Ground Operation
During landing, the auto speed brake system operates when these conditions occur:
- SPEED BRAKE lever is in the ARMED position.
- SPEED BRAKE ARMED light is illuminated.
- Radio altitude is less than 10 feet.
- Landing gear strut compresses on touchdown.
Note: Compression of any landing gear strut enables the flight spoilers to deploy.
Compression of the right main landing gear strut enables the ground spoilers to deploy.
- Both thrust levers are retarded to IDLE.
- Main landing gear wheels spin up (more than 60 kts).
The SPEED BRAKE lever automatically moves to the UP position and the spoilers deploy.
If a wheel spin-up signal is not detected, when the air/ground system senses ground mode
(any gear strut compresses) the SPEED BRAKE lever moves to the UP position and flight
spoiler panels deploy automatically. When the right main landing gear strut compresses, a
mechanical linkage opens the ground spoiler bypass valve and the ground spoilers deploy.
