ATPL AIRCRAFT SYSTEMS EXAM
QUESTIONS AND ANSWERS
Highest temp in gas turbine engine - Correct Answers -At the primary part of the
combustion chamber
The HOT battery BUS is powered by - Correct Answers -Only by the aircraft battery
What is not an element of anti-skid* - Correct Answers -Pneumatic reserve braking
Compared to turbojet of the same thrust output, the HP turbine of a turbo fan would be -
Correct Answers -Smaller due to reduced mass airflow
What in not an output of the air data computer - Correct Answers -Pitch attitude
The nose wheel steering follow up does ? - Correct Answers -Commands the steering
valve to select the nose wheel in neutral during gear retraction
on a conventional wing section what is the. charasteritics of the airflow ahead of a
normal shockwave - Correct Answers -supersonic ahead. of the shockwave, subsonic
behind with no change in airflow direction.
static pressure and density increase greatly
total pressure decreases greatly
throttle is set during a climb in a turbojet aircraft which element is maintained as the
aircraft climbs - Correct Answers -Fan Speed N1
Vortex generators on a horizontal stabiliser primarily do what ? - Correct Answers -to
reduce flow seperation and preserve elevator authority at all airspeed
what is the effect of dissolved water in Avtur fuel - Correct Answers -increase SG and
causes corrosion
tyres must be replaced when - Correct Answers -there is a bulge in the tread
air conditioner load on an engine can be relived by - Correct Answers -selecting the re-
circulation fans on the airconditioner controleer
,Body gear when fitted - Correct Answers -turns in the opposite direction to nose gear to
reduce scuffing
spiral instability is worst when - Correct Answers -directional stability is high compared
to lateral stability
climbing at a constant CAS you would expect mach number and TAS to - Correct
Answers -both increase
climbing at a constant speed below VMO you would expect - Correct Answers -the
MMO value to eventually be exceeded
to reduce VMCG speed you could - Correct Answers -decrease take off thrust setting
and move CoG forwars
a high density altitude affects the VMCG speed in what way - Correct Answers -
decreases it
what happens with a loss of the right engine - Correct Answers -bank to the live
less rudder deflection
skid ball slightly displaced to the live engine
in an aircraft with two engines mounted in pods beneath the wing and one tail mounted
engine with a high thrust line failure of the left wing mounted engine would see - Correct
Answers -pitch up
yaw to left
right rudder trim
what most affects VMCA - Correct Answers -high density altitude
dihederal
skid induced blanketing
all reduce VMCA values
When is induced drag greatest? - Correct Answers -induced drag is greatest at high
AoA for MAX lift
compared to a conventional wing a laminar flow wing has its position of max camber -
Correct Answers -further rearward with increase nose radius
in comparing Mcrit and Mcdr of a supercritical wing to a conventional cambered wing -
Correct Answers -Mcrit and Mcdr are both higher
what is the purpose of shark teeth - Correct Answers -fitted to LE near the wing roots to
stall first and provide more stable static longitudinal stability at the stall
,shortly after takeoff, a swept wing aircraft encounters a downdraft. best recovery
technique - Correct Answers -raise aircraft alpha to just less than stick shaker speed
What are the properties of slots and LE flaps - Correct Answers -slots and slats re-
energise the boundary layer, slats and LE flaps increase camber
relationship between leading edge devices and AoA - Correct Answers -contribute most
to lift at high AoA
the LE device fail to extend on approach but the TE do extend normally. you would
expect what changes to approach alpha angle, drag selected approach speed and
cockpit cut-off angle compared to an approach with all high lift devices - Correct
Answers -lower alpha and drag, higher approach speeds and improved view over the
nose
describe the properties of a zap flap - Correct Answers -increases camber, drag and
wing area, requires nose up trim change
what are spoiler panels - Correct Answers -located just ahead of the TE flaps. deflection
of the roll spoilers on the right wing will see the right wing aileorn delfect upwards to
initiate a roll to the right
how do shockwaves form - Correct Answers -first over the upper wing surface where
the airflow reduces to below mach 1. the lower shockwave forms later but reaches the
TE before the upper shock wave
as speed increase beyond Mcrit - Correct Answers -the Centre of lift moves aft, lift
reduces and a nose-down pitch moment occurs (machtuck)
what is the order of event as speed increase - Correct Answers -Mcrit Mcdr, speed of
sound, Mdet
what are the qualities behind a normal shockwave - Correct Answers -temp and static
pressure rise, velocity and Mach decrease and density increases
what is dependent on the airflow direction during a shockwave - Correct Answers -
oblique experiences changes in direction
normal does not
qualities of high-flying jet aircraft featuring swept wings - Correct Answers -low speed
stall IAS increases cumulatively as altitude is gained
the aerodynamic ceiling for a given aircraft is - Correct Answers -lower with increased
turbulence and bank angle
, increased apparent gross weight does what if anything to the speed margin between
initial buffet speeds - Correct Answers -reduces it
an aircraft is crusing at a very high altitude and experiences buffet. this is - Correct
Answers -high or low speed buffet
to ensure correct flow direction is maintained in hydraulic system you would fit a -
Correct Answers -CHECK VALVE
what are the qualities of the pneumatic system - Correct Answers -the pneumatic
systems is lighter than the hydraulic systems
purpose of a shuttle valve - Correct Answers -are automatic which operate should
normal system pressure fail
do jet aircraft use electrical starter mechanisms - Correct Answers -no0o
what is the ideal humidity fir aircraft cabin - Correct Answers -60%
humidity level possible flying in jet aircraft - Correct Answers -30%
ideal temperature range for humans - Correct Answers -18-24
does bleed air extraction affect take off performance - Correct Answers -true during take
off and climb performance
what is an advantage of the air-cycle machine - Correct Answers -light weight but has
poor ground cooling
where is the lowest temperature achieved in the air cycle machine - Correct Answers -at
the expansion turbine outlet
to achieve a fail operation autopilot coupled ILS approach in a B767-300ER - Correct
Answers -three autopilot engage at 1500 radio altitude
what is the primary purpose of a super critical wing section - Correct Answers -
increases the critical drag rise number
coffin corner is best described as the situation where an aircraft is operating at such
high altitude that the difference between high and low speed buffet is only a few knots
what is the relationship effected by - Correct Answers -it is effected by aircraft weight
and loaf factors
what is the purpose of a TRU - Correct Answers -it converts AC to DC and steps down
the voltage
QUESTIONS AND ANSWERS
Highest temp in gas turbine engine - Correct Answers -At the primary part of the
combustion chamber
The HOT battery BUS is powered by - Correct Answers -Only by the aircraft battery
What is not an element of anti-skid* - Correct Answers -Pneumatic reserve braking
Compared to turbojet of the same thrust output, the HP turbine of a turbo fan would be -
Correct Answers -Smaller due to reduced mass airflow
What in not an output of the air data computer - Correct Answers -Pitch attitude
The nose wheel steering follow up does ? - Correct Answers -Commands the steering
valve to select the nose wheel in neutral during gear retraction
on a conventional wing section what is the. charasteritics of the airflow ahead of a
normal shockwave - Correct Answers -supersonic ahead. of the shockwave, subsonic
behind with no change in airflow direction.
static pressure and density increase greatly
total pressure decreases greatly
throttle is set during a climb in a turbojet aircraft which element is maintained as the
aircraft climbs - Correct Answers -Fan Speed N1
Vortex generators on a horizontal stabiliser primarily do what ? - Correct Answers -to
reduce flow seperation and preserve elevator authority at all airspeed
what is the effect of dissolved water in Avtur fuel - Correct Answers -increase SG and
causes corrosion
tyres must be replaced when - Correct Answers -there is a bulge in the tread
air conditioner load on an engine can be relived by - Correct Answers -selecting the re-
circulation fans on the airconditioner controleer
,Body gear when fitted - Correct Answers -turns in the opposite direction to nose gear to
reduce scuffing
spiral instability is worst when - Correct Answers -directional stability is high compared
to lateral stability
climbing at a constant CAS you would expect mach number and TAS to - Correct
Answers -both increase
climbing at a constant speed below VMO you would expect - Correct Answers -the
MMO value to eventually be exceeded
to reduce VMCG speed you could - Correct Answers -decrease take off thrust setting
and move CoG forwars
a high density altitude affects the VMCG speed in what way - Correct Answers -
decreases it
what happens with a loss of the right engine - Correct Answers -bank to the live
less rudder deflection
skid ball slightly displaced to the live engine
in an aircraft with two engines mounted in pods beneath the wing and one tail mounted
engine with a high thrust line failure of the left wing mounted engine would see - Correct
Answers -pitch up
yaw to left
right rudder trim
what most affects VMCA - Correct Answers -high density altitude
dihederal
skid induced blanketing
all reduce VMCA values
When is induced drag greatest? - Correct Answers -induced drag is greatest at high
AoA for MAX lift
compared to a conventional wing a laminar flow wing has its position of max camber -
Correct Answers -further rearward with increase nose radius
in comparing Mcrit and Mcdr of a supercritical wing to a conventional cambered wing -
Correct Answers -Mcrit and Mcdr are both higher
what is the purpose of shark teeth - Correct Answers -fitted to LE near the wing roots to
stall first and provide more stable static longitudinal stability at the stall
,shortly after takeoff, a swept wing aircraft encounters a downdraft. best recovery
technique - Correct Answers -raise aircraft alpha to just less than stick shaker speed
What are the properties of slots and LE flaps - Correct Answers -slots and slats re-
energise the boundary layer, slats and LE flaps increase camber
relationship between leading edge devices and AoA - Correct Answers -contribute most
to lift at high AoA
the LE device fail to extend on approach but the TE do extend normally. you would
expect what changes to approach alpha angle, drag selected approach speed and
cockpit cut-off angle compared to an approach with all high lift devices - Correct
Answers -lower alpha and drag, higher approach speeds and improved view over the
nose
describe the properties of a zap flap - Correct Answers -increases camber, drag and
wing area, requires nose up trim change
what are spoiler panels - Correct Answers -located just ahead of the TE flaps. deflection
of the roll spoilers on the right wing will see the right wing aileorn delfect upwards to
initiate a roll to the right
how do shockwaves form - Correct Answers -first over the upper wing surface where
the airflow reduces to below mach 1. the lower shockwave forms later but reaches the
TE before the upper shock wave
as speed increase beyond Mcrit - Correct Answers -the Centre of lift moves aft, lift
reduces and a nose-down pitch moment occurs (machtuck)
what is the order of event as speed increase - Correct Answers -Mcrit Mcdr, speed of
sound, Mdet
what are the qualities behind a normal shockwave - Correct Answers -temp and static
pressure rise, velocity and Mach decrease and density increases
what is dependent on the airflow direction during a shockwave - Correct Answers -
oblique experiences changes in direction
normal does not
qualities of high-flying jet aircraft featuring swept wings - Correct Answers -low speed
stall IAS increases cumulatively as altitude is gained
the aerodynamic ceiling for a given aircraft is - Correct Answers -lower with increased
turbulence and bank angle
, increased apparent gross weight does what if anything to the speed margin between
initial buffet speeds - Correct Answers -reduces it
an aircraft is crusing at a very high altitude and experiences buffet. this is - Correct
Answers -high or low speed buffet
to ensure correct flow direction is maintained in hydraulic system you would fit a -
Correct Answers -CHECK VALVE
what are the qualities of the pneumatic system - Correct Answers -the pneumatic
systems is lighter than the hydraulic systems
purpose of a shuttle valve - Correct Answers -are automatic which operate should
normal system pressure fail
do jet aircraft use electrical starter mechanisms - Correct Answers -no0o
what is the ideal humidity fir aircraft cabin - Correct Answers -60%
humidity level possible flying in jet aircraft - Correct Answers -30%
ideal temperature range for humans - Correct Answers -18-24
does bleed air extraction affect take off performance - Correct Answers -true during take
off and climb performance
what is an advantage of the air-cycle machine - Correct Answers -light weight but has
poor ground cooling
where is the lowest temperature achieved in the air cycle machine - Correct Answers -at
the expansion turbine outlet
to achieve a fail operation autopilot coupled ILS approach in a B767-300ER - Correct
Answers -three autopilot engage at 1500 radio altitude
what is the primary purpose of a super critical wing section - Correct Answers -
increases the critical drag rise number
coffin corner is best described as the situation where an aircraft is operating at such
high altitude that the difference between high and low speed buffet is only a few knots
what is the relationship effected by - Correct Answers -it is effected by aircraft weight
and loaf factors
what is the purpose of a TRU - Correct Answers -it converts AC to DC and steps down
the voltage
