Autoflight General DSC 22-10 Flashcards
The FMGC is divided into 2 main parts.
The Flight Management (FM) part controls….?
- Navigation and management of navigation radios
- Management of flight planning
- Prediction and Optimisation of Performance
- Display Management
The FMGC is divided into 2 main parts.
The Flight Guidance (FG) part performs….?
- Autopilot command
- Flight Director command
- Autothrust command
How long does an FMGC database update take to complete
20mins, or
5mins if cross loaded from the opposite FMGC
The FAC controls….?
Rudder
Rudder Trim, and
Yaw Damper inputs
The FAC computes data for…..?
Flight Envelope, and
Speed functions
The FAC provides warning for…..?
Low Energy, and
Windshear detection
The Thrust Levers….?
- Arm the autothrust at takeoff when FLX or TOGA selected
- Limit the max thrust by their position when autothrust is active
- Disconnect ATS when thrust levers IDLE
- Command thrust manually when ATS not active
- Engage common modes when TOGA (FLX) is set
- Set ATS active when thrust levers between IDLE and CL (MCT in engine out)
If one AP is engaged, which FMGC is master?
The related FMGC is master.
- It uses the onside FD for guidance
- It controls the A/THR
- It controls the FMA 1 + 2
If two AP’s are engaged, which FMGC is master?
FMGC 1 is master
If no AP is engaged and FD1 pb is ON, which FMGC is master?
FMGC 1 is master
If no AP is engaged and FD1 pb is OFF and FD 2 pb is ON, which FMGC is master?
FMGC 2 is master
If no AP is engaged, A/THR is controlled by…?
FMGC 1
What abnormal condition would cause an INDEPENDENT OPERATION message on both MCDU scratchpads?
- Different database validity on both FMGC’s
- 5 (3 YUD) resynchronisations in 5mins
Amber IND annunciator at top of MCDU keyboard
WHen is single FMGC mode automatically selected?
when 1 FMGC fails
What are the indications of a single FMGC failure?
On MCDU:
“OPP FMGC IN PROCESS” in scratchpad
FM1/2 amber annunciator
On ND
“MAP NOT AVAIL”, “SET OFFSIDE RNG/MODE”
or
“OFFSIDE FM CONTROL if rng/mode same
When convenient reset failed FMGC
Is there a reset for a failed FMGC?
Yes.
FCOM 22 20-90-10 FMGC RESET
QRH ABN RESET AUTO FLT FMGC
For how many seconds does the following display the selected value in the FCU window:
a) SPD/MACH?
b) HDG/TRK?
c) VS?
a) SPD/MACH -10 secs
b) HDG/TRK -45 secs
c) VS -45 secs
The characteristic speeds displayed by the PFD are computed by the…..?
FAC’s
All operating speeds are referenced to which speed?
VS1g
V2 =
1.13 VS1g
VREF =
1.23 VS1g of Conf FULL
VLS is computed by the…?
FAC’s
VLS =
a) during take-off?
b) after retraction of 1 step of flaps
c) clean config
a) during take-off -1.13 VS1g
b) after retraction of 1 step of flaps -1.23 VS1g
c) clean config -1.28 VS1g
FCOM also refers to VS1g as….?
VS
Above 20000ft, VLS is corrected for Mach effect to maintain a buffet margin of…?
0.2g
What effect does extending speedbrake have on VLS?
VLS increases
Green Dot Speed is….?
Best Lift Drag Ratio
Engine Out operating speed Clean Config
Final Take-off speed
How do you calculate Green Dot speed:
a) Below 20000ft?
b) Above 20000ft?
a) Below 20000ft
2 x GW plus 80kts
b) Above 20000ft
add 1kt per 1000ft
What calculates VaPROT, VaMAX and VSW?
The FAC
VaPROT, VaMAX and VSW as computed by the FAC are used for….?
Display on the PFD
NOT for flight Control Protection
Activation of flight control protections is computed by the…?
ELAC
VMAX is determined by…?
The FAC
VAPP is calculated by the….?
FMGC’s
VAPP =
VLS + wind correction
Wind correction is limited to …?
Min 5 kts
Max 15 kts
During Autoland, or
When A/THR is ON, or
in case of ice accretion, or
gusty crosswind >20kts
VAPP must not be lower than…?
VLS +5 kts
