Functional (BITE) Test

TASK 28-46-00-740-001-A
Functional (BITE) Test

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

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	ACCESS PLATFORM 3M (10 FT)
No specific	AR	SAFETY BARRIER(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
622KB
192MB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 28-00-00-910-001-A	Fuel Safety Procedures
TASK 31-32-00-860-001-A	Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page

3. Job Set-up
Subtask 28-46-00-941-056-A

A. Safety Precautions

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

(1) You must obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-46-00-860-050-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 28-46-00-010-055-C ** ON A/C NOT FOR ALL

C. Get Access
(1) If it is necessary to do a test of the high-level sensors 17QJ1(17QJ2), 20QJ and the dummy load sensor 6QJ:

put the ACCESS PLATFORM 3M (10 FT) below zone 622
open the access door 622KB to energize the refuel/defuel control panel.

NOTE: If operating in battery power, do not keep the door open longer than necessary because the battery can discharge.

Subtask 28-46-00-010-055-E ** ON A/C NOT FOR ALL

C. Get Access
(1) If it is necessary to do a test of the high-level sensors 17QJ1(17QJ2), 20QJ and the dummy load sensor 6QJ:

open the access door 192MB to energize the refuel/defuel control panel.

NOTE: If operating in battery power, do not keep the door open longer than necessary because the battery can discharge.

Subtask 28-46-00-650-053-A

D. Fuel Configuration
(1) If it is necessary to test the center tank low-level sensors 21QJ and 22QJ, refuel the center tank to a minimum 650 kg (1440 lb) (Ref. AMM TASK 12-11-28-650-003).

4. Procedure
Subtask 28-46-00-740-051-F ** ON A/C NOT FOR ALL

A. BITE Test
(1) Do this test:

NOTE: The subsequent results are only available after two minutes from the time that you energized the Fuel Quantity Indication Computer (FQIC).

ACTION	RESULT
1.On the MCDU, get access to the FUEL page (Ref. AMM TASK 31-32-00-860-001).	The MCDU shows the FUEL menu.
2.Push (in) the line key adjacent to <COMMAND FLSS BITE indication.	The MCDU first shows: FLSS BITE RESULTS AVAILABLE WITHIN 150s within 150 seconds, the MCDU shows: Refer to Table 1 for FLSS COMMAND BITE results
3.Push (in) the line key adjacent to <RETURN indication.	The MCDU shows the FUEL menu.
4.Push (in) the line key <RETURN frequently until the CFDS menu page is shown.

EQUW CH1 FUEL FLSS STATUS

-------------------------------------------------------------------------------

! LFT CTR RHT !

! SURGE P - P !

! HI LEVEL P P* P* !

! LO LEVEL 1 F P* F !

! LO LEVEL 2 P* - P !

! LOGIC P - P !

! U/FULL A P* - P* !

! U/FULL B&C P - P !

! * = PREVIOUS RESULTS !

!-----------------------------------------------------------------------------!

! Table 1 !

! FLSS COMMAND BITE Results Displayed on MCDU !

-------------------------------------------------------------------------------

NOTE: The letter P indicates that all sensors in that group are serviceable.

NOTE: The letter F indicates that one or more sensor(s) in that group are unserviceable.

NOTE: Where an asterisk (*) is shown, the results from the last related BITE test are given.

NOTE: The FLSS COMMAND BITE indication shown in Table 1 are for example only.

Subtask 28-46-00-740-051-G ** ON A/C NOT FOR ALL

A. BITE Test
(1) Do this test:

NOTE: When you push (in) the line key adjacent to FUEL> indication, the Multipurpose Control and Display Unit (MCDU) can initially show CH1 or CH2. In this case, the test starts with CH1. CH2 will only show first if CH1 has a failure.

NOTE: The subsequent results are only available after two minutes from the time that you energized the Fuel Quantity Indication Computer (FQIC).

ACTION	RESULT
1.On the MCDU, get access to the FUEL page (Ref. AMM TASK 31-32-00-860-001).	The MCDU shows the first CH1 FUEL menu.
2.Push (in) the NEXT PAGE button on the MCDU.	The MCDU shows the second CH1 FUEL menu.
3.Push (in) the line key adjacent to <COMMAND FLSS BITE indication.	For CH1, the MCDU first shows: IN PROGRESS (ICTV'S NOT TESTED) after approximately 5 seconds, the MCDU shows: NO FAULTS
4.Push (in) the line key adjacent to <RETURN indication.	The MCDU shows the second CH1 FUEL menu.
5.Push (in) the NEXT PAGE button on the MCDU.	The MCDU shows the first CH1 FUEL menu.
6.Push (in) the line key adjacent to <SELECT CHANNEL 2 indication.	The MCDU shows the first CH2 FUEL menu.
7.Push (in) the NEXT PAGE button on the MCDU.	The MCDU shows the second CH2 FUEL menu.
8.Push (in) the line key adjacent to <COMMAND FLSS BITE indication.	For CH2, the MCDU shows: FLSS TEST NOT AVAILABLE ON THIS CHANNEL < SELECT CHANNEL 1
9.Push (in) the line key <RETURN frequently until the CFDS menu page is shown.

Subtask 28-46-00-740-051-H ** ON A/C NOT FOR ALL

A. BITE Test
(1) Do this test:

NOTE: The subsequent results are only available after two minutes from the time when you energized the Fuel Quantity Indication Computer (FQIC).

ACTION	RESULT
1.On the MCDU, get access to the FUEL page (Ref. AMM TASK 31-32-00-860-001).	The MCDU shows the CH1 FUEL menu.
2.Push (in) the line key adjacent to <COMMAND FLSS BITE indication.	The MCDU first shows the message IN PROGRESS. If there is(are) no fault(s): After approximately 150 seconds, the MCDU shows the message NO FAULTS. If the correct conditions for the BITE test are not set, the MCDU will show the messages that follow: IN PROGRESS (CHn ONLY) if only one FQI channel is available FLSS TEST NOT AVAILABLE (REFUEL IN PROGRESS) if an automatic refuel is in progress FLSS TEST NOT AVAILABLE (POWER ON TEST IN PROGRESS) if the correct ground conditions are not set. If FQIC channel 1 is not available, the MCDU shows the message FLSCU 1 TEST NOT AVAILABLE. NOTE: For FQIC channel 2, the message is FLSCU 2 TEST NOT AVAILABLE. If there is(are) fault(s), the MCDU shows the defective LRU with the parameters that follow: Description of the defective LRU FIN of the defective LRU GMT when the failure was first found ATA number of the defective LRU.
3.Push (in) the line key <RETURN frequently until the CFDS menu page is shown.

5. Close-up
Subtask 28-46-00-410-053-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) If necessary, close the access door 192MB.

Subtask 28-46-00-410-053-B ** 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) If necessary, close the access door 622KB.

Subtask 28-46-00-860-056-A

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

Subtask 28-46-00-942-053-A

C. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the access platform(s).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 07:03:19 UTC