proves the documents those systems and your operation generate. Starter $89/mo, Professional $299/mo, 5-day free trial (FileFlo is not SOC 2 certified).

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