A330/A340 Holding And Approach
REV 1 (6 JUN 05)
FCTM Instrument Approaches
Example of GS MINI
A330/A340 6.30.5 Instrument Approaches
FCTM REV 1 (6 JUN 05)
DECELERATION AND CONFIGURATION CHANGE
Managed speed is recommended for the final approach. Once the approach phase has been activated, the A/THR controls the speed to the minimum required for the current configuration. These speeds are:
.
Green Dot for Flaps 0
.
S speed for Flaps 1
.
F speed for Flaps 2 and 3 (if Flaps 3 is not selected as the LDG CONF)
.
VAPP for Flaps Full (or for Flaps 3 if selected as the LDG CONF)
To achieve a constant deceleration and minimise thrust variation, select the next configuration when reaching the target speed + 10 kt, e.g. when the speed reaches Green Dot + 10 kt, select Flaps 1. The IAS must be lower than VFE Next. Using this technique, the average deceleration rate will be approximately 10 kt/nm in level flight (20 kt/nm with speedbrake extended).
When below VFE CONF 1, the PF calls for "Flaps 1". The PNF visually confirms on the PFD that the speed is below VFE CONF 1, calls "Speed checks, Flaps 1" and then selects the flap lever to Flaps 1. He then monitors the E/WD to confirm that "1" is displayed in blue during transit and becomes green when the slats/flaps reach the correct position. This sequence should be repeated for subsequent flap settings.
If ATC requires a specific speed, select it on the FCU. When the speed control no longer applies, resume managed speed. If flying the intermediate approach in selected speed, activate the approach before resuming managed speed, otherwise the aircraft will accelerate to the previous descent speed.
In certain circumstances, e.g. tailwind or heavy weight, the deceleration rate may be insufficient. In this case, the landing gear may be lowered before selection of Flaps 2 and preferably below 220 kt to avoid undue stress to the gear doors.
Speedbrakes may also be used to increase the deceleration rate but be aware of the following:
.
Increase in VLS
.
Limited effect at low speeds
.
Auto-retraction when selecting (A343: CONF 3), (A333: CONF Full). There is no auto-retraction on A346 and enhanced A333 aircraft. Instead an ECAM caution SPD BRK STILL OUT alerts the crew to this fact if the engines are above idle or if the speedbrakes have been extended for more than 5 seconds when the aircraft is below 800 ft during the approach.
For consistency between types, retract the speedbrakes prior to selection of Flaps 3.
6.30.6
A330/A340 Holding And Approach REV 1 (6 JUN 05)
FCTM Instrument Approaches
F-PLN SEQUENCING
In NAV mode, the F-PLN will sequence automatically. In HDG/TRK mode, the F-PLN will only sequence automatically if the aircraft flies close to the programmed route. Correct F-PLN sequencing is necessary to ensure that the programmed missed approach route is available in the event of a go-around. If under radar vectors and automatic waypoint sequencing does not occur, the F-PLN should be manually sequenced. This can be achieved by either using the DIR TO RADIAL IN function or by deleting the FROM WPT repeatedly on the F-PLN page until the next likely WPT to be overflown is displayed as the TO WPT on the ND. However, when established on an ILS or LOC approach, do not perform a DIR TO as this will result in LOC reverting to NAV mode. In this case, the APPR or LOC will have to be re-armed to re-establish on the approach.
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A330/A340 機組訓練手冊 FCTM Flight Crew Training Manual(46)
