FAR 91.103 Preflight Action: What Every Pilot Must Know Before Every Flight

FAR 91.103 preflight action requires every pilot in command to review all available information before a flight and forms the legal foundation for safe and compliant planning. This includes evaluating weather reports and forecasts, NOTAMs, known ATC delays, runway lengths, fuel requirements, alternate airports, and takeoff and landing performance data, often organized using the NWKRAFT framework. By following this regulation, pilots assess current conditions, identify hazards, and prepare for contingencies to ensure safe flight operations.

Using NWKRAFT alongside tools such as 1800wxbrief.com, electronic flight bags, AviationWeather.gov, FAA NOTAM tools, and POH/AFM data helps pilots systematically verify critical information. A consistent routine with checklists, fixed planning sequences, and proper time allocation prevents common mistakes like skipping NOTAMs, misjudging weather, or underestimating fuel needs. This structured approach improves situational awareness, supports better decision-making, and ensures pilots remain fully compliant with FAR 91.103 while maintaining a high standard of flight safety.

What Is FAR 91.103?

FAR 91.103 (Preflight Action) is the federal aviation regulation that mandates every pilot in command (PIC) to become familiar with all available information regarding a flight before departure. This rule forms the legal foundation for preflight planning, ensuring that pilots evaluate critical factors such as Notices to Air Missions (NOTAMs), current weather conditions, known ATC delays, airport runway lengths, fuel requirements, and takeoff/landing performance data for all flights forming the NWKRAFT framework, plus alternatives for IFR or cross-country flights.

By adhering to FAR 91.103, pilots identify potential hazards, anticipate operational challenges, and establish contingency plans, significantly reducing the risk of accidents or delays. This regulation not only reinforces safety but also ensures legal compliance, supporting consistent, informed decision-making that keeps both the aircraft and crew prepared for any conditions encountered during the flight.

How NWKRAFT Helps You Comply With FAR 91.103?

NWKRAFT helps pilots comply with FAR 91.103 by providing a structured framework to cover all preflight elements, including Weather, NOTAMs, Known ATC delays, Alternate airports, Fuel requirements, and Takeoff/Landing distances. This mnemonic ensures pilots systematically gather and verify essential information, reducing the risk of oversight while enhancing operational safety. By using NWKRAFT, pilots can efficiently complete preflight preparations, anticipate potential hazards, and make informed decisions that support both regulatory compliance and overall flight readiness.

NOTAMs (Notices to Air Missions)

NOTAMs are essential time-critical notices that provide pilots with vital information regarding temporary changes or hazards in the National Airspace System, such as runway closures, out-of-service navigation aids, or temporary flight restrictions. Reviewing these notices is mandatory under FAR 91.103 because they contain operational data that is not yet published on aeronautical charts but is critical to flight safety. 

Pilots stay informed by searching for NOTAMs relevant to their specific route and destination, ensuring they are aware of hazards like tall obstacles or restricted airspace before takeoff. Failing to review NOTAMs can lead to dangerous situations, including attempting to land at a closed airport or inadvertently violating restricted airspace. This step is a fundamental component of preflight action, ensuring a pilot is fully prepared for current airspace conditions.

Weather Reports and Forecasts

Pilots primarily use weather reports and forecasts to assess whether a flight can be conducted safely, which provide detailed data on wind speed, visibility, precipitation, and cloud cover. FAR 91.103 explicitly requires pilots to review weather information for any flight outside the local airport vicinity, making this assessment a cornerstone of legal compliance. Accurate weather data allows pilots to evaluate how atmospheric conditions will impact their route, fuel consumption, and the viability of their destination or alternate airports. 

By reviewing both current METARs and forecast TAFs, pilots can anticipate hazards such as turbulence or icing and make informed go/no-go decisions based on the aircraft's capabilities. Thorough weather planning is an indispensable safety precaution that prevents pilots from encountering unexpected and dangerous meteorological conditions during flight.

Known ATC Delays

Knowing about Air Traffic Control (ATC) delays before departure is important because these traffic management initiatives can significantly alter flight schedules, routing, and fuel endurance. Pilots can check for known delays using resources such as the FAA’s status reports or flight briefing services, allowing them to make informed decisions about departure times and potential rescheduling. 

Identifying these delays during the preflight phase helps pilots comply with FAR 91.103 by making them fully aware of any system constraints that could affect flight timing or safety. Practical steps to mitigate these delays include coordinating with ATC for alternative routing or adjusting fuel loads to account for potential holding time. Staying informed about the air traffic environment ensures a smoother operation and prevents the stress and hazards associated with unexpected congestion or diversions.

Runway Lengths

Runway length is a safety factor that determines if an aircraft can safely execute a takeoff or landing given the current aircraft weight, airport altitude, and weather conditions. Pilots are required under FAR 91.103 to verify that the available runway at their departure and arrival airports is sufficient for their specific aircraft performance. This assessment involves calculating the required distance based on factors like density altitude and wind, as high temperatures or tailwinds can dramatically increase the space needed to operate safely. 

By checking these lengths during preflight planning, pilots ensure they are operating within the physical limits of the infrastructure and the aircraft's capabilities. Accurate runway length data is essential to prevent overruns and ensure the aircraft can safely clear obstacles during the initial climb or final approach.

Alternate Airports

Serving as a critical safety buffer, alternate airports provide a pre-planned destination to land if the primary airport becomes unavailable due to weather, runway closures, or mechanical emergencies. FAR 91.103 mandates that pilots consider alternate airports during preflight action to ensure they have a viable contingency plan before the flight begins. 

Selecting a proper alternate involves evaluating the distance to the destination, current weather forecasts, and available facilities to ensure the airport can accommodate the aircraft. Integrating these backups into the flight plan provides operational flexibility and ensures the pilot is never left without a safe landing option in the event of unforeseen disruptions. Establishing a Plan B is a hallmark of professional flight planning and a primary step in maintaining a high margin of safety throughout the mission.

Fuel Requirements

Calculating fuel requirements is a vital preflight task that ensures a pilot has enough fuel to reach the destination, fly to a required alternate, and still maintain a specific safety reserve for contingencies or holding. These calculations must account for the planned distance, aircraft weight, and forecast winds, as headwinds can significantly increase fuel burn and reduce endurance. 

Compliance with FAR 91.103 requires pilots to verify that these fuel needs are met before every flight, preventing the dangerous and avoidable risk of fuel exhaustion. Pilots must also factor in the specific fuel reserves required by regulations for both VFR and IFR operations to maintain a legal safety margin. Proper fuel planning ensures that the aircraft remains prepared for unexpected rerouting or delays without compromising passenger or crew safety.

Takeoff and Landing Distances

Knowing the exact takeoff and landing distances is essential to ensure an aircraft can safely operate within the available runway length under current environmental conditions. Pilots assess these distances by using performance charts from the Pilot Operating Handbook (POH), factoring in aircraft weight, pressure altitude, temperature, and runway surface conditions. FAR 91.103 requires this technical verification to ensure the aircraft is capable of safe operation, particularly when departing from high-altitude airports or short fields. 

These calculations provide the pilot with the specific data needed to confirm that the aircraft will clear all obstacles and come to a stop safely after landing. Mastering these performance calculations is a safeguard to ensure the flight is conducted within the aircraft's established safety margins.

Common Preflight Planning Mistakes Pilots Make

Common preflight planning mistakes pilots make include rushing through NOTAMs, inadequate weather briefings, skipping performance calculations, underestimating fuel needs, and flying VFR with no alternate. These errors often arise from neglecting thorough planning or relying solely on memory, which can compromise safety and violate FAR 91.103. By following a structured preflight routine and using tools like checklists, flight planning software, or pre-tabbed FAR/AIM resources, pilots can avoid these mistakes and ensure safe, compliant flight operations.

5 common preflight planning mistakes pilots make are:

1. Skipping or Rushing Through NOTAMs

Skipping or rushing through NOTAMs is a dangerous oversight that leaves pilots unaware of critical airspace restrictions, runway closures, or hazardous obstacles that could compromise flight safety. To remain compliant with FAR 91.103, pilots must thoroughly review these notices using official flight briefing services or aviation apps to identify any temporary operational changes before takeoff.

2. Only Checking Local Weather, Not the Full Route

Relying solely on local weather reports is a high-risk mistake because it ignores unpredictable conditions such as turbulence, thunderstorms, or low visibility that may occur along the entire flight path. Under FAR 91.103, pilots are required to assess weather along the entire route, including the destination and alternate airports, to ensure the aircraft can safely navigate every phase of the journey.

3. Skipping Performance Calculations

Neglecting performance calculations for takeoff and landing distances can result in operating the aircraft beyond its safe physical limits, especially at high density altitudes or in adverse weather. Pilots must use aircraft performance charts to verify that the plane can safely clear obstacles and stop within the available runway length, ensuring full regulatory compliance and operational safety.

4. Underestimating Fuel Needs

Underestimating fuel requirements can lead to dangerous mid-flight shortages that force unscheduled landings or emergency diversions, directly violating the fuel reserve mandates of FAR 91.103. Accurate fuel planning must factor in aircraft weight, forecast headwinds, and the fuel necessary to reach a designated alternate airport plus a dedicated safety reserve.

5. Flying VFR With No Alternate in Mind

Flying under Visual Flight Rules without a pre-planned alternate airport is a risky practice that leaves a pilot unprepared for sudden weather deterioration or unexpected airport closures. Even when not strictly required by weather minimums, identifying a "Plan B" airport is a vital safety precaution that fulfills the contingency planning requirements of FAR 91.103.

Common Methods to Fulfill Preflight Action

Methods to fulfill preflight action (FAR 91.103) involve calling 1800wxbrief.com, using an electronic flight bag (EFB), self-briefing through AviationWeather.gov, utilizing FAA NOTAM search tools, and reviewing the POH/AFM. These approaches provide pilots with comprehensive, up-to-date information on weather, airspace restrictions, and aircraft performance, ensuring that all preflight requirements are met. Combining these methods into a consistent routine helps pilots reduce errors, maintain regulatory compliance, and make informed, safety-focused decisions before every flight.

Below are 5 common preflight action methods:

1. Calling 1800wxbrief.com for a Standard Weather Briefing

Calling 1800wxbrief.com connects pilots with certified briefers who provide tailored weather reports, TFRs, and NOTAMs essential for meeting the requirements of FAR 91.103. This service is highly reliable because it allows pilots to ask specific questions about their route and receive a professional interpretation of complex meteorological data.

2. Using an Electronic Flight Bag (ForeFlight or Garmin Pilot) for Logged Briefings

Electronic Flight Bags like ForeFlight or Garmin Pilot streamline preflight planning by integrating real-time weather, digital charts, and NOTAMs into a single interface that logs briefings for legal compliance. These tools improve situational awareness by providing route-specific updates and easy access to historical flight data throughout the planning phase.

3. Self-Briefing Through AviationWeather.gov

AviationWeather.gov provides pilots with direct access to official FAA weather data, including METARs, TAFs, and satellite imagery required for thorough preflight analysis. This self-briefing method enables a customized review of raw data, helping pilots visualize weather trends along their route to meet the requirements of FAR 91.103.

4. Utilizing the FAA NOTAM Search Tool

The FAA NOTAM Search Tool provides an official, real-time database where pilots can search for specific notices related to airport closures and airspace restrictions at their departure and arrival airports. Using this tool ensures that the pilot has reviewed the most current safety-related updates, supporting full regulatory compliance before beginning any flight.

5. Reviewing the POH/AFM for Performance Data

Reviewing the Pilot Operating Handbook (POH) or Aircraft Flight Manual (AFM) is a mandatory step for verifying that the aircraft can safely perform takeoff and landing maneuvers under current weight and weather conditions. This manual provides the specific performance charts and weight limits necessary to ensure the aircraft is operated within its certified safety margins.

How to Build a Consistent Preflight Planning Routine?

To build a consistent preflight planning routine, pilots must follow a structured process to ensure all FAR 91.103 requirements are met, including reviewing weather reports, NOTAMs, fuel requirements, alternate airports, and aircraft performance data. A consistent routine improves situational awareness, prevents missed steps, and supports safe, compliant flight operations. By using checklists, flight planning tools, and dedicated review time, pilots can standardize their workflow, reduce errors, and maintain a reliable safety margin before every flight.

Step-by-step guide to build a consistent preflight planning routine includes:

1. Start Your Preflight Planning at Least 30 Minutes Before Departure

Beginning the preflight process at least 30 minutes before departure provides the necessary time to thoroughly evaluate weather trends, NOTAMs, and aircraft performance without the dangerous pressure of a ticking clock. This window allows a pilot to identify and mitigate potential risks, such as unexpected TFRs or deteriorating visibility, ensuring full compliance with FAR 91.103.

2. Follow a Fixed Order Every Flight and Don't Rely on Memory

Adopting a fixed, systematic order for preflight tasks ensures that no critical steps, such as fuel verification or alternate airport selection, are overlooked due to distractions or fatigue. Relying on a structured sequence rather than memory alone maintains a high standard of focus and ensures every regulatory mandate is addressed in a logical and repeatable manner.

3. Use a Preflight Planning Checklist or Dispatch Sheet

Using a dedicated preflight planning checklist or dispatch sheet standardizes the preparation process and provides a physical record that all essential safety checks have been completed. These tools act as a final safeguard against human error by organizing complex data points into a clear format that supports total regulatory compliance and operational readiness.

4. Keep a Pre-Tabbed FAR/AIM for Quick Regulation Reference

Maintaining a pre-tabbed FAR/AIM significantly improves planning efficiency by allowing immediate access to critical regulations concerning weather minimums, fuel reserves, and flight safety. Quickly locating specific guidance within pre-tabbed FAR/AIM manuals ensures that pilots remain compliant with FAR 91.103 without wasting valuable time searching through hundreds of pages of regulatory text.