11.5 Flashcards
if an aircraft is IFR certified what must be different about the captain and first officer?
systems fed separately i.e altimeter, horizon etc on different systems
where is the pfd found in a glass cockpit?
outboard on both captain and first officers side
how many screens are on a basic EFIS system?
6
what are the basic T arrangement instruments and what are their positions?
top left: asi
top middle: adi
top right: alt
bottom left: turn bank indicator
bottom middle: hsi
bottom right: vsi
EADI can also be referred to as?
PFD -> primary flight display
EHSI can also be referred to as?
ND -> navigation display
what is 1 atm in HPA and inches of mercury?
HPA -> 1013.25
Inches of mercury -> 29.92
what instruments use pressure to display headings?
ALT, ASI, VSI
how many degrees does temp decrease per 1000ft?
2 degrees
what is the standard temp at sea level?
15 degrees
what pressure do altimeter use to display altitude?
static pressure
what is the pressure at 18,000, 36,000 and 54,000 compared to sea level?
18,000 -> 50%
36,000 -> 25%
54,000 -> 12.5%
are altimeters more or less accurate at low alts?
less accurate
what is used at low altitude?
radio altimeter
what does the transducer do in the radio altimeter?
convert analogue to digital
what happens to the (aneroid) bellows as alt increases?
expand mechanically linked to a pointer
why are bellows corrugated?
more sensitive
where is static pressure fed in an altimeter?
the case
large aircraft don’t have bellows what is used instead?
air data computer
why does the barometric attitude need changing?
pressure differs locally
in cruise what should the Q code be changed to?
from QFE/QNH to QNE
what is being fed into the asi?
pitot and static
what is the pitot probe connected to?
bellows/aneroid capsule
where is the static pressured fed to in an asi?
the case
what do the green, yellow and white band mean on an asi?
Green -> normal op range
yellow -> caution range only in smooth air
white -> full flap op range
airspeed limit depends on what?
VMO -> velocity max
MMO -> max mach
how does a vsi work?
static pressure into case and calibrated metering unit. utilising differential pressure
what is the problem with a vsi?
there is a lag
what is a mach meter?
ration of true airspeed to speed of sound
what is another name for SAT and what is SAT?
outside air temp
temp of undisturbed air
where is the only place where TAT and SAT are the same?
TAT is usually higher
TAT+SAT same on ground
where would TAT and SAT be displayed?
ECAM
what instruments require pitot and/or static
ALT static
ASI pitot + static
VSI static
where are static points located?
area of smooth airflow to allow undisturbed measurements of static pressure
what is the difference between the measured and real static pressure?
static source error
what causes SSE
fuselage shape
speed
configuration
how is SSE rectified?
with an ADC
when would static ports be covered?
cleaning, painting
what is the combined adc and fru?
air data inertial reference unit
what effect does side slip have on the static port?
gives a higher than normal pressure
how is the static pressure difference corrected during a side slip?
via points on either side of the fuselage, cross porting tube averages the pressure
what does the baffle prevent in the pitot probe?
containment ingress
what are some additional features of a pitot probe?
drain hole, heater to prevent ice
what does the alternate static selector valve do?
allows captain to use co pilots flight controls in case of failure
aircraft that fly at higher speeds and altitudes require what extra instruments?
true airspeed
air temp indicator
mach meter
any data sent to ECAM is sent via what?
ARINC 429
some aircraft have a third adc what is the purpose of this?
checks info and compare from adi 1 and adi 2 if one reads incorrect it is taken offline. “watch dogging” and “cross talking”
what is hot standby?
ready to use autopilot come online if needed
what do air data modules do?
pass air pressure directly into digital data word
why is the air data modules located near the static port?
save weight
what does the DME do?
display management computer takes data from ARINC 429 and converts to graphics
when would a leak test be performed?
after the system has been disturbed
when is the Q code changed to QNE?
transition level
what does encoding altimeter do?
sends a digital code to the aircrafts ATC transponder. it replies to ATC radar with altitude data gives who and how high
what does a servo altimeter work off?
induction pick off E and I bar
what is another example of the E and I bar?
linear variable differential transducer
calibrated metering unit is also called?
capillary tube
what is added to a VSI to alleviate lag (IVSI)?
dashpot -> weight between 2 springs
how long does it take a gyro to run down?
up to 20 mins
ADI’s utilise what type of gyro?
vertical axes gyro
what does vertical and horizontal refer to in vertical and horizontal gyro?
the axes the mass move around
HSI use what type of gyro?
horizontal/directional gyro
when would a rate gyro be used?
rate of turn indicator
how many laser rate gyros are needed for roll pitch and yaw info
3 gyros
what is the standard gyro powered by?
the battery
what 3 things affect the rigidity?
its mass
rotational speed
distance between the axis and the centre of mass
what factor is used to improve rigidity of the aircraft?
the rotational speed 20rpm to 24rpm
gyros have how many gimbles to provide an indication of aircrafts attitude?
one or two
what dictates the degrees of freedom?
number of gimbles
what gyros are needed on aircraft?
earth tied gyro
how many degrees of freedom does a rate gyro have?
one
a rate gyro will have how many degrees of freedom when held by springs?
1.5
what is a tied gyro?
gyro about a fixed axis
what is rigidity?
a gyros ability to maintain its axis
gyro precision depends on what?
axes that force is inputted to as reaction is 90 degrees to this
direction of spin precision felt 90 degrees to force some direction as spin
what type of gyro is a laser ring gyro?
rate gyro
how many gyros are in an ADIRU?
3 laser ring one for each axis
what is gyro wonder?
deviation from the fixed axis drift, topple depending on axis
what is gyro wonder caused by?
imbalances can be caused by wear and tear
what one the advantages of laser ring gyros?
less maintenance
no moving parts
What will disturb the back up compass on the aircraft?
Mag fields from systems
how does a laser ring gyro work?
difference in time of arrival at detectors, proportional to the aircraft movement
the IRS has how many RLG and accelerometers, where are these located?
3 RLG
3 accelerometers
longitudinal axis
what are the 3 methods of correcting wander?
pendulous vane
rotating balls
electrolytic switches
what is given on the HSI?
Heading
glidescope
localiser
weather (EHSI)
to from indicator
course selector point
how are turn and slip indicators powered?
28vdc
what does a turn and slip indicator not show?
pitch
how do you know you are in a co-ordinated turn?
the bubble will remain in the middle
standby compasses are known as what?
E2B
what does the lubber line show?
the point at which an aircraft is pointing
what are the two types of heading?
true north
magnetic north
what is variation?
difference between true north and magnetic north
what occurs to the magnets as their position with respect to magnetic north changes
inclination, retardant at certain angles
all compasses point to what?
magnetic north
how do you remember deviation and variation?
Cadburys - compass
dairy - deviation
milk - magnetic
very - variation
tasty - true
where will the flux detectors be found?
wing tips
how must all magnetic direction indicators be installed?
so that the accuracy is not excessively affected by aeroplanes magnetic fields or vibration
what can be said about hard iron magnetism?
permanent form of magnetism
hard to de-magnetise
easy to magnetise
what can be said about soft iron magnetism?
temporary magnetism
what does a direct reading compass contain?
all parts necessary to read magnetic heading
no electrical except light
why is the direct reading compass filled with fluid?
to dampen the compass scale movements
what is the purpose of the expansion unit direct reading compass?
compensates for fluid expansion by temperature changes
where is the direct reading compass located and why?
visible from each pilot seat
when does a direct reading compass read perfectly?
level flight
constant speed
what is the purpose of a compass deviation card?
for pilots to make adjustments in flight
the cable for the light in the compass is what to stop magnetism interference?
screened and trusted
what eliminates the problems with direct reading compasses?
directional gyro
what is the main component of a remote compass?
flux valve located at wing tips or vertical stabilisers
what do modern aircraft with IVS and GPS not require?
compass swing
where will a compass swing be performed?
designated compass swing base
what is the flux valve connected to?
remote compass
what compensates for SSE?
ADC
when will a stall warning go off?
before a stall
is alpha max a constant?
no charges with speed and configuration
where must the stall warning operate?
at least 5 kts or 5% above the stall speed
AOA info is taken from what?
AOA vane / Alpha vane
what are the warnings given?
audible and visual