Becker AR4201 - Magnetic Compass Interference Test; Compass Interference Testing Procedure

Technical Instruction
Post Installation Test
Retrofit-Instructions Issue 01 November 2016 AR6201 17
4.2. Magnetic Compass Interference Test
• Check the interference of the magnetic compass in 30° steps over a full 360° turn.
• Record the found deviation from the aircraft compass deviation table after the AR6201
installation.
• At each step, keep the PTT button pressed for at least 5 seconds and see if the compass
reading is changing during this time.
• The maximum allowed deviation shall not exceed ±10°.
• A compass swing must be performed if deviation has been found out of tolerance.
Steer
Magnetic bearing
Deviation
old table
Deviation
found
Deviation
With TX
Max.
000 ±10°
030 ±10°
060 ±10°
090 ±10°
120 ±10°
150 ±10°
180 ±10°
210 ±10°
240 ±10°
270 ±10°
300 ±10°
330 ±10°