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Recalibration Guidelines: Aircraft Oxygen & Nitrogen Service Cart Gauges

March 19, 2012 by AERO Specialties

Questions often arise regarding gauge calibration regulations when servicing aircraft oxygen and nitrogen systems.  The Federal Aviation Administration (FAA) regularly conducts aircraft support equipment inspections and may impose monetary fines for using equipment with expired calibration certificates. Equipment that does not meet FAA guidelines can also be removed from service at the discretion of the FAA.  It often surprises customers that there is not an exact timetable or calibration cycle dates specified by the FAA for recalibration of oxygen and nitrogen service systems and their oxygen/nitrogen regulators and booster (intensifier) systems.

Most common industry and military standards determine the typical gauge calibration life cycle to be 6 to 12 months. The objective of gauge recalibration is to minimize out-of-tolerance conditions to an acceptable level. Consensus or organizational standards may be established at operations where no national standards exist. If no consensus standards have been established, the original equipment manufacturer (OEM) standards should be used. The proper way to establish the correct gauge recalibration frequency standard is to either examine the literature from the original equipment manufacturer to determine the stability of the gauge(s) and/or adhere to the standards set forth by your organization.  Ultimately it is the responsibility of the end user (owner) of the oxygen & nitrogen systems (or any aircraft servicing equipment) to determine the appropriate calibration interval under the requirements of its own quality management system.

Obviously, the potential issues that can arise from operating equipment that is past its re-calibration due date can be costly – through damage to the aircraft, danger to personnel (during tire servicing for example) or via the removal, “red tag” or quarantine of service equipment… Pressure gauges 12 months or older can be prone to experiencing out of tolerance conditions. Gauge degradation is inevitable over the lifetime of any gas pressure measuring instrument and gauge accuracy is properly ensured through periodic professional calibration.  The cost of such recalibration is relatively inexpensive, but can often surpass the total cost of purchasing new calibration certified gauges (labor costs, shipping costs, and equipment downtime add up in the long run).  For this reason, most customers choose to purchase new gauges in lieu of recalibration.

As always, we are more than willing to assist or answer any questions.  We provide new gauges and calibration services for customers on a daily basis.

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Boise, ID 83713 USA
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