The little pointer is the snorkel mast mechanical indicator to show the position of the head valve. In this case open.
Prior to the start of snorkeling the head valve sea water sensing system is testing by pressing the test button. It momentarily shorts across the sensing electrodes causing air to shut the headvalve. The OOD watches the pointer thru the periscope to verify the position with the electrical indicator on the ballast control panel.
Ok you A gang types. What's the problem if the indicator light says open and the pointer is shut. It could violate the Number ONE rule of submaring.
Prior to the start of snorkeling the head valve sea water sensing system is testing by pressing the test button. It momentarily shorts across the sensing electrodes causing air to shut the headvalve. The OOD watches the pointer thru the periscope to verify the position with the electrical indicator on the ballast control panel.
Ok you A gang types. What's the problem if the indicator light says open and the pointer is shut. It could violate the Number ONE rule of submaring.
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