INSTRUMENTS / AVIONICS SYSTEMS 11.5.2 Flashcards
When are autopilot upper modes available?
When the autopilot is engaged to the CMD (command)
How does the pilot know the aircraft is not correctly trimmed?
When a steady elevator deflection is required to maintain a steady pitch attitude
Which mode of the thrust rating system provides the maximum thrust value for permanent operation?
Max. Continuous Thrust (MCT)
What does the autopilot engage interlock monitor?
It monitors all signals the AP needs for the inner loop in CMD and CWS
Which auto throttle controlling mode is used during cruise?
The auto throttle uses the speed mode and controls either a selected or FMC calculated speed or Mach number
Why is an antenna coupler used on a HF communication system?
To make sure the pat the antenna length is electronically matched to the frequency in use
Which statement correctly represents the relationship of frequency and antenna size?
The higher the frequency, the shorter the antenna
Which statement is true for ACARS?
It is used for manual and automatic data transfers between the aircraft and the ground in both directions
What does the cockpit voice recorder (CVR) record?
Captain, F/O, and 3rd crew member audio signals and the audio from the area microphone
Why are static dischargers fitted to an aircraft?
To discharge high static charges in flight, which generate high voltages and disturb radio reception
Where is the weather radar scanner located?
Under the nose radome and transmits the radar beam in a 180° sweep in front of the aircraft
What is the purpose of the 2 antennas fitted in an ADF system?
2 antenna signals are required to determine the correct direction
What do the different colours indicate on the weather radar screen?
Red- worst weather conditions
Yellow & green- less severe conditions
What is automatic VOR?
The bearing is automatically indicated on the RMI OR ND
Given an aircraft without a pressurised cabin, on which a leak has occurred in the static system while the aircraft is in level flight, which cockpit indications do you get? (Venturi effect decreases cabin pressure)
Air Speed Indication (ASI)
Altimeter shows slightly increasing values
VSI shows correct data
Why is a band pass filter fitted in the yaw damper computer?
To filter out any steady state signal
Which auto throttle mode is automatically selected when the autopilot is in the vertical speed mode during climb?
Thrust mode
How can a heading on the control panel be selected?
By using heading select
Why are radio frequency (RF) lines used?
To transport a radio signal without disturbances
What is the service inter-phone used for?
To communicate with maintenance via jacks around the aircraft
What is the frequency 121.5 MHz used for?
VHF emergency transmissions
Which method is used by the ILS receiver to determine which marker beacon the aircraft is flying over?
Each beacon has its own characteristic modulation and morse code
How does DME measure distance?
The time between the interrogation and reply is proportional to the distance of the station
What is the purpose of the TA setting on the TCAS control panel?
It gives traffic advisories and shows the white and amber traffic lights on the ND. RA’s are not available
