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OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-50 P 13/14
FCOM 19 AUG 10
COST INDEX FOR LONG-RANGE CRUISE
The pilot can use the table on this page to find an approximate value for the cost index for
long-range cruise.
This unique cost index allows a specific ± 1 % around the specific range at long-range cruise
speed. This cost index is valid for CRZ FL = OPT ALT ± 10 000 ft.
AIRCRAFT ENGINE kg/min CI LRC 100 lbs/hr
CFM 5C4 50 67
A340-200/300 CFM 5C3 50 67
CFM 5C2 50 67
A340–500/600 RR 553/556 140 185
GE 1A2/1A3/1A4 40 53
A330 PW 4168/4164/4168A 30 40
RR 772/772B/772C/768 40 53
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
Intentionally left blank
A330/A340 FLEET PRO-NOR-SRP-01-50 P 14/14
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-60 P 1/12
FCOM 19 AUG 10
DESCENT
DESCENT INITIATION
Applicable to: ALL
The top of descent, displayed on the F-PLN page (T/D) and on the ND ( ), is a position that the
system calculates, assuming that the aircraft will begin its descent in DES mode with managed
speed, and that the system will guide the aircraft along the descent profile computed with all the
vertical F-PLN data (ALT CSTR, MANAGED MACH/SPD, SPD CSTR, SPD LIMIT) to reach VAPP at
1 000 ft AGL.
Note: • The ND does not display the top of descent when HDG (or TRACK) mode is engaged.
PROCEDURES
When the aircraft reaches the top of descent (T/D) :
SELECT the altitude target.
PUSH the ALT selector knob. DES mode engages.
CHECK the FMA annunciators.
DESCENT MONITORING
Applicable to:
DES MODE ENGAGED
When DES mode is engaged, NAV mode is engaged, and the system takes into account all
altitude and speed constraints.
The key parameter for monitoring the descent is the vertical deviation (VDEV) displayed on the
PFD and on the PROG page, which indicates whether the aircraft is on, above, or below the
descent profile.
PROCEDURE
SET the ATC cleared altitude on the FCU (considering also what is the safe altitude).
If the lowest safe altitude is higher than the ATC-cleared altitude, check with ATC that this
constraint applies.
If it is confirmed, SET the FCU altitude to the safe altitude until it is safe to go to the
ATC-cleared altitude.
MONITOR the vertical deviation (VDEV) on the PFD and the PROG page.
MONITOR the speed change that occurs when the aircraft reaches a speed change symbol
(magenta ball) under managed speed.
MONITOR the FMA (ALT*, ALT CST*, ALT, ALT CST) when the aircraft reaches level symbols.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-60 P 2/12
FCOM 19 AUG 10
If the aircraft is on the descent profile
The aircraft is considered to be on the vertical profile when it is within 50 ft of it. VDEV is
close to zero, and the system predicts that it will match constraints until the aircraft levels off
at the next FCU altitude.
MONITOR the predicted descent point after the next level-off.
The autothrust adjusts the thrust for the particular segment. The first FMA column may
display “THR IDLE” or “SPEED”.
If the aircraft is above the descent profile
VDEV is down on the PFD and positive on the PROG page.
The autothrust sets IDLE thrust and the AP increases speed by calling for down elevator. If
the aircraft reaches the upper limit of the managed speed range, the aircraft diverges and
maintains the upper limit speed.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-60 P 3/12
FCOM 19 AUG 10
Procedure
SELECT a descent speed higher than the upper limit when possible.
MONITOR the intercept symbol .
When this symbol reaches the next ALT CSTR waypoint “EXTEND SPD BRK” appears on
the PFD indicating that speedbrakes must be extended in order to match the next altitude
constraint. This is an advisory message.
Note: When DES mode is engaged, the speedbrake extension will not necessarily
increase the descent rate. It does so only if the aircraft is above the profile. If the
aircraft is on or below the profile : the system will add thrust to keep the aircraft on
profile and within the speed target range.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 10(2)
