Auto Flight Flashcards
What is the basic principle of autoflight systems ?
- Reversion
- Protection
- Managed and selected guidance mode
What are the component FMGS ?
Flight Management Guidance System
- 2 Flight management guidance computers (FMGC)
- 2 Multipurpose control and display units (MCDU)
- 1 Flight control unit (FCU)
- 2 Flight augmentation computers (FAC)
What is managed guidance ?
FMGS compute and guide a/c along prplanned route and vertical and speed profiles
What is selected guidance ?
FMGS guide a/c to the target value that is set on FCU
What are the functions of FAC ?
YAWL
- Yaw damping, rudder limiting, rudder trim
- Airspeed computation
- Windshear detection
- Low energy warning
What are the main interface btw FMGS, FADEC, and flight crew ?
Thrust levers
What are the main interface btw flight crew and FMGS ?
- FCU
- EFIS control pannel
- MCDU
- PFD, ND
How many mode does FMGS have ?
- Dual mode
- Independent mode
- Single mode
- Back-up navigation mode
FMGS mode
What is dual mode ?
Two FMGC are sychronized, one is the master, the other is slave. Each FMGC computes its own data and exhchange with each other. Some of the data in the slave FMGC come from the master. All data insert in any MCDU is transffered to both FMGCs.
FMGS mode
What is the master FMGC logic in dual mode ?
If one AP is engade, the related FMGC is master
If two AP is engaged, FMGC 1 is master
If no AP engaged:
* FD 1 on then FMGC 1 is master;
* FD 1 off, and FD 2 on FMGC 2 is master
If no AP/FD is engaged: A/THR is controlled by FMGC 1
FMGS mnode
What is independent mode ?
Both FMGC work independently and are linked only to their own side peripherals.
Each MCDU transmits its own side FMGC data
FMGS mode
What will not be displayed in MCDU in independent mode ?
On POS MONITOR page, FMGS position from opposite FMGC
On RAD NAV page, navaid tuned on the opposite MCDU
FMGS mode
When will FMGS select independent mode ?
Different database validity on both FMGS
FMGS mode
When do you have CROSSLOAD funtion in MCDU ?
Each FMGC has different database and a/c is on ground, and independent operation is detected
FMGS mode
What is the indication of independent mode ?
“INDEPENDENT OPERATION” displayed on both MCDU
FMGS mode
What is single mode ?
- One FMGC fails
- Both FDs are driven by operative FMGC
- Any entry on either MCDU is sent to the operative FMGC
FMGS mode
What are the indication of single mode ?
“OPP FMGC IN PROGESS” displayed on MCDU of failed FMGC
ND of failed FMGC display
* “MAP NOT AVAIL” and “SET OFFSIDE RNG/MODE” if NDS are not both in same mode or range
* “OFFSIDE FM CONTROL” if in same mode and range
POS MONITOR pages display same position (operative FMGC position)
FMGS mode
When do you select Back Up Navigation mode ?
Dual FMGCs failure
FMGS mode
How do you select Back Up Navigation mode ?
Via MCDU MENU page
FMGS mode
How does Back Up Navigation mode work ?
They recover the navigation function through MCDU and IRS/GPS
MCDU memorize active flight plan in its memory
MCDU annunciators (on the side of key board)
Display “FAIL” amber ?
MCDU has failed
MCDU annunciators (on the side of key board)
Display “MCDU MENU” white ?
Indicate flight crew should call up a peripheral linked to MCDU
such as ACARS, ATSU, or CFDS
MCDU annunciators (on the side of key board)
Display “FM” white ?
Come on when flight crew is using MCDU to display peripherals. This tell that FMGC has an important mess to deliver
Accesses the mess by press MCDU MENU
MCDU annunciators (on top of key board)
Display “FM 1/FM 2” amber ?
Onside FM is failed
MCDU annunciators (on top of key board)
Display “IND” amber ?
Onside FM detect an independent mode of operation while both FM are healthly
MCDU annunciators (on top of key board)
Display “RDY” green ?
MCDU passed its power up test after it was turned off using DIM key
MCDU
How many type of message are there in MCDU ?
2 type:
* Amber
* White
MCDU
What is amber message ?
Type 1: direct result of flight crew action. Displayed immediately ahead other mess
Type 2: inform flight crew of a given situation or request a specific action
FCU
How many channel does FCU has ?
FCU has 2 channel
One fails the other take control
FCU
What is the indication of managed guidance ?
FCU window display dashes and white dots light up
ALT window always display altitude selected by flight crew