ATPL from Pilot Assessments

Question 1

Line of Sight formula

ATPL Radio Navigation

Answer 1

1.23 * (square root of height of transmitter + square root of height of aircraft) = range of the station in nautical miles

Question 2

VDF

QTE
QUJ

ATPL Radio Navigation
Oxford Radio Navigation pg 77

Answer 2

VHF Direction Finder
Class A: accurate to within + 2°
Class B: accurate to within + 5°
Class C: accurate to within + 10°
Class D: accurate to > 10°

QTE true bearing from the station
QUJ true track from the aircraft to the station

Question 3

Take-off Speed of a kangaroo that jumps 2.8m

ATPL Physics
Torricelli’s equation

Answer 3

This is used to find the velocity of an object without a known time interval.
Vf squared = Vi squared + 2as

a = gravity 9.8m/s^2 (insert as a negative)
s = 2.8m
Vf = 0
Find Vi

Question 4

Ohm’s Law

ATPL Physics

Answer 4

Virgins Are Rare

V = I x R

Question 5

Lever arm

ATPL Physics

Answer 5

Perpendicular distance between the line of action of a force and a pivot.

(Sine x angle of the line of action) x distance to the pivot along the arm

Lever principle, force x lever arm equals force x lever arm

Question 6

Continuous fire detector or Firewire principal modes of operation

ATPL AGK
Oxford AGK 1 pg 357

Answer 6

Negative resistance coefficient
-as temperature increases resistance decreases allowing current to flow between the electrode within the steel tube and the tube’s outer layer. As the current increases with decrease in resistance it will eventually trigger a fire alarm.

Positive capacitance coefficient
-as temperature increases capacitance increases. A half wave rectified AC control unit will discharge the element as feedback while temperature increases. At a certain temperature the feedback will be sufficient to trigger a fire alarm and unlike the resistance type, cannot result in a false alarm in case of a short circuit.