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- The FCU-selected altitude is set at the altitude constraint while ALT CSTR* or ALT CSTR
   (ALT* or ALT magenta <~) mode is engaged.
- The aircraft transitions to DES or APPR phase.
- Arming requirements are no longer met.
- Vertical flight path validity is lost, or NAV mode is lost while ALT CSTR* or ALT CSTR
   (ALT* or ALT magenta <~]) mode is engaged.
ENGAGEMENT CONDITIONS
The CLB mode can be engaged, if the following conditions are all met :
- The aircraft has been in flight for more than 5 seconds.
- The selected FCU level is above the present aircraft level.
- The descent, approach, or go-around phase is not active.
- NAV mode is engaged.
- Glideslope (G/S) mode is not engaged.
CLB mode automatically engages when the aircraft reaches ACC ALT, or sequences a
waypoint with an altitude constraint while the CLB mode is armed.
CLB mode manually engages when the pilot pushes in the ALT select knob, with the CLB
mode not armed and the current altitude is not an effective altitude constraint of the flight
plan.
Note : When CLB mode is engaged :
        - The V/S (FPA) window of the FCU shows dashes.
        - The managed LVL/CH dot on the FCU lights up.
        - The Flight Mode Annunciator displays "CLB" in Column 2
DISENGAGEMENT CONDITIONS
The CLB mode disengages, if one of the following conditions is met :
- NAV mode is lost or disengaged (OP CLB engages).
- Another vertical mode engages.
- The pilot selects an altitude on the FCU that is lower than the present aircraft altitude
   V/S (FPA) engages on the current V/S (FPA).
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━┓
┃I  -~ A318                      ┃  AUTO FLIGHT   ┃1.22.30     P 23  ┃
┃  .-,,.8, ,, ~e~ A319           ┃                ┃                  ┃
┃ Lli,~ A320                     ┃                ┃                  ┃
┃                                ┃                ┣━━━━┳━━━━┫
┃      A~7-~'M" A321             ┃FLIGHT GUIDANCE ┃SEQ 001 ┃REV 25  ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃        ┃        ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━┻━━━━┻━━━━┛
OPEN CLIMB MODE (0P CLB)
The OPEN CLIMB mode is a selected mode. It
SPD/MACH (selected or managed), while the
climb thrust.
ENGAGEMENT CONDITIONS
uses the AP/FD pitch mode to maintain a
autothrust, if active, maintains maximum
The OPEN CLB mode can be engaged only if the following conditions are met :
- The aircraft has been in flight for more than five seconds.
- The LAND mode is not engaged.
- The FCU-selected altitude is higher than the aircraft present altitude.
The OPEN CLB mode is engaged by one of the following :
- The pilot pulls out the ALT selector knob.
- The aircraft reaches acceleration altitude with CLB mode armed and NAV mode not
   engaged.
- The pilot pulls out the SPD/MACH selection knob if TOGA mode or EXPED CLB <~ is
   engaged.
Guidance reverts to ensure speed protection. (Refer to 1.22.30 reversions)
The NAV mode is lost (or disengaged) when previously in CLB mode.
When OPEN CLB is engaged : "OP CLB" is displayed on the FMA and the managed LVL/CH
dot on the FCU goes out.
DISENGAGEMENT CONDITIONS
The OPEN CLB is disengaged by any one of the following :
- Engagement of any other vertical mode
- Reversion to V/S mode (Refer to 1.22.30 reversions)
- Selection of an altitude lower than the aircraft present altitude (V/S FPA engages on
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(37)