Indicating/Recording Systems Flashcards
What is TO Inhibit and when does it begin & end?
Prevents failures that occur during the TO roll that do not impact the safety of the aircraft from being displayed to the pilots.
It is displayed in magenta on the lower EWD
It begins at TO power and ends at 1500ft
What is Landing Inhibit and when does it begin and end?
Prevents certain system failures from being displayed to the pilots during final approach.
Begin at 800ft and finishes when aircraft speed below 80kts
When does the Landing memo appear and disappear
Appears below 2000ft and disappears when aircraft speed below 80 kts
What does a down arrow on the status page mean?
It means the status page overflows onto another page.
Press the clear button to get to next page
When does the backup speed scale appear, what does it look like & how does it work?
Appears when all 3 ADRs fail and it replaced the usual PFD speed tape. It is based on AOA and by maintaining speed within the green band the aircraft will be at a safe speed based on the configuration.
If a display unit is flashing/flickering intermittently what does the QRH suggest as a likely cause & what is the suggested fix?
QRH suggests an intermittent electrical supply problem
If captain or upper DU affected switch off GEN 1, if FO or lower DU affected switch off GEN 2
If this solves problem leave off the associated GEN and start APU
If problem not solved turn GEN back on
If a DU unit is blank with it without large ‘F’ on screen what has happened?
DU itself may have failed, try on and off!
If doesn’t work use XFR switches or button
What are the consequences of one of the centre ECAM DUs failing?
Only EWD will be shown on whichever screen remains
If you want to display systems page must press and hold the relevant p/b
If extensive list of inoperative items on status page must release STS button and press again within 2 seconds
If a display unit shows ‘INVALID DATA’ across the screen what should you do?
Indicates that a DMC has failed
Use the DMC switching display DMC 3 info on Captain or FO side
What are the FWCs and how many are there?
2 FWC
They generate all aural voice warnings, including rad alt and DH callouts
Also generate master caution and warnings
FWC divides its functions into flight phase so some warnings and cautions are inhibited during certain phases of flight
How many flight phases are there with regards to the FWC?
10
TO Inhibit 3-5
Landing Inhibit 7-8
How many DMCs are there and what do they do?
3 Data Monitoring Computers take information from other sources and display it on the DUs
Should a failure of a DU occur the DMC will rearrange the screen to display critical information
The flight crew can also use the XFR switching to rearrange the DUs
If a DMC fails, flight crew can switch DMC to CAPT or FO to display DMC 3 info
What causes multiple undue ECAM warnings & cautions?
If one DMC stops functioning we may get lots of spurious ECAM alerts
If spurious can try switching DMCs
Except for the Vapp target, all speeds known as ‘Characteristic Speeds’ on the PFD are computed by the FACs, how do they do this?
FACs constantly calculate aircraft weight by comparing parameters including AOA, Thrust, IAS, CofG and from this work out VS1g (stall speed)
It then uses the stall speed to work out all other operating speeds, and this is what is displayed on the PFD speed tape
The FAC uses this technique up to 14500ft and after this uses the last calculated gross weight - fuel burn
What computes the speeds displayed on the MCDU and the PFD speed targets i.e V1, VR
The FMS computes these speeds based on aircraft gross weight computed according to the figures entered as ZFW/CG & FOB
This is why it is important these figures are entered correctly
