01/18/23 Flight instruments, Displays Flashcards
What directly provides inertial position and track data to the associated FMC?
Air Data Inertial Reference Units (ADIRUs)
The ADIRUs provide inertial position and track data to the FMC as well as attitude, altitude and airspeed data to the displays.
If both Captain and FO pitot tubes are inoperative (damaged/blocked), how is airspeed provided?
The remaining Auxiliary Pitot Probe and Alternate Static Ports provide pitot and static pressure to the standby instruments.
The Auxiliary Pitot Probe is located on the First Officer’s side of the aircraft.
What are the standby instruments?
The Standby Flight Instruments include:
• Standby Magnetic Compass
• Standby Attitude Indicator
• Integrated Standby Flight Display (ISFD)
• Standby Altimeter / Airspeed Indicator
• Standby Radio Magnetic Indicator
How is the Integrated Standby Flight Display battery pack and charger powered?
The Battery Bus normally powers the ISFD through a dedicated Battery Pack and Battery Charger. The Battery Pack provides power to the ISFD when power from the Battery Bus is not available. The Battery Charger keeps the Battery Pack charged any time electrical power is available on the Battery Bus.
Battery Pack can provide 28 volts DC power to the ISFD for 150 minutes.
If the outboard display fails, is automatic switching available? If so, where is the PFD displayed?
Yes, on the inboard display.
If an outboard display unit fails, the PFD is automatically displayed on the inboard display unit and the outboard display unit blanks
What indicates maximum operating speed?
The Maximum (Vmax) Speed is indicated as red and black alternating hashmarks forming a vertical bar. The bottom of the bar indicates the maximum safe design operating speed as calculated by the SMYD, and is the least value of:
• Vmo/Mmo
• landing gear placard speed
• flap placard speed
How are maneuver speeds indicated?
Amber bars indicate max and min maneuver speeds
Green Flap Maneuver speeds are for displayed flap position.
With dual FMC failures, how are airspeeds set for takeoff and landing?
SPD REF (Speed Reference) Selector (Outer Knob) sets the Reference Airspeed Bugs on the Airspeed Indication when the FMC is inop.
How is the flight path angle and drift angle displayed on the PFD?
Flight Path Vector (FPV) Indication (white)
FPV displays the Flight Path Angle and Drift when selected on the EFIS Control Panel. The Flight Path Angle is displayed relative to the Horizon Line, and the Drift Angle is displayed relative to the display center.
What are Pitch Limit Indicators, and when do they populate?
Pitch Limit (amber) Indication (PLI) indicates the pitch limit (Stick Shaker activation for existing flight conditions) as calculated by the SMYD.
The PLI also represents safe maneuver margins for pitch control during maximum performance climbs and windshear escape maneuvers.
It is displayed when:
• flaps are extended, or
• airspeed approaches Stick Shaker activation for the existing flight conditions, regardless of flap position
What does pushing STD on the EFIS control panel do?
selects the standard barometric setting (29.92 inches Hg/1013 HPA) for barometric altitude reference and STD is displayed.
What is the difference in the CDS alerts on the PFD and when would you see them?
• CDS MAINT (white) – A dispatchable CDS fault has occurred. Displayed on the ground only, prior to start of the second engine.
• CDS FAULT (amber) – A non-dispatchable CDS fault has occurred. Displayed on the ground only, prior to start of the second engine.
What causes the airspeed (IAS Disagree) alert?
More than 5 knots for 5 continuous seconds
What causes the altitude (ALT DISAGREE) alert?
More than 200’ difference for more than 5 continuous seconds
What causes the angle of attack (AOA DISAGREE) alert?
More than 10 degrees for MORE than 10 continuous seconds
Using the Vertical Situation Display (VSD), how would you know if you will achieve target speed within a certain distance?
The green dot
Range to Target Speed Dot (RTSD)
On the VSD, altitude gates are provided at what altitude on an approach path?
500’ and 1000’ AFE
