GO-AROUND FROM AN INTERMEDIATE APPROACH ALTITUDE /
DISCONTINUED APPROACH PROCEUDRE
Two scenarios need to be considered:
1) Go-Around from an intermediate approach altitude
To perform a go-around, from an intermediate altitude in the approach (e.g. Go-around from 1000ft with stop altitude of 2000ft) and if TOGA thrust is not required, proceed as follows:
SET the thrust levers to TOGA detent, then retard the thrust levers as required back to CLB (remember – "CLICK, CLICK" !)
This enables the engagement of the GO-AROUND phase, with associated AP/FD modes.
ALT* could occur very quickly. Clean up as normal. Follow Go-Around lateral procedure as normal. The previously flown approach will be strung automatically into the F-PLN.
2) Discontinued Approach Procedure
This procedure involves intervening with selected guidance and accelerating to green dot speed.
It avoids the possibility of engaging SRS mode with the FCU altitude set below the present aircraft altitude and also allows a less severe manoeuvre if climb performance is not a factor.
The following instructions are applicable when a discontinued approach is required from an altitude above missed approach altitude, or where the aircraft is not configured to transition to SRS mode, or when completing a go-around from an altitude that is close to missed approach altitude.
(e.g. Go-Around from 1800ft with a stop altitude of 2000ft; if TOGA thrust were used in this example, it would probably result in an altitude bust and flap overspeed.)
- Push V/S
- Select Green Dot speed
- If G/S is armed; push APPR Pb (LOC and G/S modes are disengaged)*
- PNF selects flap in one stage if required and requested by PF
- Retract landing gear if applicable
- PF uses V/S to achieve the desired altitude
- Flap retract on schedule (At no time are the trust levers moved to the TOGA detent)
* to prevent a possible false glideslope capture later.
NOTE: If the thrust levers are not set briefly to the TOGA detent (e.g. if flying the Discontinued Approach Procedure), flying over, or close to the airport (less than 7nm) may sequence the Destination waypoint in the F-PLN. In this case select a suitable DIR TO waypoint and reprogram the FMGS.