Step by Step Guide

A318/319/320/321
Profesional
Step-By-Step Tutorial
Vol
6
06-01- 57
11. Dezember 2018
Top of Descent – Initiate descent
175.
At 10.000 feet: As soon as the altitude of 10.000 feet is reached the speed restriction of 250 knots
becomes valid. The aircraft will start to reduce its speed in order to reach 250kt at FL100. The actual
Deceleration point will therefore be slightly earlier than FL100 to indicate where it will start to slow
down.
ND: Deceleration Point
176.
LS Pushbutton: Activate when passing FL100. If the button is used the Glideslope as well as the
Localizer shows up on the PFD. The ND display shows ILS27L on top as soon as the remaining distance
to destination is 250 NM or less. This normally happens at transition level or at 10.000 feet and
depends on which of the two value is higher.
177.
Transition Level: Setting up the MCDU PERF APPR page we set it to FL070 for the approach (#210). So
at this altitude the Barometric Reference Value will be set (as well as on ISIS).
178.
Baro Ref Cross Check: The QNH value entered in the MCDU PERF APPR page is used by the copilot. If
no value has been entered there then the current ambient pressure value will be used (= keyboard
[B]). It is not mandatory to fill the QNH-field in the MCDU – PERF – APPR page. But if a value is
entered the unit used (inHg or hPa) must be identical with the settings the FCU – QNH display. If the
unit is later changed the value in MCDU PERF APPR page automatically will be adjusted. The P3D
standard conversion ratio of 1013 = 29.92 is used for this baro function.
Like in reality the copilot enters those figures in visible steps and not at once. Then there is a pause
of 2 seconds - during which the user can enter a different value – before the checklists continues.
T/D = 34.000 Feet
10.000 feet Deceleration Point