When do the armed speed brakes of a B737-800 extend after landing?
Is it when the main gear makes contact with the ground, or must the nose gear also be on the ground?
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The system will extend the flight spoilers when any strut (either main gear or the nosewheel) compresses; the ground spoilers deploy after the right main gear strut compresses. Everything will deploy even if the nosewheel is held off the runway, although that's not a recommended landing technique.
Additionally, other conditions are required:
Additionally, the system will deploy the spoilers without detecting strut compression if it senses main gear wheels spinning up to 60+ knots (presumably both sides, but the manual I'm looking at isn't clear on that).
Source: an airline manual that isn't public domain, so no link or screenshot - sorry.