Flashcards in Mixed Question Feedback Deck (51):
Pressure sensing instruments from lowest to highest.
3. Pressure Capsules
What is a thermocouple
Junction of two dissimilar metals.
Float Type Fuel Gauge
- Simple design
Attitude, acceleration, temperature errors.
Function of a synchroscope
Ensures engines are running at the same speed. Reduces vibration
Bar to Psi
1 bar = 15 Psi
3 Phase Synchronous Motor Tachometer
- Frequency is proportional to transmitter drive speed.
- Speed indicating element is asynchronous; motor with a magnet.
ALTIMETER - pressures inside the aneroid capsules and casing?
Aneroid Capsules - VACUUM
Casing - Static
Basic Properties of a Gyroscope
Rigidity & Precession
Flux Valve in a Gyromagnetic Compass
Feeds the error detector
Gives Earth's Magnetic Field Direction
What is the spin axis of a Gyroscope in the Attitude Indicator?
Fail Passive vs Fail Operational
Fail Passive - Landing will not be completed automatically, but no out of trim will occur nor flight path deviation.
Fail Operational - "FAIL SAFE" - Can still carry out the landing even after failure.
Automatic Trim - which axis (as a basic principle)
Around pitch axis only
What are the components of a Flight Data Recorder
Chip & Magnetic Tape
What data is used by the autopilot in "PITCH HOLD" setting
Data from the ATTITUDE REFERENCE SYSTEM
Relationship between Power, Torque & RPM
Power = Torque x RPM
What type of pressure sensing device measures HYDRAULIC PRESSURE?
TRANSDUCER equipped with an INDIRECT INDICATOR
Which instruments will be affected if we have a power failure?
Magnetic Compass, CDI
Which type of Modulation does the RADIO ALTIMETER operate on?
In a Turn-indicator, the measurement of rate-of-turn consists for :
Low bank angles, in measuring the yaw rate
Mode Selector switches of an inertial reference system (IRS) mode panel
OFF - ALIGN - NAV - ATT
What is the source of Magnetic Variation information in a Flight Management System (FMS)?
Stored in each IRS memory; it is applied to the true heading calculated by the respective IRS.
FMS aircraft database is updated:
On software update.
Inputs to GPWS
Easily recalled by the mnemonic 'RAFN'
R - radio altimeter
A - air data computer (includes vertical speed and pressure altitude)
F - flaps/gear (configuration)
N - Nav receiver (ILS glideslope deviation)
The resultant of the first integration from the north/south in an inertial navigation system (INS) in the NAV MODE is:
Velocity along the local meridian.
Advantages of a SINGLE PHASE A.C Generator Tachometer (RPM Gauge)
Suppression of spurious signals
Independence of information.
Suffers however from resistance & transmission issues.
Principle of a Magnetic Tachometer (RPM GAUGE)
Permanent magnet turning inside a non-magnetic drag cup.
What does an Electric Torque Meter measure?
Twisting of Engine Output Shaft.
Faster twisting (spinning), greater voltage, greater reading.
With the absence of Instrument & position Error, CAS is equal to?
Temperature Probe measures:
TAT. Ram Rise + Kr needed for SAT
- What instruments use it
A.C Voltage - 487.5Hz
Flux Gate compass / DGI
Accuracy is less than 05%
To obtain instantaneous speed from acceleration?
Integrate acceleration. Initial speed must be known.
How does an Autopilot "GUIDANCE" function?
Monitors movement of CG in 3D space
Yaw Damper shows information to the pilot on:
Yaw Damper action on Rudder
What is the normal operating mode of an FMC?
Dual Mode - 2 independent MCDUs that exchange data.
Frequency of a Radio Altimeter
4.4 GHz - SHF - Centimetric
Artificial Horizon - degrees of freedom & around which axis?
2 Degrees of Freedom - Vertical Axis
What is an anemometer calibrated to & what does it assume?
Saint-Venant - air compressiblity
What does a turn indicator measure? (low/high bank angles), rate of what?
Low bank angles, rate of yaw.
What does the ACMS consist of?
Aircraft Condition Monitoring System
Data management unit, recording device, printer
Types of vibration sensors
Piezoelectric crystals & magnets.
What is the sideslip indication on the PFD generated by?
Mode 2 GPWS - Excessive Terrain Closure. What is the aural warning associated?
"TERRAIN" - aural warning.
What does a laser gyro measure?
Intruding aircraft is equipped with a Mode C Transponder - what traffic alerts will TCAS generate?
TA/RA as normal.
What does a Gyromagnetic Torque Motor do?
Causes the DG to PRECESS.
An airspeed indicator includes a capsule; inside this capsule is:
Total pressure in the capsule, static pressure on the outside.
Which loop system controls the movement around the centre of gravity?
This is the most basic stability function of the autopilot system and therefore it uses the inner loop system and actuators. It is a closed loop system.
How is the radio position determined by the FMC in the B737-400 Electronic Flight Instrument System?
DME/DME (ρ-ρ) VOR/DME (θ-ρ)
The measurement of the turbine temperature or of the EGT is carried out at the:
Outlet of the high pressure stage of turbine.
When disengaging the autopilot, the function providing a smooth 'hand-over' is the:
Automatic pitch trim