Horizontal Stabilizer Indicated Airspeed Knot 
Pilot Institute
JULY 11, 2025
Why don’t they use Indicated Airspeed just like the pilots who fly slower aircraft? Key Takeaways Mach number is a dimensionless ratio of true airspeed to local speed of sound. In terms of a formula, you can write it as: Mach number (M)= True Airspeed (TAS) / Speed of Sound (a) This means Mach 1 is the speed of sound, Mach 0.5
Aerotime
MARCH 21, 2025
TSB Approach sequence Due to reported wind gusts as the CRJ900 approached Toronto Pearson following a flight from MinneapolisSaint Paul International Airport (MSP) the aircraft was flown at 149 knots. One second later (2.6seconds before touchdown), the EGPWS alert sink rate sounded, indicating a high rate of descent.
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Plane and Pilot
SEPTEMBER 20, 2024
Alongside a nearby highway, some recognizable bits of airplane, the vertical stabilizer and rudder, a horizontal stabilizer and elevator, fell separately to Earth. But a review of the avionics data shows it was entered at the correct airspeed (placarded as between 104 and 165 knots), and the roll rate was constant.
Plane and Pilot
SEPTEMBER 20, 2024
Alongside a nearby highway, some recognizable bits of airplane, the vertical stabilizer and rudder, a horizontal stabilizer and elevator, fell separately to Earth. But a review of the avionics data shows it was entered at the correct airspeed (placarded as between 104 and 165 knots), and the roll rate was constant.
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