Any deviation of more than 2 points.

Precision approach DA/H vertical profile is lower than 1 point.

The presence of four red lights or four white lights when equivalent references at airports

Press the ALT button to use the height hold mode

Select the V/S mode after the vertical speed decreases

The required visual reference is not established.

Loss of required visual reference.

The aircraft is not located within the runway sideline/sideline light horizontal extension line.

3.7 nautical miles before the BOSGI point: Verify that the FMA indicates that the ALT mode is active, and pre-select the altitude of the FAF point of 1700 and FPA

3 nautical miles before the BOSGI point: pull the FPA and fly in strict accordance with the trajectory shown on the chart

1 nautical mile before the BOSGI point: ARM the APPR and verify the conditions for the FINAL APP to active.

At BOSGI the latest, check that the FINAL APP active and FMA displays the green FINAL APP

Check After the green FINAL APP active, set the go-around altitude, and continuously monitor the horizontal and vertical tracks

FMA horizontal displays APP NAV armed or active.

The FINAL APP vertical mod is armed

A blue descent arrow is displayed on ND at or after the FAF point

Altitude changes, unless specifically requested by the ATC controller, to prevent unnecessary RA warnings when approaching the target altitude less than 2000 feet, the vertical speed is not greater than 1500fmin, and when approaching the target When less than 1000 feet, the vertical speed is not more than 1000ft/min;

If ATC reports a risk of conflict or is concerned about aircraft activity in the vicinity, it shall promptly adjust the distance circle 10 or 20 nautical miles, need to continue to check through ND and pay attention to the surrounding aircraft activity.

Pay attention to timely adjustment of TCAS monitoring range during climbing or descending, climbing with-ABOVE mode, descending -BELOW mode.