Enter the desired step climb altitude on the STEP line. If known, enter the estimated average true wind direction/speed for the desired step climb altitude on the ACTUAL WIND line.
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Supplementary Procedures -Flight Management, Navigation
737 Flight Crew Operations Manual
Step climb savings................................................................... Determine Observe the fuel SAVINGS/PENALTY and FUEL AT ______ (destination) lines to determine if a higher cruise altitude is advantageous.
If step climb fuel savings are significant, use the appropriate climb procedure to initiate climb to the higher altitude when NOW is displayed on STEP POINT line.
Note: Step climb evaluations do not consider buffet margin limits. If the altitude entered for the step climb evaluation is higher than the maximum altitude for flight with an adequate buffet margin, the message “MAX ALT FLXXX” will be displayed in the scratch pad. Ensure the new cruise altitude entered for the climb is at or below the MAX ALT displayed in the message in order to maintain a safe buffet margin.
Entering Descent Forecasts
DES page........................................................................................ Select Observe FORECAST prompt displayed.
DES FORECASTS page ................................................................ Select
Verify the TRANS LVL and revise if required. Enter average ISA DEV forecast for descent and destination QNH. Enter forecast descent WINDs (for up to three different altitudes).
EXEC key ........................................................................................ Push Observe MOD DES FORECASTS page changes to ACT.
Engine Out
Engine out climb and cruise pages provide advisory information for engine out operation. Refer to section 11.41 and 11.42 for a complete description of ENG OUT CLB and ENG OUT CRZ pages.
Required Time of Arrival (RTA)
Note: An active FMC flight plan complete with all performance data must exist before the required time of arrival (RTA) mode can be used.
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Supplementary Procedures -Flight Management, Navigation 737 Flight Crew Operations Manual
Entering an RTA Waypoint and Time
RTA PROGRESS page ...................................................................Select
On PROGRESS page 2, line 1L, enter the flight plan waypoint where required time of arrival is applicable. Observe the MOD RTA PROGRESS page displayed with the computed ETA, for the entered waypoint, displayed in line 1R.
RTA .................................................................................................. Enter
Enter required time of arrival into line 1R. Time should be entered in hours, minutes, and seconds (Examples: 174530, 1745, 1745.5). Observe MOD RTA PROGRESS page displayed with pertinent data for complying with entered RTA. Observe EXEC key illuminated.
EXEC key .........................................................................................Push Observe ACT RTA PROGRESS page displayed.
Entering Speed Restrictions for RTA Navigation
PERF LIMITS page........................................................................Select
Enter minimum or maximum speed restriction for RTA navigation in lines 2, 3, or 4 depending on phase of flight. Observe RTA parameters change to reflect new limits (RTA PROGRESS page) and EXEC key illuminated.
EXEC key .........................................................................................Push Observe MOD PERF LIMITS page change to ACT PERF LIMITS page.
Note: Entered restrictions on line 2, 3, and 4 also restrict other
navigation modes such as ECON.
Entering New Time Error Tolerances for RTA Navigation
PERF LIMITS page........................................................................Select
Enter desired time error tolerance (5 to 30 seconds) for the RTA waypoint on line 1L (Example: 25). Observe MOD PERF LIMITS page displayed and EXEC key illuminated.
EXEC key .........................................................................................Push Observe ACT PERF LIMITS page displayed.
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Supplementary Procedures -Flight Management, Navigation 737 Flight Crew Operations Manual
Additional CDU Functions
Navigation Display Plan Mode (Center Step Operation)
EFIS Control Panel Mode Selector ................................................PLAN
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