An aircraft is considered to be maintaining its assigned level as long as the SSR mode C derived level information indicated that it is within:
Domanda 118, Air Law - ATPL - Airline Transport Pilot license
| +/- 300 ft of the assigned level. |
| +/- 500 ft of the assigned level. |
| +/- 250 ft of the assigned level. |
| +/- 200 ft of the assigned level. |
