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737-300 Touchdown in Crab

 
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K.Haroon
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Joined: 11 Dec 2005
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PostPosted: Fri Feb 22, 2008 11:56 am    Post subject: 737-300 Touchdown in Crab Reply with quote

The airplane can land using crab only (zero side slip) upto the landing croswind guideline speeds. On dry runways, upon touchdown the airplane tracks towards the upwind edge of the runway while de-crabing to align with the runway. Immediate upwind aileron is needed to ensure the wings remain level while rudder is needed to track the runway centerline. The greater the amount of crab at touchdown, the larger the lateral deviation from the point of touchdown. For this reason, touchdown in a crab only condition is not recommended when landing on a dry runway in strong crosswinds.

On very slippery runways, landing the airplane using crab only reduces drift towards the downwind side at touchdown, permits rapid operation of spoilers and autobrakes because all main gears touchdown simultaneously, and may reduce pilot workload since the airplane does not have to be de-crabbed before touchdown. However, proper rudder and upwind aileron must be applied after touchdown to ensure directional control is maintained.
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