Automatic Flight Control System Flashcards
AFCS stands for?
Automatic flight control system
AFCS provides integration of?
AUTOPILOT and FD SYSTEMS
AFCS ststem consists of?
2 FCC
AUTOPILOT
2 YAW DAMPERS
AUTO ELEVATOR TRIM CONTROL and assorted servis and actuators
Integration of avionics system?
IAPS ..integrated avionics processing system
Located in avionics compartment
Where are the FCCs located?
Mounted inside the IAPS
IAPS
FCC1…………. …………..FCC2
FDs are turned on by?
Selecting a vertical mode
Lateral mode
Engaging autopilot
Sync msg remains on for
3sec
FMA?
ACTIVE. STDBY
LATERAL. LATERAL
…………… …………..
VERTICAL. VERTICAL
Lateral takeoff mode?
Hdg hold within 5 degrees bank
( usung hdg existing at TO)
Annunciated by green TO FMA
Roll mode?
5° or less bank angle?
Holds the heading when mode was initiated
Greater than 5° Bank angle?
Holds current bank angle
Onside loc capture cancels?
Turb mode
Lateral G/A mode?
Heading hold with 5degree bank angle
Pitch mode?
Set to current pitch angle
Each click of vs pitch wheel?
1/2 degree
Pitch mode is automatically selected when
No other vertical mode is active and the flight director is on
How is vertical takeoff mode selected?
By toga switches on the ground
Go around mode
8 degree pitch up command
The autopilot can be disengaged manually by
- AP/SP DISC switch on the control wheels
- AP ENG switch on FCP
- AP DISC bar on FCP
- eithee stab trim on control whl
- TOGA
- YAW DAMP DISC
AutoPilot automatically disengages when
- failure of both yaw dampers
- failure detected by FCC circuits
- stick
- unusual attitude
- two seconds after a windshear warning
How many AHRS IRS reqd for AP?
Both
Vert takeoff mode?
Variable
However! 10 degrees when SE
Turb mode cleared?
Re appch mode
Onside loc capture
Needed to engage autopilot?
Both fcc's 1 stab 1 yaw 1 ADC 2 IRS AHRS - no instability of aircraft
Disengage ap manually
- either AP/SP DISC switch
- AP ENG on FCP
- AP DISC BAR on FCP
- stab switches
- TOGA
- YD DISC
AP disengage auto?
- both yaw dampers fail
- failure detected by FCC
- stall warning
- windshear
In most flight modes How many FD’s are active ?
1
When are both FD’s active?
TO/TO
GA/GA
APPR
FCC status indicator light ?
Illuminates to indicate that the respective FCC has it knowledged the selection
How many lateral modes?
8
TO GA APPR NAV BROLL HDG 1/2 bank
APPR clears?
TURB and 1/2 bank
When using a Backcourse approach, what course should be selected?
The front course
Overspeed protection in VS or pitch mode??
Over speed clacker
Reverts to IAS/mach
Speed bug pitches up to VMO -5 knOTS (Aircraft slows while capturing the airspeed)
Overspeed protection and warning in ALTS MODE?
ClAcker
Regarding configuration warnings
The warning system is armed for take off when the thrust is advanced abov
70 percent
When the auto pilot is manually disengage the warning sounds for how long
Approximately two seconds
Overspeed protection warning?
If in VS or pitch mode
An overspeed condition occurs
Overspeed Clacker sounds
Reverts to IAS/MACH mode
Speed bug Will sync to the Vmo-5
Aircraft slowly pitches to speed
4-32 systems
Go around mode generates a pitch up command of?
8°
4-30
At what altitude does indicated airspeed change to machautomatically
31600
To engage the auto Pilot the following is required
Both FCCs
One yaw
One stab
One ADC
BOTH AHRS IRS
No significant instability of the aircraft
How many vertical modes
10 vertical modes
Lateral takeoff mode is selected by?
Pushing one of the TOGA switches while on the ground
Annunciated with a green TO Message in the lateral capture field on the PFD
Fuel required to get to destination is found where or on what page in the FMS?
Perf page 3
