Nav-Aids P74418-4 Pitot-Static Adapter for Select Airbus & ATR Aircraft

The Nav-Aids P74418-4 is a pitot-static test adapter engineered for use during pitot-static system testing on select Airbus and ATR regional aircraft. It connects directly to the aircraft's pitot probes and interfaces with a pitot test hose assembly, allowing technicians to pressure-test the air data system in compliance with maintenance manual requirements. The adapter is designed to isolate each pitot-static system, allowing it to be tested individually or simultaneously – offering flexibility for a range of test procedures and maintenance scenarios.

The P74418-4 is compatible with the Airbus A300 and A310, as well as the ATR 42, ATR 42-500, and ATR 72 aircraft. All of these airframes share the same 0851JA pitot probe configuration, allowing a single adapter model to serve both the Airbus narrowbody and ATR turboprop platforms. Maintenance teams operating mixed fleets that include these aircraft types can standardize on the P74418-4 for pitot-static testing across all compatible airframes.

The P74418-4 is designed to fit the 0851JA pitot probes located on each side of the fuselage on compatible Airbus and ATR aircraft. A correct, secure fit is essential for achieving the airtight seal required for accurate pitot-static testing – any misalignment or incomplete seating can compromise results. Always verify probe model compatibility before beginning a test sequence to ensure both adapter performance and aircraft airworthiness.

Yes. Once the P74418-4 is installed and connected to a pitot test hose assembly, each pitot-static system can be isolated and tested either separately or simultaneously. Testing systems independently is useful for isolating a fault in a specific channel without disturbing the other, while simultaneous testing is commonly used for full air data system certification. This dual-mode capability makes the P74418-4 well-suited for both scheduled maintenance checks and fault-isolation procedures.

Two P74418-4 pitot test adapters are required per ATR 42 or ATR 72 aircraft to properly test both pitot probe locations – one on each side of the fuselage. Shops performing pitot-static testing on these airframes should ensure both adapters are on hand and in serviceable condition before beginning any test event. The adapter is sold individually, so quantities should be ordered accordingly based on fleet size and testing frequency.

Installation of the P74418-4 begins by backing off the compression nut, then fitting the adapter onto the pitot tube and ensuring the probe tip seats properly on the Teflon snubber inside the adapter. Holding the unit firmly in position, the compression nut is then tightened to secure the adapter to the probe. Finally, the blanking pads are adjusted to cover the drain holes, completing the installation and sealing the system for testing.

The Teflon snubber is an internal component of the P74418-4 adapter that the pitot probe tip must contact and seat against during installation. Proper seating on the snubber is critical – it ensures a consistent, airtight connection between the adapter and the probe, which directly affects the accuracy and reliability of pitot-static test results. Failing to seat the probe tip correctly on the snubber before tightening the compression nut can result in leaks or erroneous readings during testing.

The blanking pads on the P74418-4 are adjusted during installation to cover the drain holes on the pitot probe, sealing them off so they do not interfere with the pressurized test environment. Leaving the drain holes exposed during testing would allow air to escape, making it impossible to build and hold the pressure needed for accurate pitot-static system verification. Ensuring the blanking pads are properly positioned is a key final step before connecting the test hose assembly and beginning the test sequence.

Yes! While the P74418-4 is sold individually, it is also included as a core component in two Nav-Aids air data accessories kits. The ATR42-723 Air Data Accessories Kit bundles the hose assemblies and accessories needed for ATR 42 and ATR 72 testing, while the ADCATR42A320A330-945 Air Data Accessories Combination Kit expands coverage to include the Airbus A320 and A330. For shops maintaining multiple aircraft types across these platforms, the combination kit offers a convenient all-in-one solution.

The SK701 Seal Kit is a purpose-built replacement seal kit for the P74418-4 pitot test adapter (sold separately) and includes two spare seals. Seals should be inspected before each use and replaced at the first sign of wear, damage, or leakage – a compromised seal can cause pressure loss during testing and produce inaccurate results. Keeping the SK701 on hand ensures technicians can address seal wear on the spot without delaying a scheduled test event.