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The subject matter of this specification can be embodied in, among other things, a track lock assembly that includes a pawl assembly comprising a pawl arm extending from a pawl axis and configured to engage a slot in a slider assembly, a cam arm extending from the pawl axis and having a pawl cam, an

The subject matter of this specification can be embodied in, among other things, a track lock assembly that includes a pawl assembly comprising a pawl arm extending from a pawl axis and configured to engage a slot in a slider assembly, a cam arm extending from the pawl axis and having a pawl cam, and a compliant member, and a position lock assembly comprising a first lock arm extending from a lock axis and an actuator configured to urge rotation of the first lock arm between a lock locked position and a lock unlocked position, the first lock arm configured to engage and retain the cam arm in a pawl locked position when the first lock arm is in the lock locked position and disengage the cam arm in the lock unlocked position such that the compliant member is able to urge the pawl assembly to a pawl unlocked position.

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1. A track lock assembly comprising: a pawl assembly comprising: a pawl arm extending from a pawl axis to a distal end configured to engage a slot in a slider assembly and contact a slot end of the slot;a cam arm extending from the pawl axis and having a pawl cam; anda biasing member configured to u

1. A track lock assembly comprising: a pawl assembly comprising: a pawl arm extending from a pawl axis to a distal end configured to engage a slot in a slider assembly and contact a slot end of the slot;a cam arm extending from the pawl axis and having a pawl cam; anda biasing member configured to urge rotation of the pawl assembly about the pawl axis from a pawl locked position, such that the distal end of the pawl arm is engaged in the slot and is positioned to contact the slot end upon movement of the slider assembly and the pawl cam is disengaged from a slider cam extending from the slider assembly, to a pawl unlocked position such that the distal end of the pawl arm is biased away from the slot to a position that does not interfere with movement of the slider assembly and the pawl cam is biased toward contact with the slider cam extending from the slider assembly; anda position lock assembly comprising a first lock arm extending from a lock axis and an actuator configured to urge rotation of the first lock arm between a lock locked position and a lock unlocked position, the first lock arm configured to engage and retain the cam arm in the pawl locked position when the first lock arm is in the lock locked position and disengage the cam arm in the lock unlocked position such that the biasing member is able to urge the pawl assembly to the pawl unlocked position. 2. The track lock assembly of claim 1, wherein the slider assembly is configured to slide the slider cam and the slot substantially perpendicular to the pawl axis such that movement of the slider assembly urges contact between the slider cam and the lock cam and rotation of the pawl assembly into the pawl locked position. 3. The track lock assembly of claim 1, further comprising a sensor configured to provide a first indication when the position lock assembly is in the lock locked position and provide a second indication when the position lock assembly is in the lock unlocked position. 4. The track lock assembly of claim 1, further comprising a manual lock assembly having a first configuration which does not affect movement of the position lock assembly, and a second configuration in which the position lock assembly is urged into the lock unlocked position. 5. The track lock assembly of claim 1, wherein the slider assembly is configured to slide the slider cam and the slot substantially perpendicular to the pawl axis, such that movement of the slider assembly urges contact between the slider cam and the lock cam and urges rotation of the pawl assembly into the pawl locked position where the pawl assembly will contact the slot end should inadvertent motion of the slider and slot towards the pawl axis occur. 6. A track lock assembly comprising: a pawl assembly comprising: a pawl arm extending from a pawl axis to a distal end configured to engage a slot in a slider assembly and contact a slot end of the slot;a cam arm extending from the pawl axis and having a pawl cam;and a biasing member configured to urge rotation of the pawl assembly about the pawl axis from a pawl locked position such that the distal end of the pawl arm is engaged in the slot and is positioned to contact the slot end upon movement of the slider assembly and the pawl cam is disengaged from a slider cam extending from the slider assembly to a pawl unlocked position such that the distal end of the pawl arm is biased away from the slot to a position that does not interfere with movement of the slider assembly and the pawl cam biased toward contact with the slider cam extending from the slider assembly; anda position lock assembly comprising an actuator configured to selectably engage the pawl assembly to retain the pawl assembly in the pawl locked position and disengage the pawl assembly which does not affect movement of the pawl assembly between the pawl locked position and the pawl unlocked position. 7. The track lock assembly of claim 6, wherein the slider assembly is configured to slide the slider cam and the slot substantially perpendicular to the pawl axis such that movement of the slider assembly urges contact between the slider cam and the pawl cam and urges rotation of the pawl assembly into the pawl locked position. 8. The track lock assembly of claim 6, further comprising a sensor configured to provide a first indication when the position lock assembly is engaged with the pawl assembly and provide a second indication when the position lock assembly is disengaged from the pawl assembly. 9. The track lock assembly of claim 6, further comprising a manual lock assembly having a first configuration which does not affect engagement of the position lock assembly with the pawl assembly, and a second configuration in which the position lock assembly is urged into engagement with the pawl assembly. 10. The track lock assembly of claim 6, wherein the pawl arm includes an angular pawl face at the distal end opposite the pawl axis, and the slot end has an angular end face that is complimentary to the angular pawl face. 11. A method of locking a track, comprising: providing a track lock assembly proximal a slider assembly, the track lock assembly comprising: a pawl assembly having a pawl cam and a pawl arm configured to pivot together about a pawl axis between a pawl locked position in which the pawl arm engages a slot in the slider assembly, and a pawl unlocked position; anda position lock assembly configured to selectably permit or prevent movement of the pawl assembly between the pawl locked position and the pawl unlocked position;sliding the slider assembly in a first direction perpendicular to the pawl axis;contacting a slider cam to the pawl cam in the pawl unlocked position;urging, by contact between the slider cam and the pawl cam, rotational movement of a distal end of the pawl arm into the slot; andcontacting a slot end with the distal end as to interfere with sliding of the slider cam in the first direction. 12. The method of claim 11, further comprising: locking, by the position lock assembly, the pawl assembly in the pawl locked position such that the distal end of the pawl arm is within the slot. 13. The method of claim 12, further comprising: unlocking, by the position lock assembly, the pawl assembly;rotating the pawl assembly to the pawl unlocked position such that the distal end of the pawl arm is removed from the slot; andsliding the slider assembly in a second direction opposite the first direction perpendicular to the pawl axis. 14. The method of claim 11, wherein: the pawl assembly further comprises a biasing member configured to urge the pawl assembly into the pawl unlocked position;urging, by contact between the slider cam and the pawl cam, rotational movement of the distal end of the pawl arm into the slot further comprises biasing the biasing member; androtating the pawl assembly to the pawl unlocked position such that the distal end of the pawl arm is removed from the slot comprises urging, by the biasing member, rotation of the pawl assembly to the pawl unlocked position such that the distal end of the pawl arm is removed from the slot. 15. The method of claim 11, further comprising: providing a manual lock assembly having a first configuration which does not affect movement of the position lock assembly, and a second configuration in which the position lock assembly is urged into a lock unlocked position; andconfiguring the manual lock assembly into the second configuration to urge the position lock assembly into the lock unlocked position. 16. The method of claim 11, further comprising: providing a sensor configured to identify a lock locked position and a lock unlocked position;providing, by the sensor, a first indication when the position lock assembly is in the lock locked position; andproviding, by the sensor, a second indication when the position lock assembly is in the lock unlocked position. 17. The method of claim 11, further comprising: unlocking, by the position lock assembly, the pawl assembly, wherein the pawl arm includes an angular pawl face at the distal end opposite the pawl axis;sliding the slider assembly in a second direction opposite the first direction perpendicular to the pawl axis, wherein the slot end has an angular end face that is complimentary to the angular pawl face; andcontacting the angular end face with the angular pawl face as to urge rotation of the pawl assembly to the pawl unlocked position such that the distal end of the pawl arm is removed from the slot.