BGS post its - Inst Flashcards
What do capacitor fuel guages measure?
The charge held in the capacitors
Do IRS/INS systems search for longitude?
no
when does gimbal error occur?
when gimbals arent completely at 90deg to eachother, like during banking.
What can we deduced with CAS and pressure altitude?
EAS
is the FMS approved for ILS approaches?
no
What is quadrantal deviation corrected by?
pairs of permanent magnets
What do paddle wheels or mechanical fuel flow meters measure?
the volumetric flow via counting the frequency of impulses from the impeller
What is the blue radial line on an ASI an indication of?
Best single engine rate of climb speed (Vyse)
What is the basic on-board DL comms system made up of?
comms management unit (CMU)
multi-purpose control and display unit (MCDU)
comms unit (HF, VHF, Satcom)
what is maintained after CWS?
Flight attitude in that moment
NOT track
What is the equation that relates SAT to TAT?
SAT = TAT/(1 + 0.2KrM2)
What does FADEC provide?
fully automatic engine starting and thrust reverser control
What is the order of operation types for dual operation FMSs?
normally dual mode with a master and slave FMS
if a large discrepancy exists then they act seperately
if one FMS fails completely then both displays will run from one FMS
How does the autopilot roll-out mode maintain rwy centreline?
controlling rudder/nose wheel steering
What is the disadvantage of single phase AC tachogennys?
the importance of line resistance on the information value.
What kind of pressures are aneroid capsules used to measure?
low pressures (eg air intake pressure of gas turbine engine/ manifold pressure)
What does the compressibility correction to CAS to get EAS always do to the value and what does it depend on?
it always decreases it (-ve) and it only depends on speed
What is FMS VNAV management based on?
barometric altitude input from the ADC
What are the advantages of a DC tachogenny?
easy transmission of info an no external electrical power supply required.
Does the nav display show decision height?
no
What is a data bus?
something that transfers digital signal across various systems
What happens to the rad alt indication when there is an error on approach?
the entire indication is removed.
Where does IRS get the information required to calculate mag heading from the true heading measured by the system?
from its own internal memory.
what do guidance functions of A/P monitor?
movements of the aircraft CG in 3D space
What do basic functions of A/P monitor?
orientation of the A/C around it’s CG.
does the FMS flight plan/leg page display A/C position?
no
are yaw dampers able to be used to balance a turn?
no - they are not designed for that.
during autoland, what does A/Ps use to decide vertical speed?
rad alt height.
what is the indicated by the start and end of the green scale on an ASI?
start - Vs1
end - Vno
how much deviation from a flight path or attitude will failure of a fail-passive system cause?
no significant deviation.
is a gyro magnetic compass free in azimuth?
no it is slaved/tied to the horizontal
What kind of things can an A/P system provide?
functions of piloting and guidance of A/C in horizontal and vertical planes.
what does a thermocouple produce with an increase in temperature?
a voltage
what error in pitch will an airtificial horizon always produce in a turn and how does it vary?
it always shows pitch up through a full 360 being worst at 180deg and none and 360deg.
In a steep turn, what is the northerly turning error on a magnetic compass in the NH equal to?
180deg on a 090 hdg in a right turn
Where is the temperature measured by the CHT probe measured from?
within the hottest cylinder.
When does autosynchronisation prevent snatch?
upon engaging the A/P
When does auto trim / pitch prevent snatch?
upon disengagement of A/P
What are the requirements of the microphone in a CVR?
it must be in compliance with shock and fire resistance standards.
What are the EGT parameters shown on an EFIS?
Instantaneous EGT
max continuous EGT limit
max TO EGT limit
max start EGT limit
how is total fuel consumption obtained?
by integrating fuel flow with time.
What are the basic/inner loop functions of A/P?
pitch attitude hold
horizontal wing/roll hold
What are the guidance/command/flightpath/outer loop modes of A/P?
Altitude hold
Airspeed/M hold
V/S hold
hdg hold
ILS tracking
VOR tracking
LNAV
VNAV
what do vertical/lateral flight path modes not include?
speed mdoes
What are the speed modes of autopilot?
Pitch attiude hold
airspeed/M hold
V/S hold
What is the main advantage of ratiometer type temperature indicators?
they carry out an independant measurement of the supply voltage.
What does the CPDLC function consist of for FANS application?
exchanging messages relative to
- route modification
- crossing contraints
- transfer of ATC center
- speed changes
out of static and pitot tubes, which can be affected by position error?
both
what is the relationship between the temperature of the hot junction and EMF of a thermocouple?
E = K x Th
E - EMF
Th - temp of hot junction
K - constant
What do capacity fuel gauges measure?
mass from SG and volume which is independant of temperature.
In a climb, how does the computer keep thrust constant?
by adjusting N1
What are the FMS vertical command outputs?
flight path angle
speed target.
