ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-1 (453-5002), C406-1HM (453-5003)
Page 58 of 67
Feb 28/2019
25-62-10
SUBTASK 25-62-10-450-002
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 25-62-10-450-001 on page 61.
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 25-62-10-410-803
9.
Helicopter Installations - Special Considerations
SUBTASK 25-62-10-990-001
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 at 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)
Artex does not recommend installing ELTs designed with a single-axis G-switch in helicopters due the
limitations and issues cited above.