CoolGuy From United States of America, joined Jan 2005, 414 posts, RR: 0 Posted (7 years 8 months 1 day 20 hours ago) and read 32767 times:
Sometimes I see the numbers on the side of the runway decreasing quite rapidly before a 737 I'm on lands: 9, 8, 7... When would a pilot need to abort a landing? (Suppose clear weather.) Sometimes it feels like the plane is just hovering a few feet above the runway (maybe due to the ground effect) and I always wonder if it's going to go back up. (That happened to me once but only because the plane never got clearance to land!)
Conditions: Sea Level, ISA, Zero Wind, Anti-skid operative, Automatic Speed Brakes
Definition of required landing distance:
The Required Landing Distance is the demonstrated landing distance divided by 0.6; demonstrated landing distance is based on a speed of 1.3xVs in landing config at the 50ft point; dry smooth level, hard surfaced runway; brakes fully applied, no thrust reverse.
Required landing distance wet is 1.15 times the dry one.
For emergencies actual landing distances are used (but you have to keep in mind that you won't reach the Boenig test pilots' values), for example:
One Engine Inoperative, Flaps 15 Landing, Standard Conditions, 46t: 820m
(1m = 3.281ft; 1t = 2204.6lb)
If you like the get more information - let me know. I have stand-by and am quite bored
CoolGuy From United States of America, joined Jan 2005, 414 posts, RR: 0
Reply 2, posted (7 years 8 months 1 day 7 hours ago) and read 32767 times:
I'm really wondering when a landing would be aborted if it doesn't touch down in time. Sometimes I see the airplane sort of hovering slightly above ground for a long time (well, longer than I would expect by looking out the window).
Flyf15 From , joined Dec 1969, posts, RR:
Reply 3, posted (7 years 8 months 1 day 6 hours ago) and read 32767 times:
Quoting CoolGuy (Reply 2): I'm really wondering when a landing would be aborted if it doesn't touch down in time. Sometimes I see the airplane sort of hovering slightly above ground for a long time (well, longer than I would expect by looking out the window).
Landing requirements are based on the aircraft crossing the threshold of the runway at a certain altitude and airspeed and touching down within the touchdown zone. This usually means crossing the threshold at Vref with a decelerating trend, at 50ft agl, and touching down in the first 3000ft of the runway.
Viscount724 From Switzerland, joined Oct 2006, 25626 posts, RR: 22
Reply 6, posted (7 years 7 months 4 weeks 1 day 1 hour ago) and read 32767 times:
Quoting Mighluss (Reply 4): think Santos Dumont is the shortest rwy, that receives 737's in a normal basis. It has just 4341 ft
Boeing has developed special short-runway modifications for the 737NG, mainly to facilitate Gol's operations of the 737-800 to/from SDU with its very short runways ending in water at both ends. Related Boeing press release: