Emergency Locator Transmitter (ELT) System - BITE Test

TASK 25-65-00-740-001-A
Emergency Locator Transmitter (ELT) System - BITE Test

ZONE: 200
FIN: 110MX ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE
261BC

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-42-400-002-A	Installation of the Ceiling Panels - Aft Utility Area
TASK 34-10-00-860-002-A	ADIRS Start Procedure
BITE Test - Component Location ** ON A/C NOT FOR ALL
BITE Test - Component Location ** ON A/C NOT FOR ALL
BITE Test - Component Location ** ON A/C NOT FOR ALL
BITE Test - Component Location ** ON A/C NOT FOR ALL
BITE Test - Component Location ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 25-65-00-861-051-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 25-65-00-861-051-K ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 25-65-00-010-051-A ** ON A/C NOT FOR ALL

B. Get access to the ELT 110MX
(1) Remove ceiling panel 261BC (Ref. AMM TASK 25-23-42-000-002).

Subtask 25-65-00-010-051-K ** ON A/C NOT FOR ALL

B. Get access to the ELT 110MX
(1) Remove the ceiling panel 261BC (Ref. AMM TASK 25-23-42-000-002).

Subtask 25-65-00-865-050-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ELT/NAV&A/C/IDENT	114MX	R14

4. Procedure
Subtask 25-65-00-860-050-F ** ON A/C NOT FOR ALL

A. Preparation for the BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

(1) In the cockpit:
(a) Prevent damage to the ELT electronics:

CAUTION: DO NOT DO AN ANNUNCIATOR LIGHT TEST DURING THE TEST OF THE EMERGENCY LOCATOR TRANSMITTER (ELT) SYSTEM. IF YOU DO, YOU CAN CAUSE DAMAGE TO AN INTERNAL RELAY OF THE ELT.

CAUTION: PULL THE TOGGLE SWITCH BEFORE YOU SET IT TO THE "ON", "OFF" OR "ARMED" POSITION. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE EMERGENCY LOCATOR TRANSMITTER.

1 On panel 25VU, make sure that the ANN LT switch (1) is not on the TEST position.
2 Put a WARNING NOTICE(S) on panel 25VU to tell persons not to set the ANN LT switch (1) to the TEST position during the BITE test.
(b) On Radio Management Panel (RMP1) 1RG1, set the frequency to 121.5 MHz as follows:
1 Set the ON/OFF switch (3) to the ON position.
2 Push the VHF1 pushbutton switch (4). The green LED on the VHF1 pushbutton switch (4) comes on.
3 Turn the dual selector-knob (2) until you can see the number 121.5 on the STBY/CRS display (7).
4 Push the double-arrow pushbutton switch (6).
5 The number 121.5 moves to the ACTIVE display (5).
(c) On Audio Control Panel (ACP) 2RN1, adjust the volume of the cockpit loudspeaker as follows:
1 Push the VHF1 rotary-pushbutton switch (8).
2 Turn the VHF1 rotary-pushbutton switch (8) clockwise to its maximum position.
(d) Make sure that there are no unwanted signals transmitted from the ELT during the BITE test.
(e) On remote control panel 111MX, make sure that the switch guard (20) is closed.
(2) In the cabin, on ELT 110MX, make sure that:

The ON/OFF/ARMED switch (11) is set to the OFF position.
The connector from remote control panel 111MX is connected to the connector (14) on the ELT with the adapter cable.
The antenna connector is connected to the ANT connector (13) and the connection is attached with adhesive (15).

Subtask 25-65-00-860-050-K ** ON A/C NOT FOR ALL

A. Preparation for the BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

(1) In the cockpit:
(a) Prevent damage to the ELT electronics:

CAUTION: DO NOT DO AN ANNUNCIATOR LIGHT TEST DURING THE TEST OF THE EMERGENCY LOCATOR TRANSMITTER (ELT) SYSTEM. IF YOU DO, YOU CAN CAUSE DAMAGE TO AN INTERNAL RELAY OF THE ELT.

CAUTION: PULL THE TOGGLE SWITCH BEFORE YOU SET IT TO THE "ON", "OFF" OR "ARMED" POSITION. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE EMERGENCY LOCATOR TRANSMITTER.

1 Make sure that on the panel 25VU the ANN LT switch (1) is not set to the TEST position during the BITE test.
(b) On the radio-management panel (RMP1) 1RG1, set the frequency to 121.5 MHz as follows:
1 Set the ON/OFF switch (3) to the ON position.
2 Push the VHF1 pushbutton switch (4). The green LED on the VHF1 pushbutton switch (4) comes on.
3 Turn the dual selector-knob (2) until you can see the number 121.5 on the STBY/CRS display (7).
4 Push the double-arrow pushbutton switch (6).
5 The number 121.5 moves to the ACTIVE display (5).
(c) On the audio-control panel (ACP) 2RN1, adjust the volume of the cockpit loudspeaker as follows:
1 Push the VHF1 rotary-pushbutton switch (8).
2 Turn the VHF1 rotary-pushbutton switch (8) clockwise to its maximum position.
(d) Make sure that there are no unwanted signals transmitted from the ELT during the BITE test.
(e) On the remote-control panel (RCP) 111MX, make sure that the switch guard (20) is closed.
(2) In the cabin on the ELT 110MX, make sure that:

The ON/OFF/ARMED switch (11) is set to the ARMED position.
The connector from the RCP 111MX is connected to the connector (14) by adapter cable on ELT.
The antenna connector is connected to the ANT connector (13), and the connection is locked with adhesive (16) and identified with paint (15).

Subtask 25-65-00-860-050-L ** ON A/C NOT FOR ALL

A. Preparation for the BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

(1) In the cockpit, prevent damage to the ELT electronics:

CAUTION: DO NOT DO AN ANNUNCIATOR LIGHT TEST DURING THE TEST OF THE EMERGENCY LOCATOR TRANSMITTER (ELT) SYSTEM. IF YOU DO, YOU CAN CAUSE DAMAGE TO AN INTERNAL RELAY OF THE ELT.

(a) On panel 25VU, make sure that the ANN LT switch (1) is not set to the TEST position during the BITE test.
(b) On radio-management panel (RMP1) 1RG1, set the frequency to 121.5 MHz as follows:
1 Set the ON/OFF switch (3) to the ON position.
2 Push the VHF1 pushbutton switch (4). The green LED on the VHF1 pushbutton switch (4) comes on.
3 Turn the dual selector-knob (2) until you can see the number 121.5 on the STBY/CRS display (7).
4 Push the double-arrow pushbutton switch (6).
5 The number 121.5 moves to the ACTIVE display (5).
(c) On audio-control panel (ACP) 2RN1, adjust the volume of the cockpit loudspeaker as follows:
1 Push the VHF1 rotary-pushbutton switch (8).
2 Turn the VHF1 rotary-pushbutton switch (8) clockwise to its maximum position.

NOTE: The cockpit loudspeaker must be adjusted to listen to the 121.5 MHz tone during the test.

(d) Make sure that you only hear the 121.5 MHz short test tone during the BITE test and no other unwanted signals which are transmitted from ELT 110MX.
(e) On remote-control panel (RCP) 111MX, make sure that the ON-ARMED-TEST/RESET switch (19) is set to the ARMED position.
(2) In the cabin:
(a) On ELT 110MX, make sure that:

The ON/OFF/ARM switch (11) is set to the OFF position.
The connector from RCP 111MX, or programming-dongle connector (25) 110MX-A (if installed) is connected to the RCP connector (14).
The antenna connector is connected to the ANT connector (13), and the connection is locked with adhesive (16) and identified with paint (15).

Subtask 25-65-00-860-050-R ** ON A/C NOT FOR ALL

A. Preparation for the BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

(1) In the cockpit:
(a) Prevent damage to the ELT electronics:

CAUTION: DO NOT DO AN ANNUNCIATOR LIGHT TEST DURING THE TEST OF THE EMERGENCY LOCATOR TRANSMITTER (ELT) SYSTEM. IF YOU DO, YOU CAN CAUSE DAMAGE TO AN INTERNAL RELAY OF THE ELT.

1 Make sure that on the panel 215VU the ANN LT switch (1) is not set to the TEST position during the BITE test.
(b) On the radio-management panel (RMP1) 1RG1, set the frequency to 121.5 MHz as follows:
1 Set the ON/OFF switch (3) to the ON position.
2 Push the VHF1 pushbutton switch (4). The green LED on the VHF1 pushbutton switch (4) comes on.
3 Turn the dual selector-knob (2) until you can see the number 121.5 on the STBY/CRS display (7).
4 Push the double-arrow pushbutton switch (6).
5 The number 121.5 moves to the ACTIVE display (5).
(c) On the audio-control panel (ACP) 2RN1, adjust the volume of the cockpit loudspeaker as follows:
1 Push the VHF1 rotary-pushbutton switch (8).
2 Turn the VHF1 rotary-pushbutton switch (8) clockwise to its maximum position.
(d) During the BITE test you can hear the 121.5 MHz signal transmitted from the ELT 110MX.
(e) On the remote-control panel (RCP) 111MX, make sure that:

The switch guard (20) is closed.
The ON-ARMED-TEST/RESET switch (19) is set to the ARMED position.

(2) In the cabin, on the ELT 110MX, make sure that:

The ON/ARM/TX switch (11) is set to the ARM position.
The electrical connector 110MX-A is connected to the connector (14).
The antenna connector 110MX-B is connected to the connector (13).

(3) Make sure that the Navigation Aircraft Identification-Module 144MX receives data (longitude - latitude). (Ref. AMM TASK 34-10-00-860-002)

Subtask 25-65-00-740-051-G ** ON A/C NOT FOR ALL

B. BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

NOTE: Two persons are necessary to do the BITE test.

(1) Do the test during the first five minutes after the hour, between XX:00 hours and XX:05 hours.

ACTION	RESULT
1.On ELT 110MX: Set the ON/OFF/ARM switch (11) to ARM. NOTE: The self-test mode is automatically set to 5 seconds. If the test result is unsatisfactory, do the test again three times.	At ELT 110MX: The buzzer operates during the full self-test procedure. The red indicator (12) flashes one time. When the test is completed, on the red indicator (12), one long flash confirms a satisfactory test result. NOTE: If the red indicator (12) shows a sequence of short flashes, the test result is unsatisfactory.
	On remote control panel 111MX: The ON/TEST indicator (18) flashes one time. After approximately 3 seconds, on the ON/TEST indicator (18), one long flash confirms a satisfactory test result. NOTE: If the ON/TEST indicator (18) shows a sequence of short flashes, the test result is unsatisfactory.
	On panel 108VU: ELT indicator 113MX comes on for 5 seconds.
	In the nose landing-gear well: Mechanic call horn 15WC operates for 5 seconds.
2.On remote control panel 111MX: Set the ON-ARMED-TEST/RESET switch (19) to TEST/RESET. NOTE: The ON-ARMED-TEST/RESET switch (19) automatically goes back to ARMED. The self-test mode is automatically set to 5 seconds. If the test result is unsatisfactory, do the test again three times.	On remote control panel 111MX: The ON/TEST indicator (18) flashes one time. After approximately 3 seconds, on the ON/TEST indicator (18), one long flash confirms a satisfactory test result. NOTE: If the ON/TEST indicator (18) shows a sequence of short flashes, the test result is unsatisfactory.
	On ELT 110MX: The buzzer operates during the full self-test procedure. The red indicator (12) flashes one time. When the test is completed, on the red indicator (12), one long flash confirms a satisfactory test result. NOTE: If the red indicator (12) shows a sequence of short flashes, the test result is unsatisfactory.
	On panel 108VU: ELT indicator 113MX comes on for 5 seconds.
	In the nose landing-gear well: Mechanic call horn 15WC operates for 5 seconds.

Subtask 25-65-00-740-051-J ** ON A/C NOT FOR ALL

CAUTION: PULL THE TOGGLE SWITCH BEFORE YOU SET IT TO THE "ON", "OFF" OR "ARMED" POSITION. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE EMERGENCY LOCATOR TRANSMITTER.

CAUTION: DO NOT DO THE EMERGENCY LOCATOR TRANSMITTER (ELT) TEST FOR LONGER THAN 50 SECONDS. IF YOU DO, THE ELT WILL SEND DISTRESS SIGNALS AND RESCUE OPERATIONS WILL START.

B. BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

NOTE: The BITE test operates for approximately 20 seconds. After this time, the ELT goes into waiting condition for a period of 30 seconds. During the waiting period, you can see and hear intermittently the visual indications and sounds on the ELT and ELT control panel. After this waiting period, the ELT transmits real distress signals.

If the BITE test stops before the test is completed, start the test again.

You need two persons to complete the BITE test.

(1) Do the test during the first five minutes after the hour, between XX:00 hours and XX:05 hours.

ACTION	RESULT
1.On the ELT:	On the ELT:
Set the toggle switch (11) to the ON position.	The LED (12) flashes two times. After 3 seconds, the LED (12) comes on and the buzzer operates for 6 seconds, which shows that the self-test is in operation. Then the LED (12) stays on for 10 seconds.
	At the cockpit loudspeaker: You can hear an emergency signal on the 121.5 MHz frequency. On panel 108VU: The ELT indicator 113MX comes on continuously. In the nose landing gear well: The mechanic call horn 15WC operates continuously.
After approximately 20 seconds and during 30 second waiting period: Set the toggle switch (11) to the OFF position and after 3 seconds, set it back to the ARMED position.	The visual indications and the sounds stop and the ELT returns to its normal ARMED state.
NOTE: The ARMED position is the usual position for the toggle switch. NOTE: If test results are unsatisfactory, do test up to three times again.
2.On remote control panel 111MX:	On remote control panel 111MX:
Make sure that the toggle switch (19) on the remote control panel is in the ARMED position.
To start the self-test, push the TEST/RESET button (17) until the LED (18) starts to flash. NOTE: For correct reset, it is necessary to push the TEST/RESET button for approximately 2 seconds. NOTE: If test results are unsatisfactory, do test up to three times again.	After two short blinks, make sure that the LED (18) light goes off for approximately 6 seconds. After the self-test, on the ELT: The LED (12) stays on continuously for 10 seconds. This shows correct operation of permanent illumination. At the cockpit loudspeaker: You can hear an emergency signal on the 121.5 MHz frequency. On the panel 108VU: The ELT indicator 113MX comes on continuously. In the nose landing gear well: The mechanic call horn 15WC operates continuously.
	After approximately 20 seconds, the visual indications and the sounds stop.

Subtask 25-65-00-740-051-K ** ON A/C NOT FOR ALL

CAUTION: DO THE TEST DURING THE FIRST FIVE MINUTES AFTER THE HOUR UTC (UNIVERSAL CO-ORDINATED TIME), BETWEEN XX:00 HOURS AND XX:05 HOURS. THIS IS TO PREVENT UNWANTED RESCUE OPERATIONS.

CAUTION: DO NOT DO THE EMERGENCY LOCATOR TRANSMITTER TEST FOR LONGER THAN 30 SECONDS. IF YOU DO, THE ELT WILL TRANSMIT DISTRESS SIGNALS AND RESCUE OPERATIONS WILL START.

B. BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

NOTE: You need two persons to complete the BITE test.

(1) If the BITE test stops before the test is completed, start the test again.

ACTION	RESULT
1.On the RCP 111MX, make sure that:
The toggle switch button (19) on the (RCP) 111MX is in the "ARMED" position. The three-position-switch (11) of the beacon (ELT) 110MX is in the "ARMED" position. Start the self-test from the RESET/TEST button (17) of the (RCP) 111MX until theacknowledgment blink on LED.	On the RCP 111MX: After two short blinks, do the check that the Remode Control Panel indicator (18) light comes "ON" for approximately 6s.
	After the self-test process, the LED shows: 10 seconds permanent illumination of the beacon LED for correct operation. 10 seconds flashing illumination of the beacon LED for incorrect operation.
	At the cockpit loudspeaker: You can hear an emergency signal on the 121.5 MHz frequency.
2.On the ELT 110MX:
Set the ARM/OFF/ON switch (11) to the OFF position and then back to the ON position.	On the ELT 110MX: The indicator (12) flashes two times and a delay of 3 s comes on. The buzzer of ELT sounds during 6 s.
	At the cockpit loudspeaker: You can hear an emergency signal on the 121.5 MHz frequency.
3.On the ELT 110MX:
Set the ARM/OFF/ON switch (11) to the ARM position.	On the ELT 110MX: The ELT is set back to the ARMED mode.

Subtask 25-65-00-740-051-P ** ON A/C NOT FOR ALL

B. BITE Test

BITE Test - Component Location ** ON A/C NOT FOR ALL

NOTE: You need two persons to complete the BITE test.

(1) Do the test during the first five minutes after the hour, between XX:00 hours and XX:05 hours.

ACTION	RESULT
1.On the RCP 111MX:	On the RCP 111MX:
Set the ON-ARMED-TEST/RESET switch (19) to the TEST/RESET position for not longer than two seconds, then back to the ARMED position.	The indicator (18) flashes three times.
	On the ELT 110MX: The indicator flashes three times. NOTE: If a NAIM 144MX with a NULL message protocol is installed, each indicator flashes four times.
	At the cockpit loudspeaker: You can hear the 121.5 MHz signal.
2.On the ELT 110MX:	On the ELT 110MX:
Set the ARM/OFF/TX switch (11) to the OFF position and then back to the ARM position.	The indicator flashes three times.
	On the RCP 111MX: The indicator (18) flashes three times. NOTE: If a NAIM 144MX with a NULL message protocol is installed, each indicator flashes four times.
	At the cockpit loudspeaker: You can hear the 121.5 MHz signal.

5. Close-up
Subtask 25-65-00-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install ceiling panel 261BC (Ref. AMM TASK 25-23-42-400-002).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 25-65-00-410-050-K ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the ceiling panel 261BC (Ref. AMM TASK 25-23-42-400-002).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 25-65-00-862-051-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 25-65-00-862-051-K ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 04:04:36 UTC