Avionics Flashcards
- Describe Modular Avionics Units (MAUs).
They’re the main computers and processors that control most avionics related applications on aircraft.
- Which display units (DUs) are referred to as Multifunction Displays (MFDs)?
DU #2 and #3
- What part display is cursor restricted from entering?
ADI and PEI; otherwise, it can move anywhere in a display window on its associated DUs.
- What happens if both cursors are selected to the same DU?
Last active cursor has exclusive control in making selections within the display in which both cursors reside.
- What’s the purpose of Guidance Panel?
It provides most of controls for operation of Automatic Flight Control System (AFCS).
- What does an amber MAG2 indicate on both PFDs?
It alerts the crew that both pilots are using same source for heading information: in this case, IRS #2.
- What does an amber RA2 indicate on both PFDs?
It alerts the crew that both pilots’ flight instruments are receiving radio altimeter data from same source.
- What’s the purpose of 121.5 EMER guarded physical switch located on side wall above oxygen mask?
Enables selection of emergency frequency for total TSC failure.
- What happens with selection of Call Inhibit?
Prevents GCMS related messages from displaying on CAS display.
- What’s the normal location of primary engine instruments?
DU2 upper.
- What’s the normal location of CAS display?
DU3 upper.
- What’s the restriction on selection of full windows on DU2 and DU3?
Cannot be selected on both DU2 and DU3 at the same time.
- What functions are available with Phase-Of-Flight (POF) presets?
They can be selected, stored, and reset.
- What’s the source of HUD symbols?
HUD computer.
- What’s the source of video image?
EVS image comes from a camera that uses infrared technology and is optimized to detect runway lighting; Synthetic Vision synthesizes flight information from multiple onboard databases, GPS and inertial reference systems into a complete, easy-to-understand 3-D rendering of forward terrain.
- How should cloth cover be removed from combiner?
Rockwell Collins recommends removing cloth cover after moving combiner to operating position. In like fashion, they recommend reattaching cloth cover before moving combiner to stow position.
- How would you know you haven’t placed combiner in correct operating position?
“ALIGN HUD” message appears on combiner display. If this occurs, carefully reposition combiner glass and allow it to snap into detents. Don’t use HUD if “ALIGN HUD” message continues to be displayed.
- Why does combiner have a breakaway position?
It’s a safety feature that allows combiner glass to rotate toward windscreen with head impact and lock in place during sudden aircraft deceleration. This minimizes head injury.
- What do top “T” and bottom inverted “T” represent on combiner during HUD Press and Hold test?
Upper and lower limit of data displayed on HUD.
- What’s the primary symbol used to control aircraft with the HUD?
Flight Path Vector (FPV)
- What does Aircraft Reference symbol (or Boresight symbol) represent on HUD?
Projected centerline of aircraft (boresight).
- What’s the difference between HUD uncaged and caged modes?
In UNCAGED mode, FPV is free to roam horizontally and vertically. In CAGED mode, FPV is free to move vertically; however, it’s locked in horizontal center. In CAGED mode, FPV indicates plane’s heading and ghost FPV represents track. In UNCAGED mode, boresight represents heading and FPV represents track.
- HUD symbols are described as being either conformal or non-conformal. What’s the difference?
Conformal symbol has real-world counterpart (e.g., the horizon line represents the horizon degree for degree). Altitude dial is considered non-conformal since it doesn’t represent anything in real world.
- Why does horizon line flash on HUD at nose high and nose low attitudes?
To indicate non-conformity.