Which statement correctly describes when interim altitudes must be entered in data blocks?

Which statement correctly describes when interim altitudes must be entered in data blocks?

• A. All interim altitudes must be entered.
• B. There is no requirement to enter JAN or MLU interim altitudes that are LOA-compliant; all other interim altitudes must be entered.
• C. JAN/MLU interim altitudes must be entered regardless.
• D. Interim altitudes are optional.

Answer: (B)

Interim altitude entries are guided by whether the altitude is already authorized under the LOA for specific fixes. If an interim altitude at JAN or MLU is LOA-compliant, it is already covered by the LOA and does not need to be entered in the data blocks. For all other interim altitudes that are not LOA-compliant, you must enter them to ensure the flight plan and the automation systems reflect the temporary altitude constraints and maintain proper separation. In other words, you don’t need to duplicate LOA-approved interim altitudes, but you do need to document any interim altitude that isn’t covered by the LOA. The other options would require entering every interim altitude, or treating these entries as optional, which would conflict with the need to accurately convey non-LOA-supported changes or temporary restrictions.

Interim altitude entries are guided by whether the altitude is already authorized under the LOA for specific fixes. If an interim altitude at JAN or MLU is LOA-compliant, it is already covered by the LOA and does not need to be entered in the data blocks. For all other interim altitudes that are not LOA-compliant, you must enter them to ensure the flight plan and the automation systems reflect the temporary altitude constraints and maintain proper separation.

In other words, you don’t need to duplicate LOA-approved interim altitudes, but you do need to document any interim altitude that isn’t covered by the LOA. The other options would require entering every interim altitude, or treating these entries as optional, which would conflict with the need to accurately convey non-LOA-supported changes or temporary restrictions.