Final answer:
The Engine Health Indicator Test/Anti-Ice Check and HIT Baseline Procedures Check are necessary for maintaining aircraft engine performance and safety, especially in icy conditions. These tests may change over time due to updates from manufacturers or new aviation standards, and operators must remain informed about such changes to maintain safety and compliance.
Step-by-step explanation:
The Engine Health Indicator Test/Anti-Ice Check, and HIT Baseline Procedures Check are specific assessments and maintenance procedures for aircraft engines. These tests are crucial for ensuring the engine's performance and safety during adverse weather conditions. Aircraft manufacturers and maintenance teams regularly update these procedures to improve efficiency, safety, and compliance with new aviation standards.
Whether these tests have changed recently would depend on the specific model of the aircraft, the engine type, and any new directives issued by aviation authorities like the Federal Aviation Administration (FAA) or the European Union Aviation Safety Agency (EASA). Manufacturers such as General Electric, Rolls-Royce, or Pratt & Whitney, may issue service bulletins and updates to these procedures which are then applied by airlines and maintenance facilities. It is crucial for operators to stay informed about these changes to ensure ongoing compliance and safety.
Changes might include updates to the software that analyzes the engine's performance, modifications to the test parameters to reflect new understanding of ice build-up characteristics, or revisions to the baseline data used for comparison during the HIT check. It's also possible that the introduction of new technology or materials would lead to an update of these procedures.