ENSTROM 480B RFM SUPPLEMENT 3-1
FAA Approved: Dec 3/14 Rev. 1
Report No. 28-AC-049 Nov 12/14
CHAPTER 3. EMERGENCY PROCEDURES
3-1. General
1. If the SN3500 fails to operate or the display
indicates that the heading is invalid, use an alternate
heading source for primary heading information.
2. If the AHRS is inoperative or detects an internal
error, all SN3500 display outputs will be flagged. Use an
alternate heading source for primary heading information.
3-2. Electrical System Failure
1. A power interruption exceeding 30 seconds may
cause a loss of AHRS initialization. If a power interruption
occurs and the gyro flag appears, use an alternate heading
source for primary heading information.
2. In the event of complete electrical system failure,
use an alternate heading source for primary heading
information.
3-3. Primary Attitude Indicator Failure
CAUTION
If there is no ATTD IND switch located on the
instrument panel, the reversionary mode is
not enabled. Refer to external visual
references and other available information
for attitude information in the event the
attitude indicator fails to operate.
1. In the event the attitude indicator fails to operate,
revert to the SN3500 EHSI, Reversionary Mode, for
alternate attitude information.
a. Press the ATTD IND switch on the instrument panel
to activate the Reversionary Mode for attitude
display on the SN3500.
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