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Thread: Disengaging autobrakes in the 737 Classic
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Old 5th Mar 2018, 15:38
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Skyjob
 
Join Date: Jan 2000
Location: FL410
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To cancel the autobrake on the landing roll with toe brakes you must apply a brake pressure in excess of 800psi (ie less than that required for autobrake 1).

For the techies amongst us:

Autobrake Selector / Max Pressure at Brakes (PSI) / Deceleration Rate (ft/secē)
  1. 1 / 1250 / 4
  2. 2 / 1500 / 5
  3. 3 / 2000 / 7.2
  4. Max / 3000 / 12 (below 80kts)
  5. Max / 3000 / 14 (above 80kts)
  6. RTO / Full / Not Controlled

There is an "on ramp" period where autobrake pressure is applied over a period of time. Approximately 750psi is applied in 1.75 sec, then the pressures above are reached in another 1.25sec for autobrakes 1, 2, or 3 and approx. 1.0 sec for autobrake MAX.
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