737 Flight Instruments Flashcards
Explain function of DISPLAYS SOURCE selector.
AUTO - allows DEU 1 to drive the captain’s outboard, captain’s inboard and upper display units while DEU 2 drives the FO’s outboard, inboard and lower display units. Provides automatic switching from both DEUs to one DEU in case of single DEU failure
ALL ON 1 or 2 - (used on the ground for maintenance purposes) - selects either DEU 1 or DEU 2 to drive all 6 displays
What is the function of the DISPLAYS CONTROL PANEL Select switch.
It would be better if this were called the EFIS DISPLAYS CONTROL PANEL
NORMAL - Left EFIS control panel controls captain’s displays and the right EFIS control panel controls FO’s displays
BOTH ON 1 or BOTH ON 2 - both pilot’s displays are set to the selected pilot’s EFIS control panel
NOTE: When in the NORMAL position and a failure of one of the EFIS control panels occurs, an amber DISPLAYS CONTROL PANEL annunciation lights up in the lower right corner of the PFD showing a failure of the associated EFIS control panel
Describe the alert associated with a DEU failure.
DSPLY SOURCE (amber) on shows up on the lower left corner of the both PFDs.
NOTE: If a DEU fails, the remaining DEU automatically supplies data to all six displays.
What does the PLI (pitch limit indicator) display on the PFD?
Indicates max pitch limit at which the stick shaker will activate for the existing flight conditions
Locate on a PFD the selected MCP altitude, airspeed, heading and V/S.
All commanded information is displayed in magenta on the PFD.
What is the meaning of the Max Speed Bar on the airspeed tape?
Bottom of the bar indicates the maximum speed as limit by the lowest of the following.
- Vmo/Mmo
- landing gear placard speed
- flap placard speed
What is the meaning of the minimum speed bar on the airspeed tape?
Top of bar indicates the speed at which stick shaker occurs
What is the meaning of the Speed Trend Vector?
tip of green arrow indicates predicted airspeed in the next 10 seconds.
What is the Maximum Maneuver Speed Bar (amber) when flaps are set between 1 and 15 degrees?
When the flaps are being extended during an approach, the Maximum Maneuvering Speed indication displays the limit for the next normal flap setting.
For Example:
With flaps 5 selected, the Maximum Maneuver Speed indication lowers to the maximum flap speed for flaps 15.
The bar is removed when the flap lever is moved to flaps 40.
What is the meaning of the Maximum Maneuver Speed Bar when the flaps are up?
Bottom of the bar indicates the airspeed that provides a 1.3g maneuver margin to high speed buffet. One place it might be displayed is at high altitude with relatively high gross weight
Explain the meaning of the Minimum Maneuver Speed bar.
Top of bar indicates minimum maneuver speed
What is the speed of the single white bug displayed during takeoff?
It represents V2 + 15.
NOTE: It provides a margin to the stick shaker for an inadvertent 15 degree overshoot beyond the normal 25 degree angle of bank
What speed does the single white bug represent during approach?
It represents VREF +20 Kts as set in the FMC.
The idea is that it provides a speed reference during go around.
Where can Radio Altimeter Altitude be found on the PFD?
When is it displayed?
At the bottom of the PFD Attitude indicator.
- Comes on below 2500ft AGL
- It is highlighted by a box for 10 seconds when it first comes on in a descent.
- Turns amber when below radio altitude minimums
Describe the Landing Altitude indicator (yellow hashed box) What does it show?
Cross hatched area indicates the FMC landing altitude for the destination airport - OR - the landing altitude for departure runway or airport.
Describe the PFD VSI.
- White pointer that moves to indicate VS
- Selected Vertical Speed Bug (magenta) indicates the speed selected in the MCP vertical speed window but only with V/S engaged.
- Displays vertical speed (in numbers) when greater than 400 fpm. These numbers are displayed above the tape when climbing and below when descending.
- Tape turns red when used to show vertical speeds to avoid during a TCAS resolution advisory.
Where is the PFD approach reference indication?
- Upper left hand corner of the PFD
- Displays ILS/IAN identifier or frequency, front course and distance
NOTE: if the frequency disagree on the FO and Caps PFDs the freq turns amber with a line through it. Same thing for course disagreement.
What are the indications of a Resolution Advisory and where are they displayed
- There will be an aural direction such as “CLIMB CLIMB”
- Intruder aircraft symbol turns red on the Navigation Display (ND) in MAP mode.
- Avoidance maneuver area displayed in red on PFD.
- TCAS Vertical Speed Tape turns red to indicate VSI values to avoid or exit during an RA.
Describe the Slip/Skid indicator
Displaces beneath the bank pointer to indicate slip or skid
- fills white at full scale deflection
- turns amber if bank angle is 35 degrees or more
- also fills amber if slip.skid indication is at full scale deflection (“I’ve nothin more to give ya Captain - Scotty)
Where are wind speed and direction displayed?
Top left of ND underneath GS and TAS.
Where is the Active Waypoint/ETA/Distance-To-Go displayed on the ND?
Top RH corners of the ND in MAP or PLAN modes.
What are the PFD failure flags for inoperative flight instruments?
A Boxed amber alert replaces failed flight instruments.
What is the location and purpose of the PFD Scale ID annunciation?
displayed at the top left corner of ADI and indicates the source of displayed deviation scale.
What indications will be displayed to show excessive glide slope and localizer deviation on the PFD?
At low radio altitudes (with autopilot engaged), the appropriate scale turns amber and the pointer flashes to indicate excessive glide slope/glide path or localizer/FAC deviation.
Describe the PFD Navigation Performance Scale (NPS) indications
See Graphic
How is the Vertical Situation Display accessed?
By pressing the EFIS Control Panel CTR switch twice. Shows up on the ND
What does the VSD Terrain Profile Line show?
- The highest points of the terrain below and ahead
- True altitude separation between the airplane and the terrain
- VSD terrain uses the same color coding as that used in the GPWS.
Can the aircraft be dispatched if there is a CDS fault (a fault in the DEU) displayed on the ground?
The aircraft cannot be dispatched.
What does the FPV (flight path vector) button show when it is pushed?
A small white circle with lines out the side and the top.
This symbol shows the airplane’s current flight path angle relative to the horizon and drift angle relative to center.
