Final answer:
When a crewmember shows signs of intoxication, the FOM probably recommends removing them from duty and potentially conducting an objective Field Sobriety Test to assess their fitness for duty.
Step-by-step explanation:
If the van driver expresses concern that one of your crewmembers is showing signs of intoxication, the Flight Operations Manual (FOM) likely provides specific procedures for handling such scenarios. These procedures would prioritize safety and include removing the crewmember from duty to prevent any potential risk to operations. Guidance may involve conducting a more formal assessment like the Field Sobriety Test (FST) to objectively evaluate the crewmember's state. The FOM would also likely dictate the necessary documentation and reporting procedures, as well as the steps for the crewmember's potential return to duty, which would include ensuring they are no longer under the influence of alcohol and fit for the responsibilities.
The FST makes use of the coordination exam, which tests a person's ability to perform tasks that require a balance and coordinated movement. Since the cerebellum is responsible for these functions and is sensitive to ethanol, signs of intoxication can be effectively detected through such a test.