Flashcards in Flight Instruments, Displays Deck (71):
What systems feed current aircraft state information into the EFIS? (2)
1. Two ADCs (Air Data Computers)
2. Three IRS
Which SGs provide for which displays?
Left SG for the Captain, Right SG for the Co-pilot, and centre SG is a back up for both
What IRS supply each ADI?
Left = Captain, Right = Co-pilot
How many degrees rotation allowable in each axis for the IRS?
Explain when and how the ILS deviation works on the ADI? (3)
When is it inhibited for G/S?
1. Active below 500ft
2. Alert is displayed if significant deviation occurs on either LLZ or G/S (pointer turns amber and flashes)
3. When deviating from LLZ the rising runway stem flashes
G/S inhibited below 100ft
When does the rising runway appear on ADI? (2)
When LLZ pointer is displayed and radalt below 2500ft
When does RADALT start displaying?
When does radio altitude dial appear on ADI?
Once below 1000ft on approach
When does pitch limit indicator appear on ADI?
When flaps are extended and derived from stall warning computer to coincide with stick shaker pitch
Where is groundspeed on ADI derived from? (two sources, which is primary?)
FMC or IRS - FMC is primary
During non-normal conditions can the target speed be below the minimum manoeuvring speed?
Where does HSI get is heading reference data from?
What headings ar up for the following modes?
1. Track up
2. Heading up
3. Heading up
4. True North up
When does G/S scale and pointer not display on ADI? (3)
1. When ILS frequency not selected
2. Glideslope unusable
3. When track and ILS front course differ by more than 90deg
When does rising runway start to rise?
What systems does the EFIS consist of? (4)
1. Three symbol generators (SGs - L,C, and R)
2. Two ADIs
3. Two HSIs
4. Two control panels (CPs)
What is VF (F on ADI speed tape), when does it appear and when does it blank?
Min manoeuvring speed for current flap setting, appears 10sec after take off, and goes blank above 20000ft
How is minimum manoeuvring speed shown, what is it?
Top of amber bar and gives 1.3g manoeuvre capability to stick shaker buffet below 20000ft (1.3g to low speed buffet above 20000ft)
What AoB does 1.3g manoeuvre capability occur at in level flight?
How min operating speed shown on speed tape and what does it mean?
Red bars (low speed) on speed tape and indicates where stick shaker activates below 20000ft, or where stick shaker or low speed buffet occurs (whichever is higher) above 20000ft.
What 3 things affect the maximum speed red brick limit?
2. Landing gear placard speed
3. Flap placard speed
What is maximum manouvering speed and how shown?
Amber bar below maximum speed red bricks and provides 1.3g manoeuvre capability to high speed buffet.
What length of time does the speed trend vector predict?
When in TRU for heading reference when does the box around TRU on HSI turn amber?
In descents of more than 2000ft at greater than 800fpm
What does the position trend indicator predict on the HSI (lubber line above position triangle)?
Predicted position for next 30, 60, and 90 second intervals
What deviation does the scale show on the vertical deviation indicator on the bottom right of the HSI?
What do the energy management circles on HSI mean? Colours?
Indicates clean (Cyan) and speed-brake (White) energy management circles as defined in OFFPATH DES page
How far out does the dahs runway extended centreline appear on the HSI?
What does the FLT DIR source selector switch do?
Selects either the L, C, or R flight control computer for the applicable F/Ds
What does the NAV source selector choose between?
What systems does it feed into to?
Either L or R FMC or CDU L (for alternate navigations system operation)
Feeds into the applicable SGs and FCCs (Left and Centre from Captains source selector switch and Right from co-pilots)
What does the EFI switch determine?
Captains source primary and alternate (ALTN)?
Co-pilots source primary and alternate (ALTN)?
What sources for the EFIS SG, ILS receiver, and radio altimeter to display on the applicable HSI
Captains = Left primary, centre ALTN
Co-pilots = Right primary, centre ALTN
What does INSTR SWITCH message on EICAS mean? (2)
If both pilots select an ALTN instrument source selector. Both operating of centre systems and ADI/HSI displays both controlled by the Captains EFIS control panel
What does the IRS source select switch determine? (3)
1. Source for SG
2. Source for VSI
3. Source for RDMI
What does the AIR DATA switch select between and for what systems?
Selects between left and right air data computer for the applicable ASI, speed tape, primary and metric altimeters, and VSI (via selected IRS)
What does the Decision Height reset switch do on the EFIS control panel?
Resets DH alert on related ADI
Where do the RDMIs receive primary and alternate heading signals from?
Primary = opposite side IRS
ALTN = centre IRS
What two sources to the VSIs get info from?
IRS and ADC
What powers the standby ADI in the event of losing all generator power?
Standby DC bus
Which ILS used for standby ADI?
What pitot system does the standby ASI use?
R AUX pitot and the alternate static system
What pitot system does the standby altimeter use?
Alternate static system
What does the Air Data system comprise of? (4)
1. Pitot-static system
2. One TAT probe
3. two ADCs
4. Two AoA probes
What does TAT comprise of and what does it indicate on the ground?
OAT plus ram rise and will indicate approximate OAT on the ground
What latitude north and south does auto switching occur between mag and tru?
What does ADC provide pitot/static information to? (9)
What do IRUs calculate? (6)
Wind Direction and speed
How long o IRUs generally take to align?
If IRUs accidentally moved to ATT rather than ALIGN during alignment what do you need to do?
Move back to off for 30sec then to ALIGN
Why do ON DC lights come on when IRUs are aligning?
Testing the back up DC power system (short power test)
If both FMCs fail how doe IRUs get mag variation detail?
They store identical variation tables internally
What two things do after turning IRUs to off during shutdown?
1. Make sure IRU Lat/Long display goes blank
2. ALIGN lights come on but go off after 30 sec
What two things could flashing IRS ALIGN lights mean? And what should you follow?
Either align position not entered or disagree with IRS position vs origin
Get out the supplementary procedures to fix
What does DC FAL light mean on IRS?
Back up DC power not avail, but if still have AC power then all ok
If all three IRUs indicate ON DC (no AC power avail), what happens after 5 min?
Right IRU shuts down to conserve battery power
If a left or right IRU has a fault, what can you do to regain respective side?
Switch IRU Inst Switch to ALTN to use centre IRU
When aligning in ATT airborne how long do you need to fly straight and level for during alignment?
When doing an airborne alignment in ATT mode what must you enter into FMC?
Heading on the POS INIT page
What does ATT mode give on IRUs?
Attitude and HDG (after entering heading into CDU POS INIT page)
On the radio page on the CDU what do the following letters mean next to the VOR Frequency? A, R, P, M
A = Automatic (FMC)
R = Remote, by the crew through FMC
P = Procedure (it is needed by a procedure selected in FMC)
M = Manual (manual selection of frequency on MCP
On HSI in MAP at what point on the aircraft triangle is the aircraft actually located?
At the top
When does VNAV Path deviation indicator disappear? (2)
1. After passing E/D point
2. G/S engages
What two inputs does the green altitude arc take inout from when calculating when it will reach MCP altitude?
Current groundspeed and current vertical speed
What happens with autothrottle when in throttle hold?
Power is taken away from autothrottle so throttles stay where they are
When does CLB thrust occur after take off? (3)
Difference between disengaging the autothrottle by using the A/T Arm switch or the switch on the throttles?
The one on throttles leaves the A/T armed and is available for speed protection
How do you delete all altitude descent restrictions at once on legs page between current altitude and ATC cleared (MCP) altitude?
Use DES DIR option on VNAV descent page
If in speed intervention (VNAV SPD) during VNAV descent what must you do once back on path to get back into VNAV PTH?
Must close speed window
If No LAND 3 is shown but all 3 autopilots are engaged what could be causing it and how find out?
Could be centre radalt or ILS and can look by EFI switching to centre SG
If the ASA has a fault (indicating either NO LAND 3 or NO AUTOLAND) and you think you have fixed it how can you clear it?
Hit the rest button on the ASA or it may do it automatically through 1500ft when it does its self test
What is the power source for standby AI?
28V Standby DC Bus