If a complete loss of hydraulic pressure occurs during ATM operation, what is the recommended action?

A complete loss of hydraulic pressure during Auxiliary Power Unit (APU) operation is a critical situation that requires immediate action. The recommended response in such a scenario is to shut down the affected Aerodynamic Test Module (ATM) immediately. This recommendation is based on safety protocols designed to prevent further damage to the ATM system or create hazardous conditions.

When hydraulic pressure is lost, critical systems that rely on hydraulic fluid for operation may become inoperable or unstable. Continuing to operate the ATM under these conditions can lead to uncontrolled movements or failures, which could jeopardize the safety of the personnel involved and the equipment itself. Shutting down the ATM ensures that no further complications arise and allows for a thorough inspection and assessment of the hydraulic system before any further action is taken.

While notifying maintenance personnel is also important, it should occur after ensuring that the ATM has been safely shut down. Restarting the ATM without hydraulic pressure could exacerbate the situation, and a complete operational halt is necessary for maintenance personnel to diagnose and resolve the hydraulic failure effectively.