Which condition does not permit the assignment of an IAFDOF altitude?

The assignment of an Initial Approach Fix Departure Outer Fix (IAFDOF) altitude is influenced by various operational conditions and safety protocols. Stable weather conditions do not inherently restrict or prevent the assignment of an IAFDOF altitude because stable weather typically allows for predictable flight paths and safe navigation.

In contrast, conditions such as air traffic control direction or flight plan updates can directly dictate the altitude assignments, as controllers need to ensure safe separation between aircraft and efficient use of airspace. Similarly, military aircraft operating on random routes may introduce unexpected changes in traffic patterns, necessitating adjustments to altitudes to maintain safety and coordination within the controlled airspace.

Thus, stable weather conditions are not a factor that impedes the assignment of altitudes, making this choice the most accurate response.