Final answer:
When unable to receive instructions at a towered airport, there are procedures to follow such as maintaining the last assigned altitude and following published procedures.
Step-by-step explanation:
When approaching a towered airport, it is essential to receive instructions from air traffic control (ATC) for safe and efficient operations. However, if you are unable to receive instructions, there are established procedures to follow.
Firstly, maintain the last assigned altitude and follow the published approach and landing procedures for the specific airport. Secondly, monitor the appropriate radio frequency for any communication from ATC or other pilots. Thirdly, if necessary, exit the airspace and communicate your situation once you have established contact with ATC.