Conditions and concepts
Higher temperature and altitude generally reduce air density, which can reduce aircraft performance; numerical capability must come from the aircraft's applicable data. The remote PIC must consider local conditions and aircraft capability; supplied manufacturer limits are operational planning inputs, not universal FAA wind limits. Thunderstorms can bring gust fronts, turbulence, lightning and rapidly changing conditions; a single favorable observation does not establish a safe route. Temperature/dewpoint convergence, moisture and cooling may support fog; stability and visibility require actual local assessment rather than a single-code guarantee.
Worked decisions
A mission moves from a cool low-elevation field to a hot high-elevation site. What performance concern increases? Higher temperature and altitude generally reduce air density, which can reduce aircraft performance; numerical capability must come from the aircraft's applicable data. The supported result is Reduced air density can reduce available performance. A supplied aircraft manual limits operation to gusts no greater than 20 knots. Forecast site gusts are18 knots. Which comparison follows? The remote PIC must consider local conditions and aircraft capability; supplied manufacturer limits are operational planning inputs, not universal FAA wind limits. The supported result is The gust forecast is 2 knots below the supplied limit. A storm is approaching and surface winds begin shifting sharply near the site. Which concern is relevant? Thunderstorms can bring gust fronts, turbulence, lightning and rapidly changing conditions; a single favorable observation does not establish a safe route. The supported result is Gust-front and turbulence hazards. Temperature and dewpoint converge during evening cooling at a moist site. What condition should be monitored? Temperature/dewpoint convergence, moisture and cooling may support fog; stability and visibility require actual local assessment rather than a single-code guarantee. The supported result is Fog or reduced visibility development.
A change that matters
A crew assumes the sea-level maximum payload is guaranteed at a hot elevated site. What should be checked? Higher temperature and altitude generally reduce air density, which can reduce aircraft performance; numerical capability must come from the aircraft's applicable data. Here choose Applicable performance limits for the actual conditions. A supplied aircraft manual limits operation to gusts no greater than 20 knots. Forecast site gusts are24 knots. Which comparison follows? The remote PIC must consider local conditions and aircraft capability; supplied manufacturer limits are operational planning inputs, not universal FAA wind limits. Here choose The gust forecast exceeds the supplied limit by4 knots. An airport observation is acceptable but a storm cell is moving toward the actual flight area. Which information must be integrated? Thunderstorms can bring gust fronts, turbulence, lightning and rapidly changing conditions; a single favorable observation does not establish a safe route. Here choose Current local trend and approaching storm hazards. A pilot reads a valid forecast but sees unexpected local fog at the launch point. Which observation matters to the immediate decision? Temperature/dewpoint convergence, moisture and cooling may support fog; stability and visibility require actual local assessment rather than a single-code guarantee. Here choose The actual visibility and changing local conditions.
Transfer check and reasoning
A favorable airport observation is old and local fog is developing at the launch point. Which data controls the immediate go/no-go reassessment? Current local conditions and relevant updated weather. The earlier favorable report is not a guarantee for this site and time.
A mission moves from a cool low-elevation field to a hot high-elevation site. What performance concern increases?
- The relevant case condition is: A mission moves from a cool low-elevation field to a hot high-elevation site.
- Higher temperature and altitude generally reduce air density, which can reduce aircraft performance; numerical capability must come from the aircraft's applicable data.
- Therefore choose “Reduced air density can reduce available performance”. The alternatives must be tested against that same stated condition; an unrelated document, unit or approval cannot supply a missing requirement.
Compare the other answer choices
The proposed choice “Air density always increases with both changes” does not follow from the given conditions. Higher temperature and altitude generally reduce air density, which can reduce aircraft performance; numerical capability must come from the aircraft's applicable data.
The proposed choice “Payload capability must increase automatically” does not follow from the given conditions. Higher temperature and altitude generally reduce air density, which can reduce aircraft performance; numerical capability must come from the aircraft's applicable data.
The proposed choice “Temperature cannot affect a small UAS” does not follow from the given conditions. Higher temperature and altitude generally reduce air density, which can reduce aircraft performance; numerical capability must come from the aircraft's applicable data.
Try it, then explain it.
Complete a short set without looking at the example. After each answer, explain which evidence or rule supports your decision and why the alternatives do not fit.
Sources & authorship
Original Slope explanations and examples. References support the concepts; they are not the source of copied questions. Independent educator review is pending.
Faa Ac107 2AFaa Study