# Altitude

how upfront the height of the airport landing ?..

Please elaborate, I canâ€™t understand anything :smile:

3 Likes

What do you mean

If you mean what altitude I cross the runway at on landing then that would be 100ft.

50 feet you should cross the runway threshold for landing.

Rule of thumb for landing:

• cross the threshold at 50 feet AGL, at that point put throttle to iddle
• start flaring at 30 feet AGL, with roughly 5-6Â° nose up pitch (bearing in mind that on a 747, 11Â° nose up at landing = tail strikeâ€¦)

Now in actual fact the 50 feet â€śruleâ€ť really depends on the aircraft type (gear height, ILS receiver position, radar receiver position etc.) which can slightly alter the actual TCH by 10-20 feet.

Actually the flare height is different for each airplane and the 50ft is a fixed value which brings you into the touch down zone.

@Aernout yep, thatâ€™s essentially what Iâ€™m saying above. Even the 50ft value is not exact: in a 747-400 on glideslope you wouldnâ€™t cross the threshold at exactely 50ftâ€¦

The 50 feet is based on the landing gear crossing the threshold :)

@Aernout ah yes ok I understand now that you were referring to the RA reading, my bad :)

1 Like

Ok thanks, I just prefer crossing the runway a little high over a little low! Thanks for the clarification!