QFE from QNH & Airfield Elevation

QFE is the local pressure at airfield level — altimeter reads zero on the ground. Calculated using the ISA barometric formula (1 hPa ≈ 27 ft near sea level). Set sub-scale to QFE for circuit work; height shown is height above the airfield.

Mass & Balance

Defaults follow Cessna 152 POH. Select an aircraft profile above to override empty mass, arms and MTOW. Always cross-check against the per-airframe W&B schedule.

Reference only. Always cross-check with the current per-airframe W&B schedule. Combined baggage A+B must not exceed 120 lb. Normal category envelope used.

C152 Takeoff & Landing Distance

UK CAA "Safety Factor" method applied to published C152 reference distances. Flight-planning tool only — always add the legally required safety factor.

Factors: +10% per 1,000 ft PA, +1%/°C above ISA, -2.5% per kt headwind (capped), +5%/kt tailwind, +20% short or +30% long-wet grass, +15% wet paved, +5% per 1% up-slope. Mass (W/W_max)².

Fuel Planning & Endurance

Aircraft burn-rate defaults are cruise values at typical GA power settings. Override GPH from your POH for accuracy.

Reserves required by CAA/EASA: 30 min VFR day, 45 min VFR night or IFR, plus taxi + alternate + 5–10% contingency. Plan legal fuel, load extra if WX marginal.

Climb Performance

Sea-level ROC derated for density altitude and mass. Time, distance and fuel to reach cruise altitude.

ROC derates ~3.5%/1000 ft density altitude, ~2% per 1% over-mass. Zero at service ceiling. Always verify against the POH climb chart.

Top of Descent (TOD)

Plan when to start a descent so you arrive on profile rather than rushed or floating high. Pick how to constrain the descent — the other values are derived from the height to lose and your ground speed.

Rule of thumb: the “3:1 rule” — 3 NM per 1,000 ft to lose — matches a standard 3° (ILS-style) glide path and is comfortable at typical light-aircraft groundspeeds. A shallower 5 NM/1,000 ft (~1.9°) lets you stay at low cruise power for longer.

Sunrise, Sunset & Civil Twilight

End of Civil Twilight is the latest a UK day-rated PPL may continue VFR flight. Times are local (browser timezone).

Pre-Flight Risk Assessment (PAVE + IMSAFE)

Self-brief based on CAA Safety Sense Leaflet 26 / FAA AC 60-22. Score each PAVE category for the planned flight, then confirm IMSAFE personal fitness. The result is advisory — you are the pilot in command.

PAVE

IMSAFE — tick all that apply to you right now

History (saved on this device, last 10)

Advisory tool only. PAVE + IMSAFE are decision aids, not a clearance. If anything feels wrong, don't fly — the airfield will be there tomorrow.