Garmin G5 Installation Manual page 145

NOTE
It is important that all actions are carried out in the order and at the precise elapsed
time as specified in the prepared test sequence.
6. After the "Begin test sequence" appears, wait approximately five seconds and perform
each of the actions listed in the test sequence table. Refer to Section C.3 for an example
of a test sequence.
7. When the test sequence is completed, wait approximately five seconds and then select
"Done" to complete the test.
The G5 informs the operator if the installation has passed or failed the magnetometer
interference test. The results displayed indicate the worst case percentage of limit and the time
at which it occurred. If the test passes, no further action is required.
If the test fails, the installation should be considered unreliable until the source of magnetic
interference is identified and remedied. The magnetometer interference test must be repeated
until passed. When the magnetometer interference test fails, record the magnetometer
maximum deviation value and its corresponding timestamp. Compare the corresponding
timestamp with the prepared test sequence to identify which action produced the problem.
Two common reasons for a failed magnetometer interference test are:
1. New equipment is installed in close proximity to the GMU 11 magnetometer.
2. An existing or new electronic device has become grounded through the aircraft
structure instead of via the proper ground wire in a twisted shielded pair, especially if
the ground return path through the aircraft structure passes near the GMU 11.
6.3.8.4 Initial Power On Checks
1. Apply power to the aircraft and aircraft systems and allow the aircraft systems to
initialize.
2. On the G5 Attitude display, verify the following;
•
No red-X's displayed
•
Attitude display
•
Heading display (if interfaced to a GMU 11) Ground Track display (if not
interfaced to a GMU 11)
•
Airspeed Tape (Digital read out will be dashes)
•
Altitude Tape (Digital readout should be reasonable to field elevation)
•
Ground speed field
•
Slip skid display
•
Current track bug
•
Barometric Pressure setting field
3. On the G5 HSI display, verify the following;
•
No red-X's displayed
•
Heading/ Ground Track display
o Heading Display - if interfaced to a GMU 11, indicated by white numbers
indicating magnetic heading.
Garmin G5 Electronic Flight Instrument Part 23 AML STC Installation Manual
Page 145
190-01112-10
Rev. 9