Beyond 50 miles from TOD, what is the preferred method for enroute descent?

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Multiple Choice

Beyond 50 miles from TOD, what is the preferred method for enroute descent?

When you’re more than 50 miles from the destination, the best approach is to pre-set a lower cruise altitude on the MCP CRZ page and begin a descent at about 1,000 feet per minute to that altitude, with the FMS staying in Cruise mode so VNAV PATH handles the leveling. This keeps a controlled, predictable vertical profile well in advance of the waypoint, reducing the risk of rushing descent or violating altitude constraints. It also leverages the FMC’s managed descent: once you reach the new cruise altitude, VNAV PATH will level you automatically. Holding altitude stores the aircraft at the current level and delays descent, which isn’t efficient and can complicate meeting constraints. Manually intervening with ALT INTV removes the managed descent benefit, adding potential for less coordinated vertical motion. Descending at 500 fpm is slower and may not meet the planned altitude transitions in time, leading to a less optimal profile.

When you’re more than 50 miles from the destination, the best approach is to pre-set a lower cruise altitude on the MCP CRZ page and begin a descent at about 1,000 feet per minute to that altitude, with the FMS staying in Cruise mode so VNAV PATH handles the leveling. This keeps a controlled, predictable vertical profile well in advance of the waypoint, reducing the risk of rushing descent or violating altitude constraints. It also leverages the FMC’s managed descent: once you reach the new cruise altitude, VNAV PATH will level you automatically.

Holding altitude stores the aircraft at the current level and delays descent, which isn’t efficient and can complicate meeting constraints. Manually intervening with ALT INTV removes the managed descent benefit, adding potential for less coordinated vertical motion. Descending at 500 fpm is slower and may not meet the planned altitude transitions in time, leading to a less optimal profile.

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