Air Data Unit Calibration
Aviation air data units (ADUs) are critical components that measure pitot airspeed and barometric altitude in fixed-wing aircraft. When an ADU requires repair, several steps are typically followed:
Diagnosis and Inspection:
-
-
-
- The faulty ADU is removed from the aircraft.
- Technicians inspect the unit for visible damage, loose connections, or signs of wear.
- They check the internal components, such as sensors, circuit boards, and wiring.
-
-
Calculating Airspeed:
-
-
- The difference between dynamic pressure (from the pitot tube) and static pressure (from the static ports) is the pitot-static pressure differential.
- This differential pressure is used to calculate the aircraft’s airspeed.
- The airspeed indicator in the cockpit displays this calculated value.
-
Component Replacement:
-
-
-
- Defective sensors, transducers, or electronic components are replaced.
- Damaged wiring or connectors are repaired or replaced.
- If necessary, the ADU’s memory or firmware may be updated.
-
-
Sealing and Enclosure:
-
-
- The repaired ADU is sealed to protect it from moisture, dust, and other environmental factors.
- Proper sealing ensures long-term reliability.
-
Functional Testing:
-
-
-
- The ADU is reinstalled in the aircraft.
- Technicians perform ground tests to verify that it operates correctly.
- Airspeed and altitude readings are cross-checked with other instruments.
-
-
Documentation and Certification:
-
-
- Detailed records are kept, documenting the repair process.
- The ADU is certified as airworthy before returning to service.
-
