DHL INTERVIEW ATPL CORE QUESTIONS WITH ANSWERS
2025/2026 GRADED A+
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
what are the RFFS(rescue and fire fighting service) for A320, A321, A330? - 320 - Cat 6
A321 - Cat 7
A330 - Cat 8
what visibility would you expect from high pressure? - poor, hazy
what does yellow arrows on the pre- threshold mean? - use for stop way only
what are the four stages of a piston engine? - induction
compression
combustion
exhaust
what is the difference between a Rhumb line and great circle - a great circle is the
shortest line between two points
a rhumb line is a line between two points that cut the meridians at the same angle
when is a air mass considered unstable - when it constantly rises
is wind in true or magnetic - True
are the stages of a CB - Developing
Mature
Dissipating
from how long on the runway are the yellow edge lights? - 600m or one third of the
runway
what colour are taxi lights - green centre lights, blue edge lights
, what are the Aircraft approach Categories - A - VAT = 91< Circling 100
B - VAT = 91-120 Circling 135
C - VAT = 121 - 140 Circling 180
D - VAT = 141 - 165 Circling 205
what is VAT? - VREF speed worked out as 1.3 VS0
what is VS0? - Stall Speed in landing config
what is V2? - the speed an aircraft came safely climb way on one engine
what is VA - the speed that is it safe to make full manoeuvring inputs
how do you work out the VAT speed? - VSO x 1.23
what is VLE? - Max speed for landing gear extended
what is VLO? - max speed for operating the landing gear
what is VMC and VMCA, VMCG, VMCL? - minimum control speed, in the air, on the
ground, in landing config - with the critical engine out
what is VNO - max operational speed
what is Vx - best angle of climb
to avoid obstacles
what is Vy - best rate of climb
to get attitude quickly
what are the four main types of fog - radiation - air is cooled by the heat escaping due to
no cloud, so air temp in lowered to due point.
Advection - warm air moves over clod ground
hill - warm air is cooled by being pushed up over a mountain
frontal - cause when a warm front is pushed over the cold air in front of it
how much runway do you have left when you see alternating whit and red centre lights -
900m
how much runway do you have left when you see red centre lights - 300m
what is MEA? - Minimum Enroute Altitude
Guarantees 1000ft clearance (2000 mountainous)
and radio signal reception along the route
2025/2026 GRADED A+
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
what are the RFFS(rescue and fire fighting service) for A320, A321, A330? - 320 - Cat 6
A321 - Cat 7
A330 - Cat 8
what visibility would you expect from high pressure? - poor, hazy
what does yellow arrows on the pre- threshold mean? - use for stop way only
what are the four stages of a piston engine? - induction
compression
combustion
exhaust
what is the difference between a Rhumb line and great circle - a great circle is the
shortest line between two points
a rhumb line is a line between two points that cut the meridians at the same angle
when is a air mass considered unstable - when it constantly rises
is wind in true or magnetic - True
are the stages of a CB - Developing
Mature
Dissipating
from how long on the runway are the yellow edge lights? - 600m or one third of the
runway
what colour are taxi lights - green centre lights, blue edge lights
, what are the Aircraft approach Categories - A - VAT = 91< Circling 100
B - VAT = 91-120 Circling 135
C - VAT = 121 - 140 Circling 180
D - VAT = 141 - 165 Circling 205
what is VAT? - VREF speed worked out as 1.3 VS0
what is VS0? - Stall Speed in landing config
what is V2? - the speed an aircraft came safely climb way on one engine
what is VA - the speed that is it safe to make full manoeuvring inputs
how do you work out the VAT speed? - VSO x 1.23
what is VLE? - Max speed for landing gear extended
what is VLO? - max speed for operating the landing gear
what is VMC and VMCA, VMCG, VMCL? - minimum control speed, in the air, on the
ground, in landing config - with the critical engine out
what is VNO - max operational speed
what is Vx - best angle of climb
to avoid obstacles
what is Vy - best rate of climb
to get attitude quickly
what are the four main types of fog - radiation - air is cooled by the heat escaping due to
no cloud, so air temp in lowered to due point.
Advection - warm air moves over clod ground
hill - warm air is cooled by being pushed up over a mountain
frontal - cause when a warm front is pushed over the cold air in front of it
how much runway do you have left when you see alternating whit and red centre lights -
900m
how much runway do you have left when you see red centre lights - 300m
what is MEA? - Minimum Enroute Altitude
Guarantees 1000ft clearance (2000 mountainous)
and radio signal reception along the route
