Verbatim in the study guide.
The instructor takes the airplane when:
- Bank exceeds 60 degrees at any time.
- Airspeed exceeds the maneuvering speed for the actual weight of the airplane as flown, or reaches 1.2 Vs1 slow, in either case without correction applied.
- Altitude passes 1,500 ft AGL descending in the steep spiral or any air work.
- Nose-low pitch in a steep turn is not corrected within two seconds.
- Load factor is increased while the airplane is already outside the bank target.
- Either pilot is unclear about who is flying the airplane.
Hard floor: all air work is terminated by 1,500 ft AGL. North Aero policy, not regulation (US-3.4), and it is also the altitude the current AI.IX.B task requires the steep spiral to be completed by. Read the task on the day and use the higher of the two.
The maneuvering speed limit is stated as a rule, not a number, because it changes with weight and because the number belongs to the airplane being flown. The candidate looks it up before the flight, in that airplane's own approved material, and says it in the brief.
Positive exchange of controls, both directions, every time.