Premium on Safety - Issue 47, 2022 - 14

QUIZ ANSWERS
SAFETY QUIZ ANSWERS
1 (B) Simply put, a Mach number is a ratio-the
speed of the aircraft over the speed of sound. The
Mach number signifies how many times the speed
of sound you are flying. The speed of sound is 340
meters per second (1,126 ft/s). If a plane is flying at
that speed, it is flying Mach 1. If it is flying twice as
fast, Mach 2, and half that speed, Mach 0.5. Plenty
of sleek, swept-wing business jets can approach
Mach 0.9.
2 (D) Local Mach numbers vary depending on
atmospheric conditions, air temperature,
and density.
3 (C) Swept wing technology delays the supersonic
flow of air over the wing, allowing the aircraft to
fly at a higher Mach number before it encounters
debilitating wave drag.
4 (A) In Class C or D airspace (at or below 2,500 feet
agl within 4 nm of the primary airport), the FARs
dictate that 200 knots indicated airspeed is the
A higher critical Mach number
can be achieved using wing
sweep, as demonstrated in this
minisode produced by the folks
at Boldmethod.
QUIZ ON PAGE 7
maximum unless a pilot receives ATC approval
to operate at a higher speed. FAR 91.117(d)
states that if the minimum safe airspeed for any
particular operation is greater than the maximum
speed prescribed in this section, the aircraft
may operate at that minimum speed. There is no
requirement to advise ATC when exceeding a
speed for this reason.
14

Premium on Safety - Issue 47, 2022

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