RTCA DO-160 – Section 15.0 – Magnetic Effect

This test determines the magnetic effect of the equipment and is mainly intended for finding or proving the closest distance to compasses or compass sensors (flux gates) at which that unit is allowed to be installed.
This test ensures that equipment can operate properly without interference which may affect the nearby equipment, determining equipment compliance with the applicable equipment performance standard or assisting the installer in choosing the proper location of the equipment in the aircraft.

 
Test Description
The magnetic effect of the equipment shall be determined in terms of the equivalent deflection of a free magnet in a uniform magnetic field (as produced by the earth) having a horizontal intensity of 14.4 A/m ±10% when the equipment under test is positioned on the east-west line through the pivot of a magnet.
This measurement may be performed with either an uncompensated compass or an equivalent magnetic sensor.

 
Category Y: D = 0.0 m. The deflection of the compass is ≤1˚ when measured immediately adjacent to the equipment. This category should be used for equipment whose installation is placed between 0.0 m and 0.3 m from the magnetic compasses or flux gates.
Category Z: 0< D ≤ 0.3 m. The deflection of the compass is equal to 1˚ when measured >0.0 m to ≤0.3 m to the equipment. This category should be used for equipment whose installation is ≥ 0.3m to magnetic compasses or flux gates.
Category A: 0.3< D ≤ 1 m. The deflection of the compass is equal to 1˚ when measured >0.3 m to ≤1.0 m to the equipment. This category should be used for equipment whose installation is ≥ 1 m to magnetic compasses or flux gates.
Category B: 1 m < D ≤ 3 m The deflection of the compass is equal to 1˚ when measured >1.0 m to ≤3.0 m to the equipment. This category should be used for equipment whose installation is ≥3 m to magnetic compasses or flux gates.
Category C: The deflection of the compass is equal to 1˚ when measured >3.0 m to the equipment. This category should be used for equipment whose installation is >3 m to magnetic compasses or flux gates. Minimum distance for deviation of 1˚ shall be reported in the test form; the equipment location on board will be selected accordingly.

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RTCA DO-160 Section 15.0 Magnetic Effects Testing

The RTCA DO-160 magnetic effects test standard determines the magnetic effect of aircraft equipment. RTCA/DO-160G testing is mainly intended for finding or proving the closest distance to compasses or compass sensors (flux gates) at which that unit is allowed to be installed. The DO-160G magnetic effects test ensures that equipment can operate properly without interference. This interference can be detrimental as it can affect nearby equipment.

The magnetic effects of the equipment are determined in relation to the equivalent deflection of a free magnet in a uniform magnetic field. This is based on the field produced by the earth. This field has a horizontal intensity of 14.4 A/m ±10% when the equipment is positioned on the east-west line through the pivot of a magnet. RTCA DO-160 magnetic field compliance testing measurements may be performed with either an uncompensated compass or an equivalent magnetic sensor.

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RTCA DO-160 Mag Effects Test Equipment Categories:

The DO-160G Section 15 test standard specifies five categories of equipment. Please note that D is the distance at which the 1-degree (1˚) deflection is observed.

Equipment Category A: 0.3< D ≤ 1m

The deflection of the compass is equal to 1˚ when measured >0.3m to ≤1.0 m to the equipment. This category should be used for equipment whose installation is ≥ 1m to magnetic compasses or flux gates. Equipment meeting this description must undergo RTCA DO-160G magnetic effects testing.

Equipment Category B: 1m < D ≤ 3m

The deflection of the compass is equal to 1˚ when measured >1.0m to ≤3.0 m to the equipment. This category should be used for equipment whose installation is ≥3m to magnetic compasses or flux gates. Equipment meeting this description must undergo RTCA DO-160G mag effects testing.

Equipment Category C:

The deflection of the compass is equal to 1˚ when measured >3.0 m to the equipment. This category should be used for equipment whose installation is >3m to magnetic compasses or flux gates. Minimum distance for deviation of 1˚ shall be reported in the test form; the equipment location onboard will be selected accordingly. Equipment meeting this description must undergo RTCA DO-160G magnetic effects tests.

Equipment Category Y: D = 0.0m.

The deflection of the compass is ≤1˚ when measured immediately adjacent to the equipment. This category should be used for equipment whose installation is placed between 0.0m and 0.3m from the magnetic compasses or flux gates. Equipment meeting this description must be tested at an RTCA-DO-160 magnetic effects test lab.

Equipment Category Z: 0< D ≤ 0.3m.

The deflection of the compass is equal to 1˚ when measured >0.0m to ≤0.3m to the equipment. This category should be used for equipment whose installation is ≥ 0.3m to magnetic compasses or flux gates. Equipment meeting this description must be tested at an RTCA DO-160G mag effects testing lab.

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