ENSTROM 480B RFM SUPPLEMENT 2-1
FAA Approved: Dec 3/14 Rev. 1
Report No. 28-AC-049 Nov 12/14
CHAPTER 2. NORMAL PROCEDURES
2-1. Starting Engine
Add the following steps to para. 2-19, “Starting Engine”,
after switching the avionics master switch ON:
1. The SN3500 will perform a power-on self-test and
display an introduction screen.
a. Verify the software version as listed in Table 1-1.
b. Verify the compass card display appears a few
seconds after the introduction screen.
2. Keep aircraft stationary during the AHRS
initialization period.
CAUTION
The aircraft should be stationary during the
AHRS initialization period. The initialization
may take up to three minutes after power is
applied.
2-2. Engine Runup
Add the following Check to step 11 of para. 2-20, “Engine
Runup”:
1. Check the gyro flag (GYRO INVALID) is removed
from the SN3500 heading display and the compass rose is
white after the initialization period.
2. Check the reversionary mode capability (if equipped)
by activating the ATTD IND switch. Ensure the display
information compares identically with the primary attitude
indicator. Press the ATTD IND switch again to return to
HSI mode.
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