ACR&Artex C406-2 HM - Manual (Page 75)

25-62-11
Page 75 of 87
JUN 20/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-2 (453-5000), C406-2HM (453-5001)
SUBTASK 25-62-11-450-002
B. New Battery Installation
CAUTION: DO NOT USE CONTACT CLEANER ON ELT COMPONENTS. SUCH CHEMICAL AGENTS
CAN BE HIGHLY DESTRUCTIVE TO THE MOUNTING HARDWARE AND ELT HOUSING,
CAUSING CRACKING, FRACTURING AND OTHER DAMAGE.
(1) This subtask applies to installation of a new (i.e., replacement) battery.
(2) Verify the bottom of the ELT is clean and free of battery corrosion residue. Clean as
necessary.
(3) Remove the paper backing from the rubber seal at the connector end of the battery pack.
(4) Perform the procedure outlined in SUBTASK 25-62-11-450-001 on page 74.
(5) Place a new battery expiration date label on the ELT mounting frame cap or other visible
location.
NOTE: The new label is supplied with the new battery pack.
(6) Enter the pertinent battery replacement information in the logbook (i.e., aircraft records) and
fill out any other required documentation.
TASK 25-62-11-410-803
9. Helicopter Installations - Special Considerations
SUBTASK 25-62-11-990-001
A. Background
(1) There are few guidelines, aside from experience, regarding the best way to mount an ELT in
helicopters.
(2) Before the availability of multi-axis G-switch modules, manufacturers advised installing ELTs
with the sensitive axis pointing approximately 45° downward from the normal forward
direction of flight.
(a) This mounting attitude was adapted due to a combination of the directional sensing
limitations of a single-axis G-switch and the flight characteristics of helicopters.
(b) Mounting the ELT in this attitude and orientation is currently specified by CAR, Part 5,
Subpart 551.104.
(c) Experience has indicated this mounting angle tends to preload the G-switch and
“nuisance” activation can occur as a result of severe aircraft maneuvers, and abrupt
takeoffs and landings.
(3) ACR Electronics does not recommend installing ELTs designed with a single-axis G-switch in
helicopters due the limitations and issues cited above.