Technical data

13773-001
25-60
Page 330 Nov 2000
(k) Install baggage compartment carpet. (Refer to 25-50)
(3) Inspection Check - ELT
For inspection of the ACK model E-01 ELT, refer to the ACK Technologies Installation and Oper-
ation Manual (manual number 9/94).
(a) Remove ELT from the mount and inspect the mounting tray to ensure all fasteners and
mechanical assemblies are secure.
(b) Inspect the coaxial cable connecting the ELT to the antenna for cuts or abrasions on its
outer jacket. Disconnect the BNC connectors on each end. Examine both the BNC con-
nectors and the mating plug on the antenna and ELT unit for any signs of corrosion.
(c) Inspect the modular cable connecting the ELT to the RCPI unit to for signs of wear or
abrasion on the outer jacket. Remove the modular plug connecting the ELT to the con-
necting cable and inspect the jack and plug assembly for corrosion.
(d) Visually inspect and confirm proper seating of all connector pins. Special attention should
be given to coaxial center conductor pins which are prone to retracting into the connector
housing.
(e) Gain access to the ELT and RCPI batteries and inspect. No corrosion should be detect-
able. Verify that the batteries are approved (Duracell MN1300 for the ELT and Duracell
PX28L or Kodak K28L for the RCPI) and check the expiration date. Replace if necessary.
(See Figure 25-601) (Refer to 5-30)
(f) Activate the ELT using applied force. The direction for mounting and force activation is
indicated on the ELT.
(g) Verify that the ELT has been activated by the use of a wattmeter, or the airplane's VHF
radio communications receiver (when tuned to 121.5 Mhz).
Note: The aforementioned procedure is not a measured check, it only indicates
that the G-switch is working.
WARNING:
The ELT must be mounted with the arrow (which is printed on the bat-
tery case) pointing in the direction of flight.
Note: The quick release retaining straps which secure the ELT to the tray are
slightly different size. The strap which fits around the front of the ELT (trans-
mitter assembly) is marked FRONT. The strap which fits around the battery
case end of the ELT is marked BATTERY.
(h) Reinstall ELT into its mount and verify the proper direction for crash activation.
(i) Reconnect all cables to allow slack at each end and be properly secured to the airplane
structure for support and protection.
(j) Activate the ELT using the ON or TEST switch. A low-quality AM broadcast radio receiver
should be used to determine if energy is being transmitted from the antenna. When the
antenna of this radio (tuning dial on any setting) is held about six inches from the activated
ELT antenna, the ELT aural tone will be heard.
Note: The aforementioned procedure is not a measured check, but it does provide
confidence that the antenna is radiating with sufficient power to aid search
and rescue. The aircraft’s receiver, tuned to 121.5 Mhz, may also be used.
This receiver however is more sensitive and could pick up a weak signal
even if the radiating ELT’s antenna is disconnected. Thus, it does not check
the integrity of the ELT system or provide the same level of confidence as
does an AM radio.