The number of spare fuses available for use in flight must be:
Domanda 155, Operational Procedures - ATPL - Airline Transport Pilot license
| 10 % of the number of fuses of each rating with a minimum of 1 |
| 5 % of the number fuses of each rating with a minimum of 1 |
| 20 % of the number of fuses of each rating with a minimum of 2 |
| 10 % of the number of fuses of each rating with a minimum of 3 |
