Ch.11 (Flight Management/ Navigation) Flashcards
Flight Management/ Navigation
How/when does the FMC receive DME updating?
Only when manually selected on the FMC NAV OPTIONS page
When the tuned frequency (no decoded name) remains visible on the PFD or ND or shows an incorrect identifier, how do you verify the station identity?
Through the audible morse code identifier
What does a flashing ALIGN light (white) on the IRS panel during preflight indicate?
Unable to align due to: No position, Unreasonable position entry or a significant difference between previous position and entered position
What does the FAULT light (amber) on the IRS mode selector unit indicate?
A detected fault affecting the related IRS ATT and or NAV modes
What does the ON DC light (amber) illuminated in flight indicate?
If the related IRS is operating on DC power through the Switched Hot battery bus (AC power not normal)
What does a single DC FAIL light (amber) illuminated in flight indicate?
DC power for the related IRS is not normal
What will happen if both ON DC lights (amber) illuminate?
Power to the right IRS is terminated if AC power is not restored within 5 minutes
IRS ground alignment at high latitudes may take how long?
May take up to 17 minutes
When does IRS position and ground speed information become available?
Not until the IRS is aligned on the ground
What does a GPS light (amber), illuminating during master caution recall and extinguishing when the master caution system is reset indicate?
Failure of a single GPS sensor
With the FMC source select switch set to NORMAL, how are the FMCs controlling the CDUs and providing input to the autothrottle?
Left FMC is primary and controls the CDUs and provides input to the autothrottle. The right FMC operates in synchronization with the left FMC.
How does moving the FMC source select switch to BOTH ON L or R affect LNAV and VNAV?
LNAV and VNAV will disengage
What does an illuminated MCDU EXEC light indicate?
Active MCDU data has been modified but not executed
What signifies mandatory data inputs on the MCDU?
Boxes signify mandatory data
When is INSUFFICIENT FUEL on the CDU displayed?
When predicted fuel at destination will be 2000lbs or less
What are the indications of a right FMC failure?
- FMC alert light and FMC message light will illuminate
- SINGLE FMC OPERATION displayed in both scratch pads
- VTK will display on right navigation display
What are the indications of a left FMC failure?
- FMC alert light and FMC message light will illuminate
- SINGLE FMC OPERATION displayed in both scratch pads
- VTK will display on left navigation display
What are the indications of a dual FMC failure?
- FMC alert light and FMC message light will illuminate
- SINGLE FMC OPERATION displayed in both scratch pads
- VTK will display on both navigation displays
Define actual navigation performance (ANP) and required navigation performance (RNP)
- ANP: the FMC’s estimate of the quality of its position determination
- RNP: The navigation performance required during each phase of flight or during
certain approaches
When does LNAV engage, regardless of heading?
When laterally within 3nm of the active route leg
The descent path starts at the calculated top of descent (T/D) point and includes waypoint altitude restrictions. The path is based on what parameters?
- Idle thrust with speed brakes retracted
- Descent windspeed decreasing with decreasing altitude unless forecast winds have been entered into FMC
- Applicable target speed
When does VNAV PTH descent automatically revert to VNAV SPD?
When the following conditions exist:
- Limit speed Reversion
- Path Diversion
- No “TO” waypoint
AT28R, BT28R, and CT28R are waypoints from what type of FMC procedure?
Engine out side
When will BYPASS appear between two waypoints on the legs page?
When waypoints are too close and it is impossible for the aircraft to make the turn to capture a leg between two waypoints
