ATPL Instruments and Navigation Aids Exam
Questions And Answers Latest 2025
What is the Mach number formula? -
correct answer ✅Mach number = TAS/LSS
How do you calculate the LSS? -
correct answer ✅38.94 x square root of temperature in degrees
kelvin
What is 0degrees Celsius in Kelvin? -
correct answer ✅273 degrees kelvin
Is the speed of sound faster at higher altitudes or lower -
correct answer ✅Lower
Is the speed of sound faster at higher temperatures or lower? -
correct answer ✅Higher
If altitude is increased at constant TAS does Mach number do? -
correct answer ✅Increase
What is VMO? -
correct answer ✅Maximum operating IAS
,ATPL Instruments and Navigation Aids Exam
Questions And Answers Latest 2025
What is MMO? -
correct answer ✅The maximum operating speed in Mach.
What errors does the Mach meter suffer from? -
correct answer ✅Instrument, pressure, blockages
If the pitot tube becomes blocked during a climb the Mach meter
will... -
correct answer ✅Overead
If the static port becomes blocked during a climb the Mach meter
will... -
correct answer ✅Under read
What is the temperature deviation from ISA if an aircraft is at FL340
and has a TAS of 498kts and a Mach number 0.815? -
correct answer ✅+25.56•c
What is Mach number if TAS is 498kts and LSS is 595 knots? -
correct answer ✅0.837
, ATPL Instruments and Navigation Aids Exam
Questions And Answers Latest 2025
What is the altitude if a TAS of 395 corresponds to Mach 0.67? -
correct answer ✅FL297
What is the altitude if a TAS of 460knots = 0.73 Mach? -
correct answer ✅13,200ft
What inputs does the ADC get? -
correct answer ✅Pitot, static, total temperature and angle of
attack
What outputs does an ADC provide? -
correct answer ✅Altitude, V/S, IAS, Mach Number, VMO and
MMO, AOA, TAT, SAT
What is TAT? -
correct answer ✅SAT + the maximum Ram rise
What is SAT? -
correct answer ✅TAT corrected for maximum possible Ram rise
Questions And Answers Latest 2025
What is the Mach number formula? -
correct answer ✅Mach number = TAS/LSS
How do you calculate the LSS? -
correct answer ✅38.94 x square root of temperature in degrees
kelvin
What is 0degrees Celsius in Kelvin? -
correct answer ✅273 degrees kelvin
Is the speed of sound faster at higher altitudes or lower -
correct answer ✅Lower
Is the speed of sound faster at higher temperatures or lower? -
correct answer ✅Higher
If altitude is increased at constant TAS does Mach number do? -
correct answer ✅Increase
What is VMO? -
correct answer ✅Maximum operating IAS
,ATPL Instruments and Navigation Aids Exam
Questions And Answers Latest 2025
What is MMO? -
correct answer ✅The maximum operating speed in Mach.
What errors does the Mach meter suffer from? -
correct answer ✅Instrument, pressure, blockages
If the pitot tube becomes blocked during a climb the Mach meter
will... -
correct answer ✅Overead
If the static port becomes blocked during a climb the Mach meter
will... -
correct answer ✅Under read
What is the temperature deviation from ISA if an aircraft is at FL340
and has a TAS of 498kts and a Mach number 0.815? -
correct answer ✅+25.56•c
What is Mach number if TAS is 498kts and LSS is 595 knots? -
correct answer ✅0.837
, ATPL Instruments and Navigation Aids Exam
Questions And Answers Latest 2025
What is the altitude if a TAS of 395 corresponds to Mach 0.67? -
correct answer ✅FL297
What is the altitude if a TAS of 460knots = 0.73 Mach? -
correct answer ✅13,200ft
What inputs does the ADC get? -
correct answer ✅Pitot, static, total temperature and angle of
attack
What outputs does an ADC provide? -
correct answer ✅Altitude, V/S, IAS, Mach Number, VMO and
MMO, AOA, TAT, SAT
What is TAT? -
correct answer ✅SAT + the maximum Ram rise
What is SAT? -
correct answer ✅TAT corrected for maximum possible Ram rise
