Final answer:
The Static Defect Correction Module (SDCM) serves to correct static pressure errors in order to provide accurate readings for aeroplanes' altimeters and airspeed indicators, which are vital for safe flying operations.
Step-by-step explanation:
The purpose of the Static Defect Correction Module (SDCM) is to correct static pressure errors. Static pressure is crucial for accurate reading of aircraft instrumentation, such as altimeters and airspeed indicators. Airplanes are equipped with static ports, but sometimes these ports can be affected by aerodynamic forces, which lead to inaccurate readings. The SDCM measures the static pressure and then applies a correction factor to ensure that the pressures used by the aircraft's instruments reflect the true ambient atmospheric pressure outside the aircraft. This helps the pilot maintain proper altitude, airspeed, and is important for safe navigation and landing procedures.