New Zealand ATPL Advanced Aerodynamics, Performance, and Systems Knowledge (Aeroplane) 2024/2025 Exam Questions and Answers | 100% Solved

New Zealand ATPL Advanced
Aerodynamics, Performance, and
Systems Knowledge (Aeroplane)
2024/2025 Exam Questions and Answers
| 100% Solved



Explain the term 'speed of sound' - 🧠ANSWER ✔✔the speed at which

sound travels through air at a given temperature

Calculate the speed of sound given the appropriate information -

🧠ANSWER ✔✔LSS(kts)=38.94X sqrt(temperature (K))


Explain the factors determining the local speed of sound (LSS) -

🧠ANSWER ✔✔Mach number is the ratio of TAS to LSS


Calculate 'Mach number' given the appropriate information - 🧠ANSWER

✔✔MaCH# = TAS/LSS


Explain the change of IAS and TAS as a function of altitude at a given

Mach


number. - 🧠ANSWER ✔✔


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,Explain the term critical Mach number (Mcrit) - 🧠ANSWER ✔✔


Explain the potential hazard of maintaining a constant Mach number in

descent - 🧠ANSWER ✔✔


Explain the term 'crossover altitude'. - 🧠ANSWER ✔✔


Explain swept wing pitching moments at subsonic and transonic speeds -

🧠ANSWER ✔✔


Explain the 'lateral stability' issues arising at high subsonic speeds. -

🧠ANSWER ✔✔


Explain how the following factors affect lateral stability at high subsonic

speeds:

(a) dihedral

(b) anhedral

(c) tail surface shielding

(d) wing position

(e) keel surface/fin area


(f) sweepback. - 🧠ANSWER ✔✔



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,Explain the requirement to match lateral and directional stability -

🧠ANSWER ✔✔


Explain the conditions of:

(a) spiral instability

(b) Dutch roll


(c) snaking. - 🧠ANSWER ✔✔


Describe the function of a yaw damper system - 🧠ANSWER ✔✔


Describe how 'active flight path stability' is managed by a fly-by-wire control


system. - 🧠ANSWER ✔✔


Explain the meaning of the term 'shockwave'. - 🧠ANSWER ✔✔


Explain the formation of shockwaves. - 🧠ANSWER ✔✔


Describe the changes to the air as it passes over an aerofoil when the free

airflow


stream is between Mcrit and Mach 1.0. - 🧠ANSWER ✔✔


Describe the movement of the centre of pressure with increasing Mach

number - 🧠ANSWER ✔✔


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, Describe the changes to the air as it passes through a shockwave. -

🧠ANSWER ✔✔


Within the transonic range, describe the change in the:

(a) lift coefficient


(b) drag coefficient - 🧠ANSWER ✔✔


Describe the behaviour of the shockwaves as the Mach number increases -

🧠ANSWER ✔✔


Explain the meaning of the term 'bow wave' - 🧠ANSWER ✔✔


With respect to the streamline pattern, describe:

(a) compression waves


(b) expansion waves. - 🧠ANSWER ✔✔


Describe the velocity behind:

(a) a normal shockwave


(b) an oblique shockwave. - 🧠ANSWER ✔✔


Explain the meaning of the term 'sonic buffet/Mach buffet'. - 🧠ANSWER

✔✔



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