Flight Instruments, Displays Flashcards
What is the purpose of the Display Processing Computers (DPC’s)?
The DPC interfaces with aircraft subsystems and sensors to collect data. The collected data is then processed and displayed on the flight deck Display Units, DU’s
- Each DPC is capable of providing completely independent sources of flight information presented on the Captain’s and First Officer’s displays.
How are outboard Display unit failures automatically handled?
When an outboard DU failure is sensed, the displays will automatically reconfigure to ensure that each pilot has a PFD, and that an Engine Display is shown
How are the standby instruments provided airspeed and altitude information?
Airspeed and Altitude are computed from pneumatic pressure data provided by direct connections to the auxiliary pitot and alternate static sources.
How is inertial position and track data provided to the FMC?
The ADIRU’s provide inertial position and track data to the FMC as well as attitude, altitude, and airspeed data to the displays
How is Maximum operating speed indicated on the PFD?
Red and black alternating hash marks displayed as a vertical bar
Bottom of the bar shows the maximum speed as limited by the lowest of the following:
*VMO/MHO
*Landing gear placards
*Flap placard speed
What does the VNAV speed band on the PFD indicate?
The VNAV Speed Band (magenta) indicates the FMC target airspeed during VNAV PTH descents.
- The bottom of the bar indicates the auto-throttle wake up speed.
- The top of the bar indicates the speed at which VNAV will change from VNAV PTH to VNAV SPD.
When do the Pitch Limit Indicators (PLI’s) display?
Eyebrows, Amber, PLI’s. Indicates the pitch limit, (Stick Shaker activation for existing conditions). They populate when: *Flaps are extended OR *Slow speed with flaps extended
How is the flight path angle and drift angle displayed on the PFD?
The Flight Path Vector (EFIS control panel).
* Flight path angle is displayed relative to the horizon line.
* Drift angle is displayed relative to display center.
How is standard pressure set on the altimeter?
By toggling the STD button on the BARO knob located on the EFIS panel.
What does ALT DISAGREE alert indicate?
The Captain and First Officer’s altitude values disagree by more than 200 feet for 5 continuous seconds.
Appears on both PFD’s and doesn’t show which altitude value is erroneous
What does IAS DISAGREE alert indicate?
The Captain and First Officer’s indicated airspeed disagree by more than 5 knots for 5 continuous seconds
Doesn’t show which one is wrong
What does the AOA DISAGREE alert indicate?
The Captain’s and First Officer’s AOA values disagree by more than 10 degrees for 10 continuous seconds
Doesn’t show which is erroneous
What does the solid green dot along the vertical flight path vector of the Vertical Situation Display (VSD) indicate?
The Range to Target Speed Dot (RTSD) green spot indicates where the aircraft will achieve the FMC or MCP target speed
Displayed at the end of the flight path vector as a hallow dot if the target speed will not be achieved within vector length
At what altitudes are decision gates on the VSD provided?
At 500 feet and 1,000 feet above field elevation
Suggested points where the aircraft should be configured, stable and on glide path
How is the HGS system controlled?
The HGS is controlled from a menu within the MCDU.
What standby instruments are available?
- The Standby magnetic compass.
- The Integrated Standby Flight Display (ISFD).
How is the Integrated Standby Flight Display (ISFD) powered?
The ISFD battery pack charger is normally powered by the Battery Bus.
Which displays utilize failure flags to display instrument failures?
The PFD
