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100 Hour Inspection Checklist

Ensure airworthiness of aircrafts by streamlining 100 hour inspections with a mobile app

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What is a 100 Hour Inspection?

A 100 hour inspection is a type of maintenance assessment for commercial aircrafts under 12,500 pounds. This is performed after every 100 hours of flight time by an FAA (Federal Aviation Administration) certified A&P (Airframe and/or Powerplant) mechanic or by the aircraft manufacturer. 100 hour inspections are compliance requirements under FAR’s (Federal Aviation regulations) 91.409 to ensure the safety and airworthiness of an aircraft.

Annual Inspection VS 100 Hour Inspection

100 hour inspections and annual inspections are often mistaken for one another. Though their general scope may be similar, there are a number of differences that separate the two. Below are key differences that distinguish annual inspections from 100 hour inspections:

  1. WHO performs the inspection
    Only certified A&P mechanics with an inspection authorization can perform an annual inspection. However, no special inspection authorizations are necessary to conduct a 100 hour inspection.
  2. WHEN to perform
    100 hour inspections are performed after every 100 hours of flight time which means it may be performed more than once per year. Annual inspections, however, are required to be conducted every 12 calendar months regardless of total flight time.
  3. WHAT the inspection covers
    Annual inspections and 100 hour inspections may have the same inspection scope and detail, but they differ in terms of regulatory requirements. Tasks such as inspecting components attached to the engine like propellers, magnetos and carburetor should be accomplished annually, while others like checking and adjusting fuel pressures and brakes are to be accomplished each 100 hours.

Sustaining Airworthiness with a Digital Checklist

According to FAA 14 CFR 43.15(c)(1), checklists are required when performing 100 hour inspections. A good inspection checklist is essential to the evaluation of an aircraft’s airworthiness. Make your aircraft inspections efficient and less time-consuming by replacing the traditional pen-and-paper checklist with a digital smart form.

iAuditor by SafetyCulture is a mobile inspection app that has helped aviation & transportation companies like London City Airport to efficiently conduct and track aircraft inspections. Comply with FAA and sustain airworthiness with a mobile app that allows you to:

  • Conduct detailed 100 hour inspections using efficient inspection templates you can create in minutes.
  • Ensure all aircrafts consistently complete required inspection and maintenance tasks through in-app scheduling and monitoring
  • Take and annotate photo evidence of notable issues to better communicate repair and maintenance needs
  • Escalate issues identified during the inspection with collaborative actions. Assign corrective tasks to team members then set priority levels and due date to easily triage concerns
  • Generate comprehensive reports and automatically send to key stakeholders for streamlined data-sharing
  • Keep your 100 hour inspection reports secure in one place. Inspection reports are saved and secured via unlimited cloud storage for easy documentation and access


Jai Andales

SafetyCulture staff writer

Jai is a content writer for SafetyCulture based in Manila. She has been writing well-researched articles about health and safety topics since 2018. She is passionate about empowering businesses to utilize technology in building a culture of safety and quality.