Which of the following is part of the VOR sign off requirements?

The correct choice pertains to the requirement of recording the date of inspection when signing off the VOR (VHF Omnidirectional Range) check. This is essential as it establishes the currency and validity of the VOR's operational status. The date helps ensure that the aircraft’s navigation equipment adheres to legal and operational standards, reflecting that the check was performed within the requisite timeframe as mandated by regulations for instrument operations.

Maintaining accurate documentation such as the date shows adherence to regulatory requirements, which are crucial for flight safety and operational legitimacy. This is vital for pilots, as ensuring that navigation aids are working correctly is essential in instrument flight conditions.

The other choices do not serve as part of the sign-off requirements for a VOR check, focusing instead on other aspects not mandated by the regulations for this specific inspection process.