Autoflight & FMS Flashcards
LNAV engagement criteria
- active route entered in FMC
- within 3nm of active route LNAV engages with any aircraft heading
- outside of 3nm airplane must be: on intercept course 90 degrees or less and intercepting route segment before active waypoint
APP mode can be disconnected by
- pushing a TOGA switch
- disengaging AP and turning off both FD switches
- retuning the VHF nav reciever
Thrust Mode Display annunciations
TO TO-R CLB CLB-R CRZ G/A CON
4 FMA annunciations
AT mode
Pitch mode
Roll mode
A/P status
FMA A/T modes?
N1 GA RETARD FMC SPEED MCP SPEED IAS/MACH THR HOLD ARM
FMA Pitch modes?
TO/GA V/S ALT ACQ ALT HOLD VNAV SPD VNAV PTH MCP SPD G/S FLARE
FMA Roll modes
HDG SEL
LNAV
VOR/LOC
FMA A/P Status
CMD
FD
CWS P
CWS R
A/P Disengagement criteria
.
Auto Flight takeoff pushing TOGA button
Both FDs must be on prior to starting the takeoff.
Pushing TO/GA button during takeoff
- pitch command is 10 deg. nose down (TO/GA FMA)
- roll command is HDG SEL
- A/T is engaged in N1 mode
- thrust levers advance to TO thrust
Auto Flight takeoff roll through V1
60 kts F/D commands 15 deg nose up
84 kts A/T mode annunciates THR HLD
FMS system includes
FMSC AFDS AT IRS GPS
Inertial system
Computes airplane position, ground speed, attitude for instruments, FMS, autoflight and other systems
IRS
2 independent IRSs, each has 3 laser gyros and accelerometers, IRS are sole sourse of attitude and heading except for STBY ATT indicator & MAG compass
Phases of the FMS
preflight, takeoff, climb, cruise, descent, approach, completed flight
