ACR&Artex C406-2 HM - Manual (Page 76)

ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-2 (453-5000), C406-2HM (453-5001)
25-62-11
Page 76 of 87
JUN 20/13
SUBTASK 25-62-11-990-002
B. Recommendations
(1) ACR Electronics recommends installation of the C406-2HM ELT in helicopters. The C406-2HM
ELT is equipped with a 5-axis G-switch module in addition to the usual primary G-switch,
which is oriented to the direction of flight. See Figure 26.
Figure 26 ELT Orthogonal Axes
(2) The six-axis coverage of the C406-2HM design accommodates the flight characteristics of
helicopters, while allowing “normal” installation and eliminating or significantly reducing
“nuisance” ELT activations.
SUBTASK 25-62-11-410-001
C. Orientation
(1) Mount the C406-2HM ELT parallel to the waterline of the fuselage, along the longitudinal axis,
with the direction-of-flight arrow on the ELT pointing forward. See Figure 27.
NOTE: This is the orientation of the primary G-switch in the ELT.
(2) The ELT may be angled downward as much as 25°, if necessary.
NOTE: Keep in mind the steeper the mounting angle, the more pre-load on the primary G-
switch and the increased likelihood of “nuisance” activations.
(3) All other installation requirements contained herein are applicable and must be adhered to.
Figure 27 Orientation of ELT for Helicopter Installations
+Y
-Y
-X
+X
+Z
-Z
FWD
0° TO 25°
FLIGHT