ATPL Navaids P1

The mach number increases during a climb at constant IAS/CAS because of increasing _____ error and because the LSS is ______

• altitude; decreasing
• speed; constant
• density; increasing
• density; decreasing

Mach number increases during a climb at constant TAS because the LSS is ______ because of ______ temperature

• increasing, increasing

• decreasing, decreasing

• decreasing, increasing

• increasing, decreasing

As an aircraft climbs at a constant Mach number in ISA conditions the IAS/CAS decreases, because of what? and the TAS decreases because of what?

• IAS/CAS remains constant due to stable air pressure; TAS remains constant due to unchanged speed.
• IAS/CAS decreases due to increased temperature; TAS decreases due to reduced engine power.
• IAS/CAS decreases due to increasing density error; TAS decreases due to decreasing speed of sound.

• IAS/CAS increases due to higher air density; TAS increases due to higher true speed at lower altitude.

Mach number equals?

• Mach number is the speed of light divided by the object's speed.
• Mach number is the square of the object's speed.
• Mach number equals the ratio of the TAS to LSS

• Mach number is the difference between the object's speed and the speed of sound.

The only factor which effects the speed of sound through the air is _________ of the air

As the air _________ increases, the speed of sound also increases.

• altitude
• pressure
• temperature
• humidity

In the event of a static source blockage, is transition to the secondary/backup system normally automatic or manual?

• Automatic

• Manual

• Depends on the type of system

• Depends on the selection on the FMS CDU

Which of the following are errors that a machmeter may suffer from?

• Density error, temperature error and manoeuvre induced errors.

• Compressibility error, pressure error and lag.

• Instrument error, temperature error and lag.

• Instrument error, position error and manoeuvre induced errors.

What is the cause of manoeuvre induced errors?

• Unpredictable changes in airflow over the static pressure source.

• Unpredictable changes in airflow over the angle of attack vane.

• Interruption of the electrical signal from loose fittings.

• Unpredictable changes in the airflow over the temperature probe.

Why does the machmeter have instrument errors?

• Manufacturing errors

• Due to temperature variation from ISA

• Due to software errors in the algorithms

• Due to the positioning of the probes

In a climb, if the source of pitot pressure to the machmeter is blocked, the:

• Altitude aneroid capsule will contract and the machmeter will overread

• Altitude aneroid capsule will contract and the machmeter will underread

• Altitude aneroid capsule will expand and the machmeter will overread

• Altitude aneroid capsule will expand and the machmeter will underread