be made with reference to another part of the airframe not less than 0.3 meter (1 foot) nor
more than 1.0 meter (3 feet) from the mounting location.
After selecting a suitable location
meeting all of the above requirements. Drill and mount the ELT tray assembly as shown in
Fig 3. A doubler plate may be required. Secure latches with tie wrap as shown.
IMPORTANT
The quick release retaining straps which secure the ELT to the tray are slightly different in
size. The strap that fits around the front of the ELT, (transmitter assembly) is marked
“front.” The strap that fits around the battery case end of the ELT, is marked “Battery.”
Helicopter installation
The model E-04 ELT is suitable for helicopter installation. The procedures for installation,
maintenance, and operation, are the same as for fixed wing aircraft, except for the orienta-
tion of the ELT in relation to the helicopter longitudinal axis. The arrow on the battery case
of the ELT should be pointed in the normal direction of forward flight. The longitudinal axis
should be aligned - 10 degrees of the longitudinal axis horizontally, and at a 45
degree downward angle as shown in Fig 2.
3
SECTION 3 ANTENNA INSTALLATION
In order to meet the requirements of COSPAS/SARSAT TSO C-126b,TSO C-91a, and FAR
91.207 an approved antenna must be used. The antenna supplied with the ELT P/N E-04.8 is
a monopole, dual frequency antenna design. It has a recommended operating speed of up
to 260 knots. We have a high speed blade antenna avalible, part number S65-1231-1 which
is rated to Mach 1.0. Other antennas may be used provided they meet the minimum VSWR
requirements as noted in the specifications section of this manual, (Section 15) and meet
COSPAS/SARSAT approval for use with the model E-04 ELT. The coaxial cable supplied is
RG-58, and is 5 feet long. A longer or shorter cable may be fabricated using RG-58 or
equivalent cable, and Amp 227079-5 connectors. The insertion loss of the cable assembly
at 406 MHz should not exceed 2 dB. At 121.5 MHz the insertion loss should not exceed 3
dB. The cable should be a minimum of 2 feet in length.
