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Crosswind Landing Accident.

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Crosswind Landing Accident.

Old 11th May 2024, 20:55
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Originally Posted by EXDAC
Autoland crosswind limits are typically much lower than manual landing limits. However, I don't know of any autoland system that does not establish runway alignment before flare starts. Are there any?

Sperry/Honeywell systems typically enter ALIGN mode at 150 ft RA and FLARE mode at 50 ft RA. If a pilot always handles a crosswind differently than autoland how do they build confidence that autoland will actually work at the crosswind limit?
The 737;Classic auto-lands with full crab. Pilot disconnects autopilot upon MLG touchdown and de-crabs before NLG touchdown.
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Old 11th May 2024, 21:08
  #102 (permalink)  
 
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Originally Posted by 733driver
The 737;Classic auto-lands with full crab. Pilot disconnects autopilot upon MLG touchdown and de-crabs before NLG touchdown.
Interesting, thanks. All the systems I worked on had automatic nose lowering and roll-out mode. I would think the transition from a full crab touchdown to manual alignment, nose lowering, and rollout wiould be quite "uncomfortable". What RVR and DH is that system approved for?
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Old 11th May 2024, 22:15
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Originally Posted by EXDAC
Interesting, thanks. All the systems I worked on had automatic nose lowering and roll-out mode. I would think the transition from a full crab touchdown to manual alignment, nose lowering, and rollout wiould be quite "uncomfortable". What RVR and DH is that system approved for?
Cat3a. Works bloody well too.
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Old 12th May 2024, 06:53
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Originally Posted by punkalouver
I find this quote from the report interesting:

"CL-604 Operating Manual The manufacturer’s Operating Manual (OM) stated in ‘NORMAL PROCEDURES, Approach and Landing’ that VREF+X is calculated by adding a wind correction of ‘half steady state crosswind plus all gust (regardless of direction). Maximum correction is + 20 KIAS’ to the VREF. For the reported wind of from 300° at 13 kt gusting 25 kt, and a VREF of 123 kt, this equates to a VREF +X of 142 kt".

On most airliners, it has traditionally been half(or a third) the steady state headwind plus all of the gust.

Anybody seen this before on other aircraft?
Dassault is using, or at least used to use, half headwind (component) + full gust. So on RWY 26 with wind 200/10G20 you would have about 6kt headwind component and 10kt correction for gusts giving you a delta Vref of 16kt.
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Old 14th May 2024, 09:30
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........if you look after an A/C it may help, look after you.
U/C, tyres specifically. Landing with crab must be putting a lot of stress on tyres, not to mention, the whole aircraft. A disintegrating tyre is capable of bringing down an aircraft.......

I always wince at any suggestion of touching down while crabbed - that is abuse of mechanicals !

Especially since it is easy enough to de-crab while flaring - before the mains touch.

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Old 14th May 2024, 17:58
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Originally Posted by Uplinker
I always wince at any suggestion of touching down while crabbed - that is abuse of mechanicals !

Especially since it is easy enough to de-crab while flaring - before the mains touch.
'
ere, 'ere, 'ere
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