Avionics Flashcards
What is the normal heading source for each DBDI in flight?
The on-side IRS (IRS 1 - left, IRS 2 - right)
What is the backup heading source for each DBDI in flight?
IRS #3, indicated by a green “AHDG” indication on each DBDI
What is indicated by a “999” indication in the speed window on the flight guidance panel?
No valid auto-speed target is available
What is the default power-up heading source for each DBDI?
The flux valve (magnetic compass), indicated by an amber “STBY” on each DBDI
What is the normal order of the FMS pre-departure flow?
- NAV IDENT
- POS INIT
- FLIGHT PLAN
- PERF INIT / PERFORMANCE DATA
- DEPARTURE
- TAKEOFF INIT / TAKEOFF DATA
From where do the data acquisition units (DAUs) receive information?
- From the engine sensors
- Misc. aircraft systems such as fuel quantity.
When flying a “blue data” approach, what are the proper indications to show that the FMS is in approach mode?
- At 2 miles prior to the FAF / FAWP, the APRCH light must be illuminated on the CDU
- The missed approach prompt is not required but should be displayed at the 4L position on the CDU flight plan page
On a “blue data” approach, what is indicated by the illumination of the APRCH light on the FMS CDU? (4)
- FMS is the selected navigation source and
- aircraft position is 2 NM outside the FAF and the MAP on the FMS LSK 4L
- The FMS is using sensors approved for that type of approach
- A non-precision approach that is not localizer-based has been selected from the FMS navigation database
How is CDI scaling affected by the FMS in approach mode?
The CDI scaling changes from 5 NM to 1.5 NM either side of center.
(note: G-IV limitations require that all FMS approaches must be coupled to at least the flight director as the CDI does not scale to 0.3)
Is it possible to have both the DGRAD and the APRCH lights on the CDU illuminated at the same time?
No, the approach light will not be displayed if DGRAD has illuminated
After takeoff, when are the takeoff V-speeds replaced by VREF on the airspeed tape?
When accelerating above 200 knots and altitude above 400’ AGL
What conditions might cause the performance computers to delete the takeoff V-speeds after they have been “boxed” for takeoff?
Selecting DIRECT TO a waypoint on the ground
What is the sensor priority for the FMS, from highest to lowest?
GPS
DME / DME
VOR / DME
IRS
During an auto-throttle takeoff, when does the auto-throttle system go to “HOLD” mode?
At 60 knots indicated airspeed, regardless or power lever position or EPR setting
When are flight director command bars displayed on both PFDs? (3)
- TO or GA mode active
- Dual approach mode active (ILS below 1,200 feet AGL, both sides have ILS selected an tuned in respective radios)
- 2 failed symbol generators with the remaining one in NORM (two failed in ALT)
What action is required with a flight guidance computer (FGC) failure?
None, the other FGC takes over automatically; FGP selections remain as previously selected
What is the indication with a failed fault warning computer (FWC)?
A red “X” in the CAS message portion of DU 4 until the operative FWC is selected on the display controller SENSOR page
What is the indication with a failed digital air data computer (DADC)?
A red “X” on the airspeed, altitude, vertical speed and AOA indications on the affected side until the operative DADC is selected on the display controller SENSOR page
Note: After selection of the operative DADC, the Pressurization panel and Transponder should be checked to ensure an operative DADC is being used.
If a data acquisition unit (DAU) channel fails, how can the problem be rectified?
Select the operative channel of the affected DAU on the display controller SENSOR page
If the captain’s display controller becomes inoperative, what is the effect on the captain’s PFD and ND?
All indications will revert to the default power-up display controller values
When completing the FMS pre-departure flow, what are the required entries in PERF INIT before PERF DATA can be selected?
Cargo weight, number of pax and average pax weight on PERF INIT page 5/5
When completing the FMS pre-departure flow, what is indicated by “DEST FUEL REMAINING” on PERF DATA page 2/4?
The predicted fuel remaining at the destination, in thousands of pounds
What are the different configuration modes of the FMS? (4)
- DUAL - (FMSs share Active FltPlan, Perf, Pilot wpts, stored fltplans, offside radio tuning commands, temp comp config changes, TO / LDG fuel allowance data, custom DB mods, CDU config data, RNP value entries, Uplinked DL info, changes to bank factor)
- INITIATED TRANSFER (FMSs share pilot wpts, stored fltplans, offside radio tuning commands, temp comp config changes, TO / LDG fuel allowance data, custom DB mods, CDU config data, RNP value entries) FMSs can transfer on command (on last Active FLT PLAN page): Active Flt Plan, Active Flt Plan Edits, Perf Entries
- INDEPENDENT - (only offside radio tuning commands are transferred to the offside FMS automatically.)
- SINGLE - No data is transferred between FMSs.
What systems and indications might be affected by a DADC failure? (6)
- Airspeed
- Altimeter
- Vertical speed
- AOA
- Pressurization
- Transponder
What can be expected if an “unflagged” DADC failure (miscompare) occurs in flight?
The faulty DADC can be identified by reference to the standby flight instruments
On takeoff, when do the autothrottles set the power to the climb EPR target (CLB)?
Above 400 feet AGL with FLCH, VS or VNAV selected
What CAS message indicates a loss of the active lateral mode of navigation?
An amber or blue CPL DATA INVALID CAS message
What is the length of time that the cockpit voice recorder (CVR) records voice signals transmitted by the crew members?
30 minutes
