Final answer:
Attach a Repairable (Condition B) tag to an HGU-55 helmet awaiting parts for repair, indicating it is unserviceable but can be fixed with received parts.
Step-by-step explanation:
If an HGU-55 helmet is brought in for repair and not all parts are available to complete the repair, the condition tag that should be attached is typically a Repairable (Condition B) tag or equivalent, which is used to indicate that the item is not currently serviceable but can be repaired once all parts are received. This is standard procedure in many military and aviation maintenance protocols to ensure that equipment is properly tracked and managed. The specifics, however, can vary based on the military branch or organization's regulations. Always refer to the relevant technical orders or maintenance manuals for precise instructions on tagging equipment that cannot be immediately repaired.
When not all of the necessary parts have been received to repair an HGU-55 helmet, a special condition tag called a "Hold for Parts" tag should be attached to the helmet. This tag indicates that the repair cannot be completed because some parts are missing and the helmet should not be used until the necessary parts are received and the repair is completed.