No ZFW on MCDU
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No ZFW on MCDU
I can no longer find the consequences of neglecting insertion of performance data on the MCDU for departure as it used to be on FCOM 4.
if i can get some help with that. thank you.
if i can get some help with that. thank you.
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PRO-NOR-SRP-01-10 P 25/32
TAKEOFF WITH NO WEIGHT/CG DATA
If the crew does not enter ZFW/ZFWCG data prior takeoff, or if the FMGC looses these values due
to a power interruption, the following will occur:
‐ At takeoff, the Speed Reference System (SRS) mode is available (provided a V2 has been
inserted)
‐ When the aircraft leaves the SRS mode, the target speed becomes the current speed and
reverts to selected.
Note: If the AP/FD has reverted to ALT or V/S (FPA) mode, the associated A/THR mode is
SPEED. In this case, the system will probably reduce thrust, because the speed will be
equal to, or greater than, the target speed.
TAKEOFF WITH NO WEIGHT/CG DATA
If the crew does not enter ZFW/ZFWCG data prior takeoff, or if the FMGC looses these values due
to a power interruption, the following will occur:
‐ At takeoff, the Speed Reference System (SRS) mode is available (provided a V2 has been
inserted)
‐ When the aircraft leaves the SRS mode, the target speed becomes the current speed and
reverts to selected.
Note: If the AP/FD has reverted to ALT or V/S (FPA) mode, the associated A/THR mode is
SPEED. In this case, the system will probably reduce thrust, because the speed will be
equal to, or greater than, the target speed.
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Hello MD83FO
Here´s wht you find in the AI FCTM :
ERRONEOUS ZFWCG ENTERED
The CG computed by the FCMC is erroneous. This induces the following
consequences:
· Incorrect CG is displayed on ECAM SD and on MCDU FUEL PRED page
· CG regulation is affected but “EXCESS AFT CG” warning remains
reliable.
· Minor impact on FM predictions.
· Additionally, VLS and Vapp speeds on MCDU PERF APPR page are
impacted (A340-500/600 only).
· At take-off, the pitch trim setting might be erroneous. This is minor since
take-off has been certified in full forward CG with full aft trim and vice
versa.
· In flight, the PRIM operate with CG=30% which has minor consequence
on the aircraft handling
· AP/FD control laws are slightly affected
· VLS displayed on PFD is impacted (A340-500/600 only)
Vaprot, Vamax, Vsw are not affected since based on aerodynamic data.
Regards
ERRONEOUS ZFW ENTERED
GW and, to a lesser degree, CG computed by FCMC are erroneous. This induces
the following consequences:
· Incorrect GW and CG displayed on ECAM and on MCDU FUEL PRED
page
· CG regulation is slightly affected since the aft target CG depends on the
weight but “EXCESS AFT CG” warning remains reliable.
· The SRS mode guidance may be affected (If VLS > V2 inserted on
MCDU PERF TO page).
· FM predictions and speeds are affected
· The FG and PRIM control laws are slightly affected
· The characteristic speeds displayed on PFD are affected.
Vaprot, Vamax, Vsw are not affected since based on aerodynamic data.
Here´s wht you find in the AI FCTM :
ERRONEOUS ZFWCG ENTERED
The CG computed by the FCMC is erroneous. This induces the following
consequences:
· Incorrect CG is displayed on ECAM SD and on MCDU FUEL PRED page
· CG regulation is affected but “EXCESS AFT CG” warning remains
reliable.
· Minor impact on FM predictions.
· Additionally, VLS and Vapp speeds on MCDU PERF APPR page are
impacted (A340-500/600 only).
· At take-off, the pitch trim setting might be erroneous. This is minor since
take-off has been certified in full forward CG with full aft trim and vice
versa.
· In flight, the PRIM operate with CG=30% which has minor consequence
on the aircraft handling
· AP/FD control laws are slightly affected
· VLS displayed on PFD is impacted (A340-500/600 only)
Vaprot, Vamax, Vsw are not affected since based on aerodynamic data.
Regards
ERRONEOUS ZFW ENTERED
GW and, to a lesser degree, CG computed by FCMC are erroneous. This induces
the following consequences:
· Incorrect GW and CG displayed on ECAM and on MCDU FUEL PRED
page
· CG regulation is slightly affected since the aft target CG depends on the
weight but “EXCESS AFT CG” warning remains reliable.
· The SRS mode guidance may be affected (If VLS > V2 inserted on
MCDU PERF TO page).
· FM predictions and speeds are affected
· The FG and PRIM control laws are slightly affected
· The characteristic speeds displayed on PFD are affected.
Vaprot, Vamax, Vsw are not affected since based on aerodynamic data.