DHL INTERVIEW ATPL ALL EVALUATION QUESTIONS WITH
ANSWERS 2025/2026 GRADED A+
what is interference drag? - Drag caused by interaction of boundary layers at major
aircraft components
what are high aspect ratio wings - long thin wings
what are low aspect ratio wings - short fat ones
why are all jet liners wings swept - they are better at close to mach
where does the Pulmonary artery pump blood to? - the lungs
what is reduced when someone hyper ventilates - CO2
how long such you void flying for after giving blood? - 24 hrs
what percentages of accidents are caused by human error - 70%
What is the tropopause? - The boundary between the troposphere and the stratosphere.
Where temp no longer increases with height
what does the air need to be at the summit of a mountain to cause mountain waves? -
stable
what does they wind need to be doing with increasing altitude to cause mountain
waves? - increasing
why won't cirrus clouds cause icing - they are already ice crystals
what side of the polar jet stream in the most turbulence on? - the cold side
what is Grivation - the combination of Grid convergence and magnetic variation
what is ISA? - Temp 15
Pressure 1013.35
Density 1225
- 2 c per 1000ft
27ft per 1 Hpa
What is pressure Altitude? - the vertical distance from ISO
how many nautical miles is one degree of latitude? - 60NM
where is the magnetic pole? - North Canada
,what cool would the magnetic pole be? - blue
what is the formula for rate of descent and ground speed for a 3 degree glide slope - 5 x
Ground speed = Rate of Descent
what air is used to cool the air in the boot leg air conditioning system? - Ramp air
what are the advantages of cruising at high altitudes - faster
more efficient
above bad weather
what does the pack flow control valve - controls the flow of bleed air in to the Air con
packs
how many heat exchangers are there is bootstrap system - 2
primary
main(secondary)
For the localiser, what frequency is on the left and right lobes - left - 90 hz - Yellow
right - 150 hz - Blue
for the glides slope, what is the frequency of the lobes above and below? - above - 90hz
- yellow
below - 150hz - blue
what are the colours for the outer, middle and inner marker for the ILS - outer - blue
middle - yellow
inner - white
how is an ILS with a DME indicated on a approach chart - it will have a D before the ILS
frequency
what are the ranges you should be able to pick up the localiser - 25 nm - 10 degrees
either side
17 Nm - 35 degrees either side
10NM - 90 either side
at what range does the glide slope have its best accuracy? - 10nm - 8 degrees either
side
how does a DME work - the aircraft sends out a pulse and the ground station sends it
back. depending on the time to recieve it back depends on the distance - Slant range
What does VOR mean? - VHF Omnidirectional Range
,what range are VOR usable to? - 25 - 140 nm
what is the range of frequency for a VOR - 108- 117.9 Mhz
are VOR aligned to True North or Magnetic North? - Magnetic
how does a VOR work - it emits two signals
one rotating at a certain speed and one turning on and off
what is the difference between N0NA1A and N0NA2A for an NDA - N0NA1A - requires
an BFO(beat frequency oscillation) for manual tuning, identifying and monitoring
N0NA2A - doesn't require a BFO
what errors are NDB/ADF erected by - Static Interference
Night effect
Station Interference
Costal Refraction
Multi Path Propagation
Quadrantal Effect
how do NDB Waves propagate? - Surface waves
why are skywaves caused at night - because at night the lower levels of the ionosphere
disappears
the ionosphere absorbs the radio waves in the day so it doesn't bounce back down to
earth
What effect causes a ADF needle to hunt? - Night effect
what is a QDM? - magnetic bearing TO the station
what is a QDR? - Magnetic bearing FROM the station
what is a QUJ? - True bearing TO a station
what is a QTE? - True track FROM a station.
what is the memory add for variation - Variation west, magnetic best
True + Variation = magnetic heading
Variation east magnetic least
True - variation = magnetic heading
what frequency range does a MLS system work in? - 5031 - 5090 Mhz
what is the SSR code for unlawful interference? - 7500
, what is the SSR code for radio failure - 7600
what is the SSR code for Emergency - 7700
What does SSR stand for? - Secondary Surveillance Radar
what range and angle is a MLS accurate for? - 20NM - 40 degrees either side
what is the difference between primary and secondary radar? - Primary sends out a
pulse frequency and receives the same frequency back
Secondary send out a pulse frequency but receives back a different frequency.
what is a CW radar? - an continues wave radar
what is a radar PRF? - Pulse repetition Frequency
the amount of pulses per minute
what the determines the max range of a radar - the PRF
the lower the PRF the further the range, as the radar as the pulse will take longer to
return
what is the frequency for a AWR(airborne weather radar) - 9375GHz - its optimised for
the size of water droplets or hail
what are the limits of CAT 1,2,3A,3B,3C for ILS - Cat 1 - DH 200ft or above
- RVR - 550 m or above
Cat 2 - DH - 200ft - 100ft
- RVR - 300m or above
Cat 3A - DH - 0 - 100 ft
- RVR - 200 m or above
Cat 3B - DH 0 - 50 ft
- RVR - 75 - 200m
Cat 3C - No limitations
with a SSR - what is the interrogation frequency? and what is the reply frequency? -
interrogation - 1030
Reply - 1090
what is the benefit of a slot antenna over a parabolic reflector? - it requires less power
what is water vapour directly to Ice called? - deposition or resublimation
what does 1 minute of a meridian equal? - 1 NM
what is the change in ice directly to water vapour - sublimation
ANSWERS 2025/2026 GRADED A+
what is interference drag? - Drag caused by interaction of boundary layers at major
aircraft components
what are high aspect ratio wings - long thin wings
what are low aspect ratio wings - short fat ones
why are all jet liners wings swept - they are better at close to mach
where does the Pulmonary artery pump blood to? - the lungs
what is reduced when someone hyper ventilates - CO2
how long such you void flying for after giving blood? - 24 hrs
what percentages of accidents are caused by human error - 70%
What is the tropopause? - The boundary between the troposphere and the stratosphere.
Where temp no longer increases with height
what does the air need to be at the summit of a mountain to cause mountain waves? -
stable
what does they wind need to be doing with increasing altitude to cause mountain
waves? - increasing
why won't cirrus clouds cause icing - they are already ice crystals
what side of the polar jet stream in the most turbulence on? - the cold side
what is Grivation - the combination of Grid convergence and magnetic variation
what is ISA? - Temp 15
Pressure 1013.35
Density 1225
- 2 c per 1000ft
27ft per 1 Hpa
What is pressure Altitude? - the vertical distance from ISO
how many nautical miles is one degree of latitude? - 60NM
where is the magnetic pole? - North Canada
,what cool would the magnetic pole be? - blue
what is the formula for rate of descent and ground speed for a 3 degree glide slope - 5 x
Ground speed = Rate of Descent
what air is used to cool the air in the boot leg air conditioning system? - Ramp air
what are the advantages of cruising at high altitudes - faster
more efficient
above bad weather
what does the pack flow control valve - controls the flow of bleed air in to the Air con
packs
how many heat exchangers are there is bootstrap system - 2
primary
main(secondary)
For the localiser, what frequency is on the left and right lobes - left - 90 hz - Yellow
right - 150 hz - Blue
for the glides slope, what is the frequency of the lobes above and below? - above - 90hz
- yellow
below - 150hz - blue
what are the colours for the outer, middle and inner marker for the ILS - outer - blue
middle - yellow
inner - white
how is an ILS with a DME indicated on a approach chart - it will have a D before the ILS
frequency
what are the ranges you should be able to pick up the localiser - 25 nm - 10 degrees
either side
17 Nm - 35 degrees either side
10NM - 90 either side
at what range does the glide slope have its best accuracy? - 10nm - 8 degrees either
side
how does a DME work - the aircraft sends out a pulse and the ground station sends it
back. depending on the time to recieve it back depends on the distance - Slant range
What does VOR mean? - VHF Omnidirectional Range
,what range are VOR usable to? - 25 - 140 nm
what is the range of frequency for a VOR - 108- 117.9 Mhz
are VOR aligned to True North or Magnetic North? - Magnetic
how does a VOR work - it emits two signals
one rotating at a certain speed and one turning on and off
what is the difference between N0NA1A and N0NA2A for an NDA - N0NA1A - requires
an BFO(beat frequency oscillation) for manual tuning, identifying and monitoring
N0NA2A - doesn't require a BFO
what errors are NDB/ADF erected by - Static Interference
Night effect
Station Interference
Costal Refraction
Multi Path Propagation
Quadrantal Effect
how do NDB Waves propagate? - Surface waves
why are skywaves caused at night - because at night the lower levels of the ionosphere
disappears
the ionosphere absorbs the radio waves in the day so it doesn't bounce back down to
earth
What effect causes a ADF needle to hunt? - Night effect
what is a QDM? - magnetic bearing TO the station
what is a QDR? - Magnetic bearing FROM the station
what is a QUJ? - True bearing TO a station
what is a QTE? - True track FROM a station.
what is the memory add for variation - Variation west, magnetic best
True + Variation = magnetic heading
Variation east magnetic least
True - variation = magnetic heading
what frequency range does a MLS system work in? - 5031 - 5090 Mhz
what is the SSR code for unlawful interference? - 7500
, what is the SSR code for radio failure - 7600
what is the SSR code for Emergency - 7700
What does SSR stand for? - Secondary Surveillance Radar
what range and angle is a MLS accurate for? - 20NM - 40 degrees either side
what is the difference between primary and secondary radar? - Primary sends out a
pulse frequency and receives the same frequency back
Secondary send out a pulse frequency but receives back a different frequency.
what is a CW radar? - an continues wave radar
what is a radar PRF? - Pulse repetition Frequency
the amount of pulses per minute
what the determines the max range of a radar - the PRF
the lower the PRF the further the range, as the radar as the pulse will take longer to
return
what is the frequency for a AWR(airborne weather radar) - 9375GHz - its optimised for
the size of water droplets or hail
what are the limits of CAT 1,2,3A,3B,3C for ILS - Cat 1 - DH 200ft or above
- RVR - 550 m or above
Cat 2 - DH - 200ft - 100ft
- RVR - 300m or above
Cat 3A - DH - 0 - 100 ft
- RVR - 200 m or above
Cat 3B - DH 0 - 50 ft
- RVR - 75 - 200m
Cat 3C - No limitations
with a SSR - what is the interrogation frequency? and what is the reply frequency? -
interrogation - 1030
Reply - 1090
what is the benefit of a slot antenna over a parabolic reflector? - it requires less power
what is water vapour directly to Ice called? - deposition or resublimation
what does 1 minute of a meridian equal? - 1 NM
what is the change in ice directly to water vapour - sublimation
