Final answer:
When flying under Class B airspace, there are altitude restrictions and communication requirements to be aware of.
Step-by-step explanation:
Approaching Class B airspace, if you will be flying under it, you need to be aware of the altitude restrictions and the communication requirements. Class B airspace is typically associated with major airports and has a defined vertical boundary. If you are flying under Class B airspace, you need to stay below the designated ceiling of that airspace. Additionally, you should monitor the appropriate air traffic control frequency and be prepared to communicate with them if instructed.