Terms of Service

Version 1.0 Effective date: June 1, 2026

1. Introduction & Acceptance

Welcome to PartFive — flight training and safety management for flight schools and individual instructors. These Terms of Service ("Terms") govern your access to and use of the PartFive platform, including the web application available at app.partfive.app, the marketing site at partfive.app, and any related services, APIs, or content we make available (collectively, the "Service").

The Service is operated by PartFive LLC, a Utah limited liability company ("PartFive," "we," "us," or "our").

By creating an account, accessing the Service, or clicking a button indicating acceptance, you ("User," "you," or "your") agree to be bound by these Terms and our Privacy Policy, which is incorporated herein by reference. If you do not agree, you must not use the Service.

If you are accessing the Service on behalf of a flight school, flight training organization, or other legal entity ("Organization"), you represent that you have authority to bind that Organization to these Terms. In that case, "you" refers to both you individually and the Organization.

2. Eligibility

To use the Service, you must:

The Service is intended primarily for use by individuals and organizations within the United States. Users outside the United States may access the Service but are responsible for compliance with their local laws. We make no representation that the Service is appropriate or available in locations outside the US.

Flight training organizations using PartFive as part of an FAA-approved training program remain solely responsible for ensuring that their use of the Service is consistent with their letter of authorization, training course outline, and applicable FAA regulations, regardless of the accuracy or completeness of data within the platform.

3. Account Types

PartFive supports several types of accounts, each with different levels of access and responsibility:

Organization Accounts

Flight Training Organization (Part 141 or Part 61): Accounts created by or for flight schools and training organizations — whether certificated under FAA Part 141 or operating under Part 61. These accounts include administrative access, full SMS workflow, student and instructor management, and audit-ready record retention features. Organizations are responsible for ensuring their use of the Service is consistent with whichever regulatory framework they operate under.

Independent CFI / Small Operator: Accounts for individual certificated flight instructors operating under Part 61, flight clubs, and small aviation businesses. These accounts provide training record management, endorsement workflow, and safety reporting tools scaled to individual-instructor operations.

Individual User Accounts

Within an organization, the following role-based account types exist:

Account roles are assigned by organization administrators and may be changed at any time by authorized personnel. PartFive is not responsible for incorrect role assignments made within an organization's account.

4. User Responsibilities

By using the Service, you agree to the following:

Accurate Data

You will enter only accurate, truthful, and current data into the Service. You understand that PartFive records — including endorsements, pre-flight assessments, stage check records, and safety reports — may be used as operational records by your organization, may be subject to FAA inspection, and may have legal or regulatory significance. Falsification of any such record is a violation of these Terms and may violate federal law.

Lawful Use

You will use the Service only for lawful purposes and in compliance with all applicable federal, state, and local laws and regulations. You will not use the Service to commit fraud, misrepresent qualifications, circumvent FAA regulatory requirements, or harm other users.

Account Security

You are responsible for maintaining the confidentiality of your account credentials and for all activity that occurs under your account. You will notify us immediately at hello@partfive.app if you believe your account has been compromised. PartFive is not liable for losses resulting from unauthorized account access that occurred because you failed to maintain credential security.

No Unauthorized Sharing

You will not share your account credentials with others, allow others to access the Service through your account, or create accounts on behalf of others without authorization. Organizations may invite multiple authorized users through the platform's invitation system.

Responsibility for Actions

You accept full responsibility for all actions taken under your account, including endorsements issued, reports filed, assessments signed, and content uploaded. Role-based access controls within the platform are a convenience feature — they do not relieve you of your individual professional and regulatory responsibilities.

5. Aviation-Specific Use Disclaimers

Read carefully. These disclaimers are central to how the Service is intended to be used. Aviation is a safety-critical activity. Misunderstanding the role of this software could have serious consequences.

PartFive Is a Record-Keeping and Workflow Tool

PartFive is designed to support the administrative and operational workflows of flight training organizations and individual instructors. It is a record-keeping and workflow management platform. It is not a substitute for pilot judgment, instructor qualifications, regulatory compliance programs, or the professional duties owed by certificated airmen and aviation organizations.

Regulatory Responsibility Remains with You

Use of PartFive does not satisfy, reduce, or alter any regulatory obligation under 14 CFR Part 61, Part 91, Part 141, Part 142, or any other applicable FAA regulation, ICAO standard, or aviation authority requirement. All regulatory responsibilities remain solely and exclusively with the user, the certificated instructor, the organization, and the relevant certificate holder — not with PartFive.

Endorsements Are the CFI's Responsibility

PartFive provides endorsement templates based on FAA Advisory Circular AC 61-65K for informational convenience. Certificated flight instructors (CFIs) are solely and exclusively responsible for the accuracy, validity, and appropriateness of any endorsement they issue — whether issued through PartFive or by any other means. PartFive does not verify CFI certificates, ratings, or authority. The issuance of an endorsement through this platform does not constitute validation by PartFive that the endorsement is legally correct or that the student meets the underlying regulatory requirements.

Training Program Compliance

Flight schools operating under FAA-approved training course outlines (TCOs) remain solely responsible for the content, administration, and compliance of their training programs. PartFive's curriculum and syllabus tools are aids to organization — they do not constitute FAA-approved materials, and they do not relieve the organization of its obligation to operate within its approved TCO.

Pilot-in-Command Responsibility

Pilots are solely responsible for currency, certification, aeronautical experience, and all operational decisions, including go/no-go decisions. PartFive's pre-flight risk assessment tool (PAVE model) is a structured self-assessment aid. It does not replace the pilot-in-command's responsibility under 14 CFR §91.3. A favorable risk score in PartFive does not authorize any flight.

Weather Data

Weather information displayed in PartFive (METARs, TAFs, PIREPs) is sourced from public aviation weather services and is provided for situational awareness only. PartFive does not guarantee the accuracy, currency, or completeness of weather data. Pilots must obtain official weather briefings from authorized sources (e.g., 1800wxbrief.com, an FAA AFSS, or other authorized weather service) before flight.

Nothing in the Service — including AI-generated text, templates, SMS manual content, SOP suggestions, endorsement language, or any other content — constitutes legal advice, regulatory advice, or a determination of compliance. All such content is informational only.

PartFive does not practice law. We are not your attorney. Regulatory determinations, legal interpretations, and compliance decisions require consultation with qualified legal counsel, FAA legal staff, the FAA's Flight Standards District Office (FSDO), or other appropriate authorities depending on the nature of the question.

AC 61-65K endorsement templates included in the platform reproduce FAA-published language for convenience. The FAA may amend or replace this advisory circular; users are responsible for verifying that any endorsement they issue references current and applicable guidance.

7. Data and Content

Your Content

You retain ownership of the data and content you submit to the Service ("User Content"), including training records, safety reports, endorsements, flight logs, and organizational documentation. By submitting User Content, you grant PartFive a limited, non-exclusive, royalty-free license to store, process, and display your User Content solely for the purpose of operating and improving the Service.

Authority to Upload

You represent and warrant that you have all necessary rights and authority to upload any User Content you submit, including data pertaining to other individuals (such as student records) that you upload or create on their behalf. You will not upload data about identifiable individuals without appropriate consent, organizational authority, or other legal basis.

No Ownership Claimed

PartFive does not claim ownership of your User Content. We do not sell your User Content to third parties. Our use of your data is governed by our Privacy Policy.

Accuracy

You are responsible for the accuracy of all User Content you submit. PartFive does not independently verify the accuracy of training records, endorsements, or other operational data entered by users.

8. Service Availability

The Service is provided on an "as available" basis. PartFive does not guarantee uninterrupted availability. The Service may be unavailable during planned maintenance windows, due to infrastructure outages, third-party service failures (including Supabase, hosting providers, and external data sources), or other events beyond our reasonable control.

We will make reasonable efforts to notify users of planned maintenance in advance. We are not liable for any loss, damage, or inconvenience resulting from Service unavailability, including inability to access training records, file reports, or issue endorsements during an outage.

Critical operations should not depend solely on PartFive's availability. Organizations should maintain backup record-keeping procedures consistent with regulatory requirements.

Note: PartFive does not currently offer a formal uptime service-level agreement (SLA). Organizations with critical record-keeping needs should maintain independent backups consistent with their regulatory obligations.

9. Modification and Termination

Modification of the Service

PartFive may modify, suspend, or discontinue any part of the Service at any time. Where reasonable, we will provide advance notice of material changes. We are not liable for any modification, suspension, or discontinuation of the Service.

Termination by PartFive

PartFive may suspend or terminate your access to the Service, with or without notice, for any violation of these Terms, any suspected fraudulent or illegal activity, or for any other reason at our discretion. Upon termination, your right to access the Service ceases. We will retain User Content as required by applicable law and as described in our Privacy Policy.

Termination by You

You may stop using the Service at any time. To request deletion of your account and data, contact us at hello@partfive.app. Data deletion is subject to applicable regulatory retention requirements — in particular, training records subject to 14 CFR Part 141.101 and endorsement records subject to 14 CFR §61.189 will be retained for the legally required periods even following account deletion.

10. Disclaimer of Warranties

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE," WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. PARTFIVE SPECIFICALLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, ACCURACY, RELIABILITY, COMPLETENESS, TITLE, QUIET ENJOYMENT, AND ANY WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OF TRADE.

PARTFIVE DOES NOT WARRANT THAT: (A) THE SERVICE WILL MEET YOUR REQUIREMENTS; (B) THE SERVICE WILL BE UNINTERRUPTED, TIMELY, SECURE, OR ERROR-FREE; (C) THE RESULTS OBTAINED FROM USE OF THE SERVICE WILL BE ACCURATE OR RELIABLE; (D) ANY DEFECTS IN THE SERVICE WILL BE CORRECTED; OR (E) THE SERVICE IS FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS.

NO ADVICE OR INFORMATION, WHETHER ORAL OR WRITTEN, OBTAINED BY YOU FROM PARTFIVE OR THROUGH THE SERVICE WILL CREATE ANY WARRANTY NOT EXPRESSLY STATED IN THESE TERMS.

11. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL PARTFIVE LLC, ITS MEMBERS, MANAGERS, EMPLOYEES, CONTRACTORS, OR AGENTS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, PUNITIVE, OR EXEMPLARY DAMAGES, INCLUDING LOST PROFITS, LOST DATA, LOSS OF GOODWILL, SERVICE INTERRUPTION, COMPUTER DAMAGE, SYSTEM FAILURE, AVIATION INCIDENT, REGULATORY ENFORCEMENT ACTION, OR THE COST OF SUBSTITUTE SERVICES, ARISING OUT OF OR RELATING TO YOUR USE OF OR INABILITY TO USE THE SERVICE, WHETHER BASED ON WARRANTY, CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY, OR ANY OTHER LEGAL THEORY, EVEN IF PARTFIVE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, PARTFIVE'S TOTAL CUMULATIVE LIABILITY TO YOU FOR ANY CLAIMS ARISING OUT OF OR RELATING TO THESE TERMS OR THE SERVICE SHALL NOT EXCEED THE GREATER OF: (A) THE AMOUNTS YOU PAID TO PARTFIVE IN THE TWELVE (12) MONTHS IMMEDIATELY PRECEDING THE EVENT GIVING RISE TO THE CLAIM; OR (B) ONE HUNDRED DOLLARS ($100.00) IF YOU ARE ON A FREE TIER OR HAVE MADE NO PAYMENTS.

SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF CERTAIN WARRANTIES OR THE LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES. IN SUCH JURISDICTIONS, PARTFIVE'S LIABILITY SHALL BE LIMITED TO THE MAXIMUM EXTENT PERMITTED BY LAW.

12. Indemnification

You agree to defend, indemnify, and hold harmless PartFive LLC, its members, managers, employees, contractors, and agents from and against any claims, liabilities, damages, losses, and expenses, including reasonable attorneys' fees and legal costs, arising out of or in any way connected with:

PartFive reserves the right to assume exclusive control of the defense of any matter subject to indemnification by you, in which case you will cooperate with PartFive in asserting any available defenses.

13. Intellectual Property

PartFive's Property

The Service, including all software, design, code, databases, user interface, trademarks, logos, trade names, and content created by PartFive, is the intellectual property of PartFive LLC and is protected by applicable copyright, trademark, trade secret, and other intellectual property laws. The "PartFive" name, wordmark, and airplane-needle logo are trademarks of PartFive LLC.

These Terms do not grant you any ownership interest in the Service. You may use the Service solely as permitted under these Terms and may not copy, reproduce, distribute, create derivative works of, or reverse engineer any part of the Service without our express written consent.

FAA Advisory Circular Content

Endorsement text templates based on FAA Advisory Circular AC 61-65K are reproduced from FAA public domain materials. The templates themselves are government-authored and not subject to PartFive's copyright. However, PartFive's presentation, formatting, integration, and editorial organization of those templates within the platform is proprietary.

Feedback

If you submit feedback, suggestions, or ideas about the Service, you grant PartFive an irrevocable, perpetual, royalty-free license to use and incorporate that feedback without obligation or compensation to you.

14. Governing Law

These Terms shall be governed by and construed in accordance with the laws of the State of Utah, without regard to its conflict of law provisions. Any dispute not resolved through the dispute resolution process described in Section 15 shall be subject to the exclusive jurisdiction of the state courts of Utah County, Utah, or the United States District Court for the District of Utah, and you consent to personal jurisdiction in those courts.

15. Dispute Resolution

Informal Resolution First

Before initiating any formal dispute, you agree to contact PartFive at hello@partfive.app and attempt to resolve the dispute informally. We will make good-faith efforts to resolve disputes promptly. If a dispute is not resolved within thirty (30) days of informal notice, either party may proceed to the process described below.

Resolution in Court

If a dispute is not resolved informally within thirty (30) days of informal notice, either party may bring the dispute before the courts identified in Section 14 (Governing Law), which shall have exclusive jurisdiction over the matter. Each party consents to personal jurisdiction and venue in those courts.

Exceptions

Notwithstanding the informal-resolution requirement above, either party may seek injunctive or other equitable relief in any court of competent jurisdiction to prevent irreparable harm pending resolution of a dispute, and either party may bring claims in small claims court if the claim qualifies.

16. Changes to Terms

PartFive may update these Terms at any time. When we make material changes, we will provide notice by posting the updated Terms to this page with a revised effective date, and where appropriate, by email notification to registered users. The date of the most recent revision will always be shown at the top of this page.

Your continued use of the Service after notice of changes constitutes your acceptance of the updated Terms. If you do not agree to updated Terms, you must stop using the Service and may request account deletion as described in Section 9.

17. General Provisions

Severability

If any provision of these Terms is held by a court of competent jurisdiction to be invalid, illegal, or unenforceable, that provision shall be modified to the minimum extent necessary to make it enforceable, or severed if modification is not possible, and the remaining provisions shall continue in full force and effect.

Entire Agreement

These Terms, together with the Privacy Policy and any additional terms applicable to specific features, constitute the entire agreement between you and PartFive with respect to the Service and supersede all prior agreements, representations, and understandings.

No Waiver

Failure by PartFive to enforce any right or provision of these Terms shall not constitute a waiver of future enforcement of that right or provision.

Assignment

You may not assign these Terms or any rights hereunder without PartFive's prior written consent. PartFive may assign these Terms in connection with a merger, acquisition, or sale of assets without your consent.

Contact Information

Questions about these Terms should be directed to:

Effective Date

These Terms are effective as of June 1, 2026.