Figure 14-40.  Traffic pattern operation—parallel runways.  standard terminology. The AIM also contains many examples  of radio communications.  ICAO has adopted a phonetic alphabet that should be used in  radio communications. When communicating with ATC, pilots  should use this alphabet to identify their aircraft.  [Figure 14-41]  If the transmitter becomes inoperative, a pilot should follow  the previously stated procedures and also monitor the  appropriate ATC frequency. During daylight hours, ATC  transmissions may be acknowledged by rocking the wings  and at night by blinking the landing light.  When both receiver and transmitter are inoperative, the pilot  should remain outside of Class D airspace until the flow of  traffic has been determined and then enter the pattern and  watch for light signals.  Radio malfunctions should be repaired before further  flight. If this is not possible, ATC may be contacted by  telephone requesting a VFR departure without two-way radio  communications. No radio (NORDO) procedure arrivals  are not accepted at busy airports. If authorization is given  to depart, the pilot is advised to monitor the appropriate  frequency and/or watch for light signals as appropriate.  It is possible that a pilot might experience a malfunction of  the radio. This might cause the transmitter, receiver, or both  to become inoperative. If a receiver becomes inoperative and a  pilot needs to land at a towered airport, it is advisable to remain  outside or above Class D airspace until the direction and flow  of traffic is determined. A pilot should then advise the tower of  the aircraft type, position, altitude, and intention to land. The  pilot should continue, enter the pattern, report a position as  appropriate, and watch for light signals from the tower. Light  signal colors and their meanings are contained in  Figure 14-42 .  Lost Communication Procedures  14-23  LEGEND  Standard left-hand  traffic pattern (depicted)  Right-hand traffic  pattern (depicted)  Final  Departure  Base Crosswind  Final  Departure  Base Crosswind  Downwind  Entry  No transgression zone  No transgression zone Segmented circle  3  4  6  6  5  2  1  3  4  6  6  5  2  1 