A commercial air transport flight is to be conducted in a single-engined piston aircraft. At the most

critical point during the flight, the distance to be travelled to a safe landing place is 10 NM. Given the

following information, what is the lowest altitude the aircraft should fly over this critical point?

Terrain elevation: 0 ft

Gross glide gradient: 10%

TAS: 110 kt

Expected tailwind component: 20 kt

1 NM = 6080 ft

Still air distance = (height difference / net gradient) × 100

Ground distance = Still Air Distance × (GS / TAS)