Flight instruments and displays Flashcards
What is the significance of the small white bug (sharks tooth) on the PFD Airspeed Indicator During takeoff? Approach?
Takeoff= v2 +15
Approach = -700 Vref + 15
Approach= -800/8MAX= vref+20
ON TAKEOFF what is the minimum speed for flap retraction?
Normally, the initial flap retraction will be made at V2 plus 20. V2 plus 15 is the minimum speed required for flap retraction except for a FLAPS 1 takeoff. For a flap 1 takeoff, begin flap retraction when reaching the flaps 1 maneuvering speed
limit bank angle to 15 degrees unitl reaching V2 plus 15
What does IAS DISAGREE alert indicate?
The CA and FO’s airspeed indications disagree by more than 5 KT for 5 continuous seconds
In the NG, what is the difference between a CDS MAINT alert and CDS FAULT altert?
CDS MAINT (WHITE)- dispatchable CDS fault has occurred. Displayed on the ground only, prior to start of the second engine
CDS FAULT (Amber)- a non dispatch able CDS fault has occurred. Video is reversed and displayed on the ground only, prior to the start of the second engine
DEU
DIsplays Electronic Unit
What does a NG DSPLAY SOURCE / MAX DSPLAY SOURCE 1 alert and the illumination of both EEC ALTN lights indicate which QRH checklist should be used
a DEU or DPC has failed. Loss of the DEU/DPC results in a loss of signal to both EECs. the EEC ALTN lights illuminate and both EECs go to alternate mode.
The root cause loss of the DEU/DPC would lead to the selection of the Display Source checklist but either the DISPLAY SOURCE QRH or EEC ALTERNATE MODE checklist would address the issue.
During flight below FL220 you observe a DSPLY SOURCE message on the primary flight display. Will the autopilot and/or flight director be affected?
Yes, Below FL220 available autopilot modes and FD commands will be affected depending on phase of flight and which AP is engaged.
DSPLYL SOURCE 1 or 2 indicates that DEU 1 or DEU 2 has failed.
Below FL 220 in a CLIMB or DESCENT with the failed side AP engaged:
-the FD pitch command bar is removed from both pilot displays
-the FD pitch command bar reappears at ALT ACQ
-the AP engages in CWS P
-LVL CHG, VNAV, and V/S are not available on the failed side A/P
If a DEU fails during LEVEL flight below FL 220 with the failed side AP engaged:
- climb or descent to a new altitude is only possible in CWS P
-initial climb or descent to a new MCP altitude is not possible in LVL CHG, VNAV or V/S with AP engaged
If a DEU fails on the opposite side as the engaged AP or while in manual F/D mode during climb or descent:
-the FD pitch command bar is removed from the Pilot Display on the FAILED side until ALT ACQ
-climb or descent is still possible in lvl change, VNAV, or V/S with A/P engaged
When VNAV is engaged, when will VNAV automatically switch from VNAV PTH to VNAV SPD?
When the airspeed exceeds the top of the VNAV Speed Band.
When passing TOD and using high target speeds, VNAV may revert to VNAV SPD to prevent overspeed
What does the lower limit of the VNAV speed band in the PFD trigger?
Lower limit will trigger autothrottle wakeup.
After performing the immediate action steps, QRC, and QRH for airspeed unreliable, what resource would you use to help determine pitch and thrust as you continue the flight?
Refer to the flight with Unreliable Airpseed table in Performance inflight chapter of the QRH.
DPC
Displays processing computer
CDS
Common displays system
