Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 198 / 881

3. Disconnect antenna coaxial cable from ELT.
4. Disconnect wiring harness connector from ELT.
5. Remove ELT from its mounting tray.
6. Remove 8 flat head screws from unit. (Refer to Figure 23-6.)
7. Carefully separate unit into two sections.
8. Unsnap battery connector (connector toward back end of circuit board). (Refer to Figure 23-6.)
9. Carefully remove battery pack (contained in white foam jacket) from the ELT.
10. Cut tape holding the two halves of foam together and remove old battery pack.
11. Install new battery pack in foam jacket. Tape foam halves together with a good quality glass filament
tape.
12. Install battery pack assembly into ELT. Plug connector into circuit board.
13. Slide the two unit section together. Ensure red gasket in header is sitting flat.
14. Secure with 8 new screws provided with replacement battery. Ensure all 8 screws are snugged up.
15. Install ELT into tray in airplane.
16. Perform ELT unit operational check. (Refer to Testing Emergency Locator Transmitter.
17. Install access panel.
Figure 23-5. Narco ELT 910 Emergency Locator Transmitter Schematic (S/N's 4495008 and up)
TESTING EMERGENCY LOCATOR TRANSMITTER.
— NOTE —
Consult FAA Advisory Circular AC 20-81 for detailed testing
information and precautions
1. Conduct test only during the first five minutes after any hour.
2. If operational test must be made at any time other than the first five minutes after the hour, notify the
nearest FAA traffic Control Tower or Flight Service Station prior to the test.
3. Test should be no longer than three audio sweeps.
4. If the antenna is removed, a dummy load should be substituted during the test.
A. Remove access panel aft of fuselage station 247.00 to gain access to transmitter.
B. Turn aircraft master switch ON. Turn the aircraft communications receiver ON and tune to 121.5
mHz.
PIPER AIRCRAFT
PA-44-180/180T
AIRPLANE MAINTENANCE MANUAL
23-14-00
Page 23-05
Revised: June 20, 1995
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TERMINAL
20B
+14 VDC
P203
ELT 910
ELT
REMOTE
SWITCH
J501
F1
1/2 A
20R
20R
ELT
SW
PWR
BUS
ELT SW PWR
GND