4 ms·
Thin and very cold air. The altitude was 33000 feet (FL330). Assuming a ground temperature of 15 celsius and a drop in temperature of 2 degrees per 1000 feet
by DonaldFisk 10y ago
Thin and very cold air.
The altitude was 33000 feet (FL330). Assuming a ground temperature of 15 celsius and a drop in temperature of 2 degrees per 1000 feet gives an OAT of -51 celsius. My flight computer converts 358KIAS @ 33000feet @ -51celsius to 620KTAS, which is Mach 0.94.
FL = flight level (hundreds of feet)
KIAS = knots indicated air speed
KTAS = knots true air speed
OAT = outside air temperature