Say "hello" to the "limitations section".
From my “limitations” section:
Maximum Dry runway Wind Limits Takeoff and Landings:
Maximum Steady State Wind Velocity…………….. 50 kts.
Maximum Gust Velocity……………………………. 20 kts.
Maximum Crosswind
Flight Crews shall comply with the crosswind guidelines contained in the Environmental Procedures section.
Crosswind Takeoff & Takeoff Crosswind Limits
Braking Action ////Max Crosswind 737-400 /// NG without / with winglets
Dry 40 36 / 34
Good 25 25
Medium 16 15
Poor 10 10
Crosswind considerations.
1. For dispatch, use steady state wind velocity for crosswind computations.
2. Guest velocities are advisory, however, operations with a steady state component near the crosswind limits with higher gusts should be considered unacceptable.
3. The Captain may choose to further reduce these limits based on such factors as MELs, guest velocity, runway width/length, braking action, weather, pilot currency and aircraft experience.
In summary; the amount of crosswind you can accept on a runway for takeoff (and landing) varies, starting with the braking action (traction ability) of the departing runway.
A 90 degree, direct crosswind, at 35 knots on a bone dry brand new long runway technically works for a -400 and NG without winglets, but not for a NG with winglets (34 knot limit).
Just checking but the gust is the controlling number for takeoff or am i dreaming that up.
You have a 15 knot gust, the upper "limit" is 20 knots, so your 15 knot gust example is below the limitation. If by "controlling" I understand you to mean limiting-beyond which is not approved operations, then no the 15 knot gust is not controlling. However, the "company/airline" may have stricter, more limiting, numbers. In such a case then yes the 15 knots would be controlling/limiting. The pilot may for whatever reason have a lower guest limit as well, and that would be controlling/limiting.
If you were flying a NG with winglets your 90 degree crosswind at 35 knots gusting to 50, would be one knot beyond your dry runway limit of 34 knots. "For dispatch, use steady state wind velocity for crosswind computations" (from the environmental section of my manual).
Are you a pilot flying these machines, or any other aircraft, or a flight simmer?
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Last edited by Northbeach; 19th February 2011 at 22:23.