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around the wires en tering the rear of
the 9-pin con nec tor 151-5009 (re fer to
Figure 3-11).
En sure each of the en try holes are
filled with RTV. This will pre vent wa -
ter from bead ing up and caus ing pos -
si ble bridg ing be tween con nec tor pins
which could re sult in false ac ti va tion
of the ELT.
3.9. He li cop ter In stal la tions
The pri mary con sideration to re mem -
ber is that RTCA 168 (“Min i mum Per -
for mance Stan dards - Emer gency
Lo ca tor Trans mit ters”) para graph 2.3.1
states that the pri mary sen sor (Delta
V switch in the case of the ARTEX
ELTs) is in tended to re spond to crash
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
03/22/04 PAGE 3-20
ac cel er a tions par al lel to or co in ci den tal
with the lon gitudinal axis of the air -
craft, mov ing gen erally in a for ward
direction.
There are few guide lines, aside from
experience, as to the best way to in -
stall an ELT in a he licopter. The man -
ufacturers have tra ditionally ad vised
installing the ELT at a 45 de gree an -
gle rel ative to the lon gitudinal plane of
the he licopter. This was as sumed to
be the best mount ing po sition given
the unique flight char ac ter is tics of he li -
copters.
Experience has shown, how ever, that
the mount ing an gle tends to preload
the G force level on the G-switch.
The Delta V switch is re quired by
TSO C91a to be far more sen sitive
and ac ti vate at a sig nificantly lower
sustained G force than older TSO
C91 ELTs. ARTEX has found that in
many cases the 45 de gree mount ing
an gle can re sult in false ac tivation of
the ELT de pend ing on the type and
severity of the air craft ma neuvers. The
same can be true of abrupt take offs
and land ings.
While the C406-N may be in stalled
in a he li cop ter ARTEX highly rec om -
mends use of the C406-N HM for
helicopter in stallations. These ELT’s
were es pecially de signed for ro tary air -
craft and con tain an ad di tional five
G-Switch mod ule in ad dition to the
pri mary crash sen sor. This fea ture al -
lows for six axes of cov er age.
ARTEX rec om mends that when in stall -
ing a C406 se ries ELT when ever
pos si ble, the ELT should be mounted
par al lel with the floor as shown in
Figure 3-13. If space con straints do
not per mit mount ing the ELT par allel
with the floor, the ELT may be tilted
for ward as much as 25 de grees. The
di rec tion of flight ar row on the ELT’s
prod uct la bel rep re sents the di rec tion
in which the pri mary crash sen sor is
ori ented.
NOTE FOR CA NA DIAN
IN STAL LA TIONS:
The Ca nadian op er at ing rules/stan -
dards 551.104(c)(2)(ii) re quire that,
when in stalled in a he li cop ter, the
ELT shall be in stalled with its sen si -
tive axis tilted 45°. De vi a tions from
this re quire ment must be ap proved by
Trans port Can ada.
NOTE: In stal la tion in a pres sur ized
air craft con sti tutes a ma jor mod i fi ca -
tion, con sult the De part ment of Trans -
por ta tion Re gional Of ficer be fore
pro ceed ing.
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
03/22/04 PAGE 3-21
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
03/22/04 PAGE 3-22
C
FLIGHT
00 TO 250
FIG URE 3-13 ELT HELICOPTER INSTALLATION
ARTEX AIRCRAFT SUPPLIES DOCUMENT # 570-5060
05/12/03 PAGE 4-1
PE RI ODIC MAIN TE NANCE
4.1. In the United States
WHY? To en sure con tin ued re li abil ity of
your ELT it must be in spected for dam -
age and wear which could be caused by
age, ex posed el ements, vi bra tions, etc.
Even the best de signed equip ment, if not
properly main tained and cared for, will
eventually fail.
HOW OFTEN? At least once ev ery year,
un less re quired more fre quently by FARs
(e.g., 100 hour in spections)
IS IT RE QUIRED? FAR Parts 91.207,
91.409 and 43 Ap pendix D make de tailed
ELT in spec tions man da tory.
HOW DE TAILED? FAR 43, Ap pen dix
D(i) states in part that each per son per -
forming an an nual or 100-hour in spection
shall in spect the fol lowing com ponents of
(the ELT):
(1) (ELT unit and mount) for im proper
installation and in se cure mount ing.
(2) Wiring and con duits - for im proper
routing, in secure mount ing, and ob vious
defects.
(3) Bonding and shield ing - for im -
proper in stallation and poor con di tion.
(4) An tenna, in clud ing trail ing an -
tenna-for poor con di tion, in secure mount -
　
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