Flight Deck Procedures Before Atlantic Crossing

A transatlantic flight involves a carefully structured sequence of tasks on the flight deck before the aircraft enters oceanic airspace. Pilots must complete planning, communication, navigation, and verification to ensure the aircraft enters procedural airspace with an accurate route, reliable communications, and the correct altitude already established.

North Atlantic procedures are no longer completely uniform. The 2026 edition of NAT Doc 007 introduced further differences between oceanic control areas. Crews must therefore know which control area they are approaching and apply its specific requirements, rather than relying on one universal procedure.

Oceanic Clearance

The request for oceanic entry coordination begins long before the aircraft reaches the boundary. For operations involving Gander Oceanic Control, the 2026 procedures call for a Route Clearance (RCL) to be sent between 60 and 90 minutes before the Oceanic Entry Point. This timing allows air traffic control to build its traffic picture.

The process is not identical throughout the region. Gander now operates under Oceanic Clearance Removal, meaning the RCL is used for planning rather than as a request for a separate oceanic clearance. The aircraft continues on its existing domestic clearance unless ATC provides different instructions. In contrast, Shanwick (EGGX) was still issuing oceanic clearances under the 2026 procedures described by OPSGROUP, while Reykjavik (BIRD) no longer required an RCL. The flight crew must first identify which Oceanic Control Area it is entering, then follow that area's specific process.

For aircraft equipped with Controller Pilot Data Link Communications (CPDLC), cockpit workload includes logging onto the appropriate oceanic authority. TrainingPort's review places CPDLC or ADS-C logon approximately 10 to 25 minutes before the boundary. This connection provides another communications channel for entering airspace where traditional radar coverage and continuous VHF communication may not be available.

Navigation Verification

Once the oceanic routing is established, each waypoint must be independently verified by both pilots. Particular attention is paid to the coordinates stored in the aircraft's navigation system. The 2026 NAT Doc 007 identifies potential traps involving half-degree waypoints, ARINC 424 coding, and CPDLC route amendments that may provide full latitude and longitude information without appearing identical to the waypoint name already stored.

The Master Computer Flight Plan is central. One document is treated as the master on the flight deck, and the navigation system is checked against it. The pilots independently verify the entries to prevent a single data-entry mistake from being accepted. The verification goes beyond confirming waypoint names. Crews compare the expanded latitude and longitude coordinates, then examine the magnetic course and distance between waypoints.

NAT guidance recommends comparing the Master Document with the long-range navigation system using operator-established tolerances, with ±2 degrees and ±2 nautical miles cited as an example. A waypoint inserted one degree away from its intended position can produce a significant lateral deviation. Independent course and distance checks provide another opportunity to detect discrepancies. This rigor is necessary because aircraft operate with greater reliance on onboard navigation and data communications over the ocean.

Oceanic Communications

Communication equipment receives its own preparation before oceanic entry. Flight crews have several ways to communicate with controllers, and those systems need to be ready. High frequency (HF) radio remains an important part of the communications architecture.

HF radio checks should be completed before oceanic entry when possible. SELCAL, or Selective Calling, must also be checked at each Oceanic Control Area boundary even when the aircraft is equipped with datalink. SATCOM data communications are checked when applicable. CPDLC and ADS-C users log onto the appropriate authority before reaching the boundary.

SELCAL is particularly useful because it allows controllers to alert a specific aircraft without requiring the pilots to monitor HF continuously. This reduces the need for crews to listen to noisy HF frequencies throughout a long crossing. The layered approach reflects the operational environment. No single communications system is expected to carry the entire burden. If one channel becomes unavailable, another may provide a means of contact.

Communication checks are performed before the aircraft needs them. A problem discovered while the aircraft is still near the departure side of the Atlantic can be investigated with comparatively little disruption. Discovering the same problem after entering oceanic airspace leaves fewer options.

Flight Level and Oceanic Entry

Altitude is another critical factor that must be resolved before the boundary. The aircraft is expected to cross the Oceanic Entry Point at the flight level assigned for the oceanic portion of the flight. This requirement affects the clearance request. Crews communicate the flight level they want and the highest level they expect to reach at the boundary, allowing ATC to consider the aircraft's performance and traffic.

However, the oceanic level can differ from the domestic clearance. A crew may be flying at one flight level while approaching the coast, then receive an oceanic assignment requiring a climb or descent. That change has to be coordinated with domestic ATC before the boundary. North Atlantic traffic is organized around carefully planned routes and flight levels, with separation procedures designed for an environment without conventional radar coverage.

Being at the correct altitude before the boundary forms part of the aircraft's readiness state. The pilots ensure the aircraft arrives at the entry point already configured to operate under the applicable separation and routing system. This preparation reduces the possibility of a last-minute climb request creating additional complexity. If the aircraft cannot achieve the requested level, the crew has an opportunity to notify ATC before reaching the boundary and obtain an alternative.