Reading the Limits Before the Checkride
A sport pilot applicant is preparing for his practical test. His training airplane is an LSA with a maximum takeoff weight of 1,320 lb, a published never-exceed speed (Vne) of 138 knots, a maximum level-flight speed at full power of 118 knots, and a stall speed in the landing configuration (Vso) of 42 knots. The applicant's instructor has signed him off for the practical test. On the morning of the test, the applicant reviews the aircraft's documents and notices the airspeed indicator markings: a white arc from 40 to 100 knots, a green arc from 45 to 125 knots, and a red line at 138 knots. He also notes that the airplane's operating limitations are in the aircraft and the weight and balance has been computed for the planned flight with two occupants and full fuel, coming in 30 lb under maximum gross weight. Density altitude at the airport is forecast to be 6,500 ft.
1. Evaluate the airplane's speeds against the light-sport aircraft definition. Does anything here suggest the aircraft does not qualify, or that the markings are inconsistent?
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Check the LSA limits for a landplane:
- Max takeoff weight: 1,320 lb - the aircraft is at 1,320 lb, so it qualifies.
- Max level-flight speed at full power: 118 knots - must not exceed 120 knots, so it qualifies.
- Vne: 138 knots - the LSA definition does not cap Vne at 120; the 120-knot figure applies to maximum level-flight speed, not never-exceed speed. So 138 knots Vne is not by itself disqualifying.
- Vso: 42 knots - the LSA limit for stall speed in the landing configuration is 45 knots, so it qualifies.
Markings check:
- White arc (flap operating range) should run from Vso (42) to Vfe. The white arc starts at 40, slightly below the published Vso of 42 - a discrepancy worth flagging.
- Green arc should run from Vs1 to Vne. It starts at 45 and ends at 125, but Vne is 138, so the green arc should extend to 138, not 125.
- Red line at 138 matches Vne.
The applicant should raise the marking discrepancies with the instructor and verify against the aircraft's approved markings or POH before flight. Inconsistent markings are a legitimate preflight concern and a possible maintenance issue.
2. The density altitude is 6,500 ft and the airplane is 30 lb under max gross. How should the applicant think about performance for the practical test flight, and what should he verify before accepting the flight?
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High density altitude degrades both takeoff/climb and landing performance. Even 30 lb under max gross does not rescue a high-DA day; the combination of near-max weight and 6,500 ft DA is the worst case for a light LSA.
Before accepting the flight he should:
- Compute takeoff and landing distances from the POH for the actual pressure altitude, temperature, and weight - including the 50-ft obstacle distances - and compare against the available runway with a healthy margin.
- Check climb performance - a lightly powered LSA at high DA may climb slowly; ensure terrain/obstacle clearance and a plan if climb is inadequate.
- Consider reducing weight (less fuel) if performance is marginal, while preserving required reserves.
- Brief a rejected-takeoff and engine-failure plan appropriate to the conditions.
If the numbers don't work with margin, the correct decision is to postpone or relocate the flight - a practical test is not a reason to accept marginal performance. The examiner will expect the applicant to have done this homework and to be willing to say no.
3. The applicant is nervous and asks whether he can 'just do the oral today and fly tomorrow when it's cooler.' How does the practical test process handle that, and what should he know about the aircraft documents he must present?
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The practical test is a single event: the oral and flight portions are conducted together by the same examiner, and satisfactory completion of the oral is a prerequisite to the flight portion. Deferring the flight to another day generally means the test is not completed and would need to be rescheduled; it is not a menu where the oral 'banks' for tomorrow. The applicant should confirm the examiner's expectations, but the practical answer is that the test is conducted as a whole.
Documents he should have ready for the aircraft:
- Airworthiness certificate.
- Registration.
- Operating limitations (including any that restrict sport pilot operation or day/night VFR).
- Weight and balance data.
- Maintenance/inspection records showing current status.
He should also have his own documents: identification, his logbook with the instructor's endorsement for the practical test, and evidence of the required training and knowledge test. If performance is marginal today, the mature move is to reschedule the whole test for better conditions rather than fly a marginal airplane to avoid inconvenience.