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ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
03/22/04 PAGE 3-7
(1.6 cm)
(19.7 cm)
(7.7 mm)
(1.6 cm)
(1.43 mm)
(5.8 mm)
(11.4 mm)
(21 cm)
(15.2 cm)
(7.62 cm)
(2.95 cm)
(3.8 cm)
(3.2 cm) (4.1 cm)
(1.9 cm)
(.6 kg)
(7.62 mm) (5.1 mm)
(5.72 cm)
FIG URE 3-5 BLADE AN TENNA (110-340) OUT LINE
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
03/22/04 PAGE 3-8
MACH 1
(.36 kg)
(9.65 cm)
(1.27 cm)
(12.5 cm)
(6.1 cm)
(3.0 cm)
(5.1-5.3 mm)
(2.3 cm)
(9.65 cm)
FIG URE 3-6 BLADE AN TENNA (110-341) OUT LINE
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
03/22/04 PAGE 3-9
FIG URE 3-7 ROD/WHIP AN TENNA (110-343) OUT LINE
· “The mounts shall have max i mum
static lo cal de flec tion no greater than
2.5 mm(0.1in) when a force of 450
newtons (100lbs) is ap plied to the
mount in the most flex i ble di rection. De -
flec tion mea surements shall be made
with ref erence to an other part of the air -
frame not less than 0.3 me ters (1 foot)
nor more than 1.0 me ters (3 feet) from
the mount ing lo cation.”
· In ad dition, RTCA Doc ument Num ber
DO-182 rec om mends that “all ELT sys -
tem com po nents which must sur vive a
crash in tact, ....should be at tached to
the air frame in such a man ner that the
attachment sys tem can sup port a 100g
load...in the plus and mi nus di rec tions of
the three prin cipal axes of the air craft.”
· Fur ther in stal la tion guid ance can be
found in FAA Ad vi sory Cir cular
43.13-2A (Ac cept able Methods, Tech -
niques and Prac tices - Air craft Al ter -
ations). Chap ter 2, para graph 28 deals
specifically with Emer gency Trans mitter
installations.
Mount the ELT unit hor i zon tally so
that the ri gid ity re quirements are met
and the ar row on the mount ing tray is
aligned within 10 de grees of the lon gi -
tu di nal axis of the air craft and pointed
in the di rection of flight. Re fer to page
3-20 & Fig ure 3-13 for he licopter in -
stallations.
Re fer to Fig ures 3-3 and 3-3A for
out line di men sions and the view of
the in stal la tion con figuration.
Finally, in se lect ing a lo cation for the
ELT in stallation, the fol lowing cau -
tionary ad vice should be taken into
con sid er ation:
3.2. An tenna Mount ing Lo -
ca tions
Locate a po si tion where the an tenna
can be in stalled VER TI CALLY (up to
15° off the ver tical plane is ac cept -
able) with at least 30 inches clear -
ance from other an tennas (es pe cially
VHF) mounted on the air craft. Mount -
ing the ELT an tenna in close prox im -
ity to other an tennas may re sult in
false ELT ac ti va tions or other in ter fer -
ence.
The coax ca ble should not cross any
pro duc tion breaks (ma jor struc tural
sec tions) in the air craft so that in the
event of a crash the ELT and the
an tenna are in same air craft sec tion.
This usu ally re quires plac ing the an -
tenna di rectly above the ELT unit. Do
not bun dle the ELT an tenna coax
with any other VHF ra dio coax, power
har ness or the ELT re mote switch
har ness.
If the ELT trans mitter and ex ternal
an tenna are on op posite sides of an
air frame pro duc tion break, the com po -
nents should be se cured to each
other by a tether which can sup port
a 100 G load (ELT weight x 100).
The in terconnecting an tenna-to-ELT
coax ca ble should have suf fi cient
slack on both ends that it will not be
sub jected to any ten sile load and
should be tied loosely to the tether.
ARTEX AIRCRAFT SUPPLIES DOCUMENT #570-5060
CAU TION:
Avoid lo cat ing the ELT where it will be sub -
jected to un pro tected ex posure to harsh
chemical flu ids such as deicing com pounds.
They can pro mote crack ing and frac turing of
the ELT mount ing frame and hous ing com -
ponents by de grad ing and weak en ing the
structural in tegrity of the hous ing and tray
material. These same chem ical agents can
also cause cor rosion on elec trical con nec -
tions.
03/22/04 PAGE 3-10
Use only the ARTEX ap proved an ten -
nas. The ELT will not op er ate prop erly
with out be ing con nected to the an -
tenna for which it was de signed.
FAA Ad vi sory Cir cu lar 43.13-2A, Chap -
ter 3, para graphs 36 through 38 pro -
vides ad di tional guid ance for an tenna
installations.
3.3. Installing the Mount ing
Tray
　
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