UA.V.A.K8: Phraseology: altitudes, directions, speed, and time.

ACS Area V — Operations Task A: Radio Communications Procedures References: ACAdvisory CircularCloseFAA guidance that explains acceptable ways to comply with rules or understand FAA procedures. 107-2; AIMAeronautical Information ManualCloseFAA operational guidance and glossary material used to understand aviation procedures and terminology.; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-H-8083-25; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-G-8082-22

Key Concepts

Establishing Two-Way Communications and What to Say

• Before entering Class C airspace, establish two-way radio communication with the ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. facility and maintain it while inside. Your initial call should efficiently provide position, altitude, radar beacon code, destination, and a request for Class C services. If ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. replies with your callsign followed by “standby,” communications are established; if ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. replies without using your callsign, they are not established and you may not enter. If workload prevents services, ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. may instruct you to remain outside until they can accommodate you. The Class C “Outer Area” is normally 20 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. from the primary airport and is procedural, not charted. Plan calls far enough out to avoid infringing the boundary without authorization^[6].
• When operating on VHFVery High FrequencyCloseRadio frequency band used for many aviation communications and broadcasts., note that aviation radios use 118.0–136.975 MHz and are typically “720” or “760” channel sets with 25 kHz spacing (e.g., 118.025, 118.050). VHFVery High FrequencyCloseRadio frequency band used for many aviation communications and broadcasts. is line-of-sight—higher altitude yields greater range—so anticipate terrain/structure shadowing near the surface^[1].
• En route, ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services. centers (ARTCCs) use sector “discrete” frequencies. Expect frequency changes as you progress through sectors; reserve these frequencies for control-related use, and obtain weather/flight data via FSSFlight Service StationCloseFAA-certified briefing support for weather, NOTAMs, and flight information., company radio, or other appropriate facilities^[4].

Altitude, Direction, and Speed in Clearances and Procedures

• When departing a traffic pattern, continue straight out or exit with a 45° turn beyond the departure end of the runway—left turn in left traffic, right turn in right traffic—after reaching pattern altitude. Do not continue on a track that would penetrate the departure path of a parallel runway. Clear, concise transmissions about departure intentions help deconflict traffic (“departing straight-out,” “departing with a 45° left turn”) and align with pattern-direction expectations^[1].
• Obstacle Departure Procedures (ODPsObstacle Departure ProcedureCloseA crewed-aircraft departure procedure designed for obstacle clearance.) may publish crossing altitudes and speed restrictions. These are for obstacle clearance and/or design constraints and cannot be canceled or amended by ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services.. Expect to read back and comply precisely; do not negotiate these values on frequency^[4].
• RNAVArea NavigationCloseA navigation method that lets aircraft fly any desired path within navigation coverage. SIDs and graphic ODPsObstacle Departure ProcedureCloseA crewed-aircraft departure procedure designed for obstacle clearance. are RNAVArea NavigationCloseA navigation method that lets aircraft fly any desired path within navigation coverage. 1, requiring total system error not more than 1 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. for 95% of total flight time. This performance expectation underpins how tightly you must adhere to assigned headings/paths and speed/altitude constraints when these procedures are in use^[4].

Time and Distance Terminology You’ll Hear and Use

• Expect Further Clearance (EFCExpect Further ClearanceCloseA time or instruction used in IFR clearance and lost-communication procedures.) time and Estimated Time of Arrival (ETAEstimated Time of ArrivalCloseThe expected arrival time at a point or destination.) are core timing references. If you lose communications and your clearance limit is an initial approach fix, begin the descent/approach as close as possible to the EFCExpect Further ClearanceCloseA time or instruction used in IFR clearance and lost-communication procedures. time if received; otherwise, as close as possible to ETAEstimated Time of ArrivalCloseThe expected arrival time at a point or destination. computed from your filed or ATCAir Traffic ControlCloseThe system that manages controlled airspace, traffic flow, and aircraft separation services.-amended ETEEstimated Time EnrouteCloseThe expected time needed to fly from one point to another.. If the clearance limit is not an approach fix, proceed to one and commence descent/approach using the same EFCExpect Further ClearanceCloseA time or instruction used in IFR clearance and lost-communication procedures.-or-ETAEstimated Time of ArrivalCloseThe expected arrival time at a point or destination. logic^[5].
• For GPSGlobal Positioning SystemCloseSatellite navigation used by many drones for position hold, navigation, and return-to-home features. RAIMReceiver Autonomous Integrity MonitoringCloseGPS integrity monitoring used in aviation navigation.-dependent operations, verify RAIMReceiver Autonomous Integrity MonitoringCloseGPS integrity monitoring used in aviation navigation. availability for the intended route and time during preflight. If a continuous loss of RAIMReceiver Autonomous Integrity MonitoringCloseGPS integrity monitoring used in aviation navigation. of more than five (5) minutes is predicted for any part of the flight, delay, cancel, or reroute. When relying on certain receivers, check non-precision approach RAIMReceiver Autonomous Integrity MonitoringCloseGPS integrity monitoring used in aviation navigation. at airports spaced at intervals not to exceed 60 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. along the RNAVArea NavigationCloseA navigation method that lets aircraft fly any desired path within navigation coverage. 1 track, ensuring “Terminal” or “Approach” RAIMReceiver Autonomous Integrity MonitoringCloseGPS integrity monitoring used in aviation navigation. will be available at ETAEstimated Time of ArrivalCloseThe expected arrival time at a point or destination.^[2].
• Oceanic RNPRequired Navigation PerformanceCloseA performance-based navigation specification for how accurately aircraft must navigate. planning uses specific distance and time qualifiers: RNPRequired Navigation PerformanceCloseA performance-based navigation specification for how accurately aircraft must navigate. 10 based on a single LRNSLong-Range Navigation SystemCloseA navigation system used for long-range routing in crewed aviation. currently applies to the Gulf of Mexico; unless otherwise approved, the basic RNPRequired Navigation PerformanceCloseA performance-based navigation specification for how accurately aircraft must navigate. 10 time limit is 6.2 hours between position updates when only INSInertial Navigation SystemCloseA navigation system that estimates position from internal motion sensors and can drift over time./IRUInertial Reference UnitCloseA motion-sensing reference unit used by some navigation systems. provide long-range navigation. RNPRequired Navigation PerformanceCloseA performance-based navigation specification for how accurately aircraft must navigate. 10 or RNPRequired Navigation PerformanceCloseA performance-based navigation specification for how accurately aircraft must navigate. 4 eligibility permits 50 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles. lateral separation when properly annotated on the ICAOInternational Civil Aviation OrganizationCloseInternational aviation standards body. Some FAA procedures and flight plan references use ICAO terms. flight plan (Item 10 “R” and Item 18 “PBNPerformance Based NavigationCloseNavigation standards based on required system performance rather than only ground-based routes./A1” for RNP10 or “PBNPerformance Based NavigationCloseNavigation standards based on required system performance rather than only ground-based routes./L1” for RNP4)^[7].
• Some special operations embed explicit distance/time safety thresholds you may need to recognize or brief on frequency. Example: helicopter hot refueling should not be conducted when electrical storms are within 10 NMNautical MileCloseA distance unit used in aviation. One nautical mile is about 1.15 statute miles., and radio transmissions should be avoided during fueling to reduce ignition hazards^[8]. Potential hazards at heliports/helidecks are disseminated via NOTAMsNotice to Airmen / Notice to Air MissionsCloseOfficial notice about temporary conditions, hazards, or changes that can affect a flight.; timely notification supports safe decision-making and clear advisory broadcasts^[3].

Lost-Communications Phraseology and Actions

• If you lose two-way communications, set your transponder to Mode A/3, Code 7600. Attempt to reestablish contact on the last assigned frequency, with an FSSFlight Service StationCloseFAA-certified briefing support for weather, NOTAMs, and flight information. or ARINCAeronautical Radio, IncorporatedCloseAviation communications service referenced in lost-communication and en route communication procedures., and monitor NAVAIDNavigational AidCloseGround or satellite-based navigation aid used by pilots for position and routing. voice features. Using 121.5 MHz is permissible. If FSS/ARINCFlight Service Station / ARINCCloseCommunication options referenced in lost-communication procedures. contact is made, report position, altitude, last assigned frequency, and request further clearance from the controlling facility^[5].