Exam Question

(a) The illustrated handbrake mechanism utilizes a dead man's handle to control a brake band engaging a drum attached to the lifeboat lowering system. In the normal resting position (as shown in the sketch), the weight of the dead man's handle keeps the brake band taut, preventing the lifeboat from lowering. To lower the lifeboat, the operator must actively lift and hold the dead man's handle, releasing the brake band. The lifeboat then descends under its own weight.
Testing of Handbrake:
Static Test: A load of 1.5 times the maximum working load of the lifeboat is applied. The lifeboat is then raised 50-100 mm above its resting position and the brake engaged. The brake must securely hold the lifeboat in this position.
Dynamic Test: A load of 1.1 times the maximum working load is applied to the lifeboat. The lifeboat is lowered at maximum speed, and the brake is then applied. The total distance travelled by the lifeboat after brake application must not exceed 1 meter.