UA.V.E.K5: Stress and fatigue.

ACS Area V — Operations Task E: Physiology References: ACAdvisory CircularCloseFAA guidance that explains acceptable ways to comply with rules or understand FAA procedures. 107-2; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-H-8083-2, FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-H-8083-25; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-G-8082-22

Key Concepts

Why Stress and Fatigue Matter Under Part 107 Responsibilities

Part 107 assigns the remote pilot in command specific, non-delegable duties that require clear judgment and attention to detail—conditions that personal stress and fatigue can undermine. When conducting operations over people, the remote pilot must determine the correct operational category, verify that the aircraft is properly labeled, and ensure it appears on an FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-accepted Declaration of Compliance (DOCDeclaration of ComplianceCloseManufacturer compliance document that matters for some Operations Over People categories.). The pilot should also complete all recommended preflight actions; these checks are your safeguard against oversight when workload or pressure is high ^[2]. Subpart D makes clear that operations over human beings are only permitted when the aircraft and operation meet § 107.110 (Category 1), §§ 107.115 and 107.120 (Category 2), §§ 107.125 and 107.130 (Category 3), or § 107.140 (Category 4), as applicable ^[4].

Know the category thresholds that require precise preflight verification. Category 1 requires a small unmanned aircraft that weighs 0.55 pounds or less on takeoff and throughout the operation, with no exposed rotating parts that would lacerate human skin; sustained flight over open-air assemblies is only permitted if the operation meets § 89.110 or § 89.115(a) ^[4]. Category 2 eligibility includes performance limits such that the aircraft will not cause injury equivalent to or greater than 11 foot-pounds of kinetic energy, must have no exposed rotating parts that would lacerate, and must be free of safety defects; it also requires a permanent Category 2 label and availability of operating instructions detailing system description, limitations, allowed modifications, and configuration procedures ^[5]. Staying mentally sharp helps ensure you actually confirm these details before flight.

Workload Hotspots Where Stress and Fatigue Can Show Up

Certain operations demand especially disciplined compliance. For operations not conducted within or over a closed- or restricted-access site, the small unmanned aircraft must not maintain sustained flight over any moving vehicle; only transient flight is permitted when persons in the vehicle are not directly participating ^[1]. Under pressure, it can be tempting to loiter; the rule allows “Transit Only, No Sustained Flight” in that scenario—know it and brief it before launch ^[1].

Night operations add complexity without changing the categories or restrictions for operations over people. If the aircraft is eligible for a given category by day, it can operate over people at night when the pilot meets §§ 107.29 and 107.39. Manufacturers declaring Category 2 or 3 eligibility for night ops may need to account for the mass of an anti-collision light in meeting the performance-based safety requirements—another item the remote pilot must understand from the aircraft’s documentation ^[2].

Some NASNational Airspace SystemCloseThe shared U.S. airspace system that drones must operate within. environments elevate external demands. UASUnmanned Aircraft SystemCloseAn unmanned aircraft plus its control station, communication links, and supporting components. operations conducted by public or civil operators via a Certificate of Waiver or Authorization (COACertificate of Waiver or AuthorizationCloseFAA authorization often used by public aircraft operators or special operations.) or special airworthiness certificate may require ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. coordination, are typically contained within specified geographic boundaries and altitudes, often require a NOTAMNotice to Airmen / Notice to Air MissionsCloseOfficial notice about temporary conditions, hazards, or changes that can affect a flight., and generally use observers to provide see-and-avoid and compliance with 14 CFRCode of Federal RegulationsCloseThe federal rulebook where Part 107, Part 89, Part 48, and other aviation rules live. § 91.113. At or above FL180Flight LevelCloseAltitude expressed using a standard pressure setting, mainly relevant to higher-altitude crewed aviation., UASUnmanned Aircraft SystemCloseAn unmanned aircraft plus its control station, communication links, and supporting components. operate under IFRInstrument Flight RulesCloseRules for operating primarily by instruments. On the exam, IFR often appears in weather, traffic, and airspace context., communicate with ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services., and must be appropriately equipped. These procedural layers can add time pressure and task loading—conditions where you must slow down and adhere to the plan ^[6].

Practical Controls to Keep Yourself in the Game

• Standardize your preflight. The remote pilot should perform all recommended preflight actions, confirm category eligibility, and verify the aircraft’s label and presence on an FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-accepted DOCDeclaration of ComplianceCloseManufacturer compliance document that matters for some Operations Over People categories. before launch. This single habit catches many errors that sneak in under stress or fatigue ^[2].
• Anchor to the rule text. Subpart D applicability (§ 107.100) and limitations (§ 107.105) point you to the exact category sections you must satisfy; reviewing these before complex missions helps prevent “rule drift” under pressure ^[4].
• Use official study and operational references. FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes. handbooks and manuals—such as the AIMAeronautical Information ManualCloseFAA operational guidance and glossary material used to understand aviation procedures and terminology., Pilot’s Handbook of Aeronautical Knowledge, Risk Management Handbook, and the Remote Pilot ACSAirman Certification StandardsCloseThe FAA task and knowledge taxonomy used to organize handbook topics and weak-area remediation.—are available online and provide structured guidance for human performance topics you’ll be tested on and must apply in the field ^[8].
• Respect numerical thresholds. Aviation procedures regularly include precise numbers that must be honored even when you’re tired. Examples from broader FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes. guidance include EFVSEnhanced Flight Vision SystemCloseA crewed-aircraft system that helps pilots see in low visibility under strict authorization rules. operational minima to 100 feet above the touchdown zone elevation under 14 CFRCode of Federal RegulationsCloseThe federal rulebook where Part 107, Part 89, Part 48, and other aviation rules live. § 91.176(b) ^[3], and a helicopter hot refueling practice that prohibits electrical storms within 10 nautical miles—illustrating how a single missed number can create unacceptable risk ^[7].
• Know when to stand down administratively. If you cannot meet the responsibilities of a remote pilot, § 107.79 allows voluntary surrender of your certificate for cancellation; the request must include a signed statement acknowledging that reissuance requires again meeting §§ 107.61 and 107.63 ^[4]. While a drastic step, it underscores the FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.’s expectation that only fit and prepared pilots exercise Part 107 privileges.

By organizing your workflow around these regulatory checkpoints and verified references, you create a buffer against the errors that stress and fatigue can invite, and you strengthen both exam performance and operational safety.