Ridge Crossing with a Gusty TAF and a Job Interview
A private pilot plans a 90-nm VFR cross-country in a gyroplane from a field at 1,200 ft MSL to an airport east of a 3,500-ft ridge. The destination TAF reads: wind 25012G22KT, visibility 6 SM, ceiling 4,500 ft broken, temporarily 3 SM in light rain showers, with a 30 percent probability of thunderstorms and rain between the planned arrival time and two hours after. The pilot has 30 gal of fuel, burns 8 gal/hr, and plans 1.2 hr en route. The gyroplane has no onboard weather radar, but the pilot has ADS-B weather on a tablet. The route crosses a saddle at 4,200 ft MSL, and the pilot's personal minimum is 1,000 ft above terrain and 5 SM visibility. The passenger is anxious but the pilot has a job interview at the destination.
1. Decode the TAF and identify the operational hazards for this route.
Read the worked answer
Wind 250° at 12 kt gusting 22 kt-a 10-kt spread means mechanical turbulence, especially over the ridge. Visibility 6 SM, ceiling 4,500 ft broken; temporarily 3 SM in light rain showers; 30% probability of thunderstorms and rain from arrival to two hours after. The 4,500-ft broken ceiling is only 300 ft above the 4,200-ft saddle, far below the pilot's 1,000-ft terrain margin. The temporary 3-SM showers and PROB30 TSRA add reduced visibility, strong up- and downdrafts, and hail risk. ADS-B weather is delayed and may not depict embedded cells. Basic VFR might be legal in Class E, but legality is not the issue-the route has no safe terrain clearance and convective potential.
2. Is fuel the limiting factor? Show the calculation and compare with the personal minimums.
Read the worked answer
Fuel is not limiting. Planned fuel = 1.2 hr × 8 gph = 9.6 gal. Day VFR reserve is 30 min = 4 gal. Total needed = 13.6 gal; 30 gal available, leaving 16.4 gal. The limiting factors are ceiling, visibility, turbulence, and thunderstorms.
The planned crossing would put the aircraft about 300 ft below a 4,500-ft broken layer over a 4,200-ft saddle-only 300 ft of clearance versus the pilot's 1,000-ft minimum. The PROB30 TSRA and gusty showers make the ridge crossing unsafe in a light gyroplane. Personal minimums are not optional just because the flight is technically legal.
3. What decision should the pilot make, and how should passenger pressure be handled?
Read the worked answer
Delay or cancel, or reroute only if a confirmed VFR corridor provides at least 1,000 ft above terrain and 5 SM visibility, with recent PIREPs and observations showing no convective build-up. A 30% thunderstorm probability with no onboard radar is not a route to gamble on. If already airborne, divert to an airport with better conditions and land before the cells arrive.
The job interview is external pressure-get-there-itis. Use a formal risk checklist (PAVE) and brief go/no-go criteria before departure. Driving or taking a later flight is the lower-risk choice. The passenger's anxiety does not change the weather; the pilot's job is to protect the passenger, not meet the schedule.