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FMC Progress, Fix and Ref Nav Data

 
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K.Haroon
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Joined: 11 Dec 2005
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PostPosted: Wed Aug 15, 2012 9:42 am    Post subject: FMC Progress, Fix and Ref Nav Data Reply with quote

Arrow Progress Pages

Progress Page 1



Destination (DEST)

Any waypoint or airport in navigation database can be entered. The line titles are:

• DEST – performance predictions to destination. Default display

• DIR TO FIX – when entered waypoint is not in flight plan. Data is based on flying present position direct to the waypoint

• EN ROUTE WPT – when entered waypoint is in flight plan. Line data are based on flying the flight plan route to the waypoint

• MOD – a modification has been made on another page. Performance predictions include modification.

Remove entries with DELETE key or change all CDUs to a different page.


Line 4R

Line titles can be:

• T/C - top of climb

• STEP CLB – step climb data

• T/D – top of descent data

• E/D – end of descent data

• LEVEL AT – time and distance to level off in Drift Down mode.

Line Data can be:

• ETA and DTG to line title point.

• NOW: If airplane is past the climb/descent point when STEP CLB or T/D displays in the line title.

• NONE: If line title is STEP CLB and the step has not been entered on the CRZ page or the FMC calculates a step climb is not advised.


Progress Page 2



Fuel Quantity TOTALIZER, CALCULATED

TOTALIZER: It is the totalizer system fuel quantity. It is blank if the fuel quantity is manually entered on the PERF INIT page; the manually entered quantity displays under CALCULATED and the fuel quantity indicating system is not used until flight completion.

CALCULATED: It displays the FMC calculated fuel quantity remaining, when no manual fuel quantity entry is made on the PERF INIT page.

Before engine start, the CALCULATED value is set equal to the TOTALIZER. The displayed totalizer quantity can be between 99% and 101% of the actual fuel. After engine start, the CALCULATED fuel quantity is decreased by the fuel flow sensing system (FUEL USED). Sensed fuel flow tolerances may allow up to 40 kgs per hour CALCULATED fuel quantity variation. After fuel jettison or after all engines are shut down, CALCULATED resets to the totalizer system fuel quantity.


USE

Selects method to calculate fuel quantity, either TOTALIZER or CALCULATED.

When one is selected:

• it is used for remainder of flight

• the other fuel calculation method blanks

• scratchpad clears.


Progress Page 3



Required Time Of Arrival (RTA)

Suffix to RTA indicates:

• no suffix – arrive at entered time

• A – arrive at or after entered time

• B – arrive at or before entered time.

Entry before takeoff causes recommended T/O time to meet RTA at ECON speed on Line 3R. "NOW" is displayed after recommended takeoff time.

Manual entry at 3R recalculates all flight plan time predictions.


PRIOR RTA

• displays previous RTA fix and time

• initiates RTA flight plan modification.


Cruise Speed Segment

Displays cruise speed segment start and end waypoints.

A speed for a cruise segment can be specified (on the route LEGS page). The airplane maintains a constant speed between the two waypoints.

A cruise segment has a start waypoint and an end waypoint.

For the Start Waypoint, entry is in Mach.

For the End Waypoint, entry can be a Mach number, ECON/ or E/, LRC/ or L/.

If an RTA waypoint is inthe flight plan, RTA/ or R/ may be entered.


Progress Page 4



Lateral RNP (Approach): Displays lowest applicable RNP for the approach. Entry not allowed at 6L.


===============================================
Arrow Fix Information Page
===============================================



Bearing/Distance (BRG/DIS), ETA, DTG, ALT

Distances from the fix display on the ND as a circle around the fix. When the circle intersects the active route, the ETA, DTG, and predicted altitude at the intersection display for the closest of the two intersections.

Bearings from the fix display on the ND as radial lines from the fix. When the bearing intersects the active route, the ETA, DTG, and predicted altitude at the intersection display.

Push - copies the fix place/bearing/distance into the scratchpad. This fix can be placed in the route on a LEGS or RTE page as a waypoint.


Bearing/Distance (BRG/DIS) – Dashes

Enter a bearing, distance, or both bearing and distance from the fix. A bearing and distance from the fix displays on the ND as a waypoint fix point. ETA, DTG, and predicted altitude do not display.


Predicted Distance to ETA or Altitude (PRED ETA-ALT)

Valid entry is altitude, flight level, or time. Time entry must be followed by “Z”.

Entering an altitude or flight level displays the predicted along track distance and altitude or flight level on this line. The predicted airplane position displays on the ND route line as a green circle with the entered altitude/flight level.

Entering a time displays the predicted along track distance and the time. The predicted airplane position displays on the ND route line as a green circle with the entered ETA.


===============================================
Arrow Reference Navigation Data Page
===============================================



IDENT

Any waypoint, navaid, airport, or runway from the navigation database.


RAD NAV INHIBIT

ON (in large green font):

It means RAD NAV INHIBIT is ON i.e. All radio updating (DME/DME,VOR/DME,LOC) is inhibited. This is the default state.

When GPS is operable, radio updating is available, but is not used by the FMC for position updating.


OFF (in large green font):

It means RAD NAV INHIBIT is OFF i.e. All radio updating is available to the FMC.


VOR (in large green font):

It means RAD NAV INHIBIT applies to VOR/DME i.e. All VOR/DME updating inhibited. DME/DME updating is operable.


NAVAID INHIBIT

Valid entries are: VOR, VOR/DME, VORTAC, or DME identifiers from the navigation database.

Entries not allowed when RAD NAV INHIBIT displays ON (large green font)

Inhibits use of entered navaids for updating by both FMCs.


VOR ONLY INHIBIT

Valid entries are VOR identifiers from the navigation database.

Entries not allowed when RAD NAV INHIBIT displays ON or VOR (large green font)

Inhibits use of only VOR portion of entered navaid for updating by both FMCs. DME–DME position updating is not inhibited.
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