When deploying manual style stabilizers/outriggers, the jack must be lowered until the:

The correct answer involves the jack resting firmly on the jack pads to ensure proper stability and support during aerial operations. When deploying manual style stabilizers or outriggers, the primary purpose is to distribute the weight of the aerial equipment evenly and secure the vehicle against tipping or shifting while in operation.

Lowering the jack until it makes firm contact with the jack pads achieves several important safety and operational objectives. It ensures the full weight of the apparatus is supported directly by the pads, which are designed to absorb the load and reduce the risk of equipment damage or instability. Additionally, this firm contact helps to prevent any unexpected movement or shifting, providing a secure working environment for operators.

Other options represent less optimal or safe practices, as they either do not guarantee full contact with the jack pads or suggest a position that could compromise stability. Therefore, the emphasis on making sure the jack is firmly on the jack pads is critical for the safety and effectiveness of the aerial operation.