Question

During inflight alignment of the IRS, SET IRS HDG will appear in the CDU scratchpad. The crew should:

Answer 1

During inflight alignment of the IRS, the crew should enter the desired heading into the scratchpad and initiate the IRS alignment using the LSK. If the IRS HDG remains in the scratchpad, follow standard procedures or consult with maintenance. If the IRS HDG disappears from the scratchpad, monitor the alignment progress.

Step-by-step explanation:

During inflight alignment of the IRS, SET IRS HDG (Set IRS Heading) will appear in the CDU (Control Display Unit) scratchpad. The crew should:

1. Enter the desired heading using the scratchpad and then press the corresponding LSK (Line Select Key) to initiate the IRS alignment.
2. If the IRS HDG remains in the scratchpad after pressing the LSK, it means that the IRS alignment is not possible at the moment due to certain conditions. In such cases, the crew should follow the aircraft's standard operating procedures or consult with the aircraft's manufacturer or maintenance personnel.
3. If the IRS HDG disappears from the scratchpad after pressing the LSK, it indicates that the IRS alignment process has started. The crew should then monitor the progress of the alignment until it is completed.