Flight Management System (FMS) Flashcards
How often is the navigation database updated
28 day cycle
How many waypoints and Nav aids may be inserted into the temporary data base
20 waypoints
20 Nav aids
Where is the route displayed
On the Flight plan and the ND map display
In what stage would a step climb be included
Cruise phase
When is PROF guidance terminated
FMS PROF guidance is terminated when an ILS glide slope is intercepted
When is NAV guidance terminated
NAV guidance is terminated when an ILS localizer is intercepted.and when there is a discontinuity
Range and bearing information normally comes from what type of Nav aid
VOR/ DME
How are the Nav aids classified
The class of a navaid is defined as VOR, DME, VOR/DME, VORTAC, or LOC
With 2 IRU’ S fitted , how do the FMC’c calculate position? And if one fails
Each FMC independently computes the IRS position as a weighted average of all three Inertial Reference Units (IRU’s). When only two valid IRU’s are available (with three IRU’s installed), each FMC will use one valid IRU for its independent calculation of the aircraft’s position. With two IRU’s installed, a simple average of the IRU positions are used. If, at any time, latitude or longitude data from one IRU differs from the previous average by one-half degree or more, that IRU will not be used in the averaging process until the output of that IRU is within one-half degree of the previous average
What are the strategic speed target’s
ECON, MIN FUEL, MIN TIME
What are the tactical speed targets
MAX CLIMB, MAX END, MAX DES, pilot enter speeds
What does the predicted descent take into account
The synthesis starts at the destination to compute the paint where flaps are expected to be extended and then integrates in the reverse direction to intersect the cruise altitude creating a top of descent (T/D) point. This results In a predicted path that takes into account economy descent speed targets, waypoint altitude constraints, speed limits, and the impact of wind forecasts.
Before Eng start what fuel/ Weight figures should be entered
BLOCK Fuel On Board (FOB), Zero Fuel Weight (ZFW), or Take-Off Gross Weight (TOGW)
What message would you expect to see if atmospheric conditions on descent cause a significant increase in speed
If atmospheric conditions causes a significant increase in speed the pilot will be prompted by the CDU to deploy speed brakes. Conversely, the throttles are automatically advanced if speed falls below the target speed by 20 knots
On descent what happens if the speed falls below 20 kts of target speed
the throttles are automatically advanced if speed falls below the target speed by 20 knots.
