Climb
The climb page is selected by pushing the CDU VNAV function key while on the ground, during takeoff, or in climb.
The climb page is used to evaluate, monitor, and modify the climb path. The data on the climb page comes from preflight entries made on the route and performance pages, and from the FMC data bases. When the airplane reaches the top of climb, the FMC changes to the cruise mode, the cruise page is displayed and the climb page data is blanked. The FMC provides speed control in the climb mode to provided the best economy, a fixed speed, or the engine out speed. In each mode, the same type of data is shown on the page.
Page Title - ACT is displayed when the climb phase is active. The page title displays the type of climb:
• ECON - speed based on the cost index.
• LIM SPD - speed based on airplane configuration limiting speed.
• MCP SPD - MCP speed intervention selected.
• EO - engine out mode selected.
• ECON - speed based on the cost index.
• LIM SPD - speed based on airplane configuration limiting speed.
• MCP SPD - MCP speed intervention selected.
• EO - engine out mode selected.
CRZ ALT - Displays cruise altitude entered on PERF INIT page. Valid entries are: XXX, XXXX, XXXXX or FLXXX. Altitude displays in feet or flight level depending on transition altitude.
SPD - ECON SPD • economy speed based on cost index. • shows CAS and Mach values. SEL SPD • shows when intermediate level off required below an existing speed constraint. • shows when flight crew enters speed. • CAS or Mach value may be entered.
SPD TRANS - The speed transition line shows the transition speed/altitude from one of these sources: • the navigation database value for the origin airport. • a default speed of 250 knots and 10,000 feet. Not displayed above the transition altitude. Can be deleted.
SPD RESTR - Speed restrictions not associated with specific waypoints are manually entered on this line. Dashes before entry by flight crew. Valid entry is a CAS and altitude (example 240/8000).
ECON - Changes climb speed to ECON. Must be executed. Prompt is shown on line 5L when the climb mode is not ECON.
AT XXXXX - Displays next airspeed and/or altitude constraint at waypoint XXXXX. FMC commands the slower of constraint speed or performance speed. Constraints are entered on RTE LEGS page or are inserted as part of a SID. Delete here or on RTE LEGS page. Blank if no constraint exists.
ERROR - Displays altitude discrepancy and distance past waypoint where altitude will be reached. Blank if no error exists.
TRANS ALT - Transition altitude for origin airport contained in navigation database. FMC uses 18,000 feet if transition altitude is not available. Manually change transition altitude here or on DESCENT FORECAST page. Valid entries are XXX, XXXX, XXXXX, or FLXXX. Altitude information displayed on the CDU changes from altitudes to flight levels above the transition altitude.
MAX ANGLE - FMC calculated speed to provide maximum angle climb. Entry not allowed.
ENG OUT - Modifies page to show engine out (ENG OUT) performance data.
CLB DIR - Deletes all waypoint altitude constraints between the airplane altitude and the MCP altitude. FMC cruise altitude is not affected. Blank if no constraints exist.