W DOC AIRBUS | AMM A320F

Use of Magnetic Level Indicators (MLI)

TASK 12-11-28-650-007-A
Use of Magnetic Level Indicators (MLI)

CAUTION: RETRACT THE MLI's AS SOON AS POSSIBLE. YOU CAN EASILY CAUSE DAMAGE TO AN EXTENDED MLI.
CAUTION: DO NOT LET THE MLI's FALL FREELY.
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
192MB
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 12-11-28-650-001-A
General Refuel/Defuel Safety Procedures
TASK 12-11-28-650-002-A
Refuel/Defuel Safety Procedures for use in the Hangar
TASK 12-11-28-860-001-A
Procedure to use the ADIRU to Find the Pitch and Roll Data
TASK 12-11-28-860-002-A
Procedure to use the FQIC Input Parameters to Find the Pitch and Roll Data
TASK 12-32-28-281-001-A
Drain Water Content
F Magnetic Level Indicators (MLI) ** ON A/C NOT FOR ALL
F Magnetic Level Indicators (MLI) ** ON A/C NOT FOR ALL
F Magnetic Level Indicators (MLI) ** ON A/C NOT FOR ALL
F Magnetic Level Indicators (MLI) ** ON A/C NOT FOR ALL
F Attitude Monitor ** ON A/C NOT FOR ALL
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read the CTR MLI ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitude D ** ON A/C NOT FOR ALL
F Refuel/Defuel Control Panel 800VU, Preselector 5QT and Indicator 6QT ** ON A/C NOT FOR ALL
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 1 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 6 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 7 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 6 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 7 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 6 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 7 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 6 Attitude D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI 7 Attitude D (A321 Aircraft) ** ON A/C NOT FOR ALL
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.1 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.5 Attitude D ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitudes A and G ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitudes B and F ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitudes C and E ** ON A/C NOT FOR ALL
F Fuel Quantity - CTR MLI Attitude D ** ON A/C NOT FOR ALL
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes A and G (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes B and F (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes C and E (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.2 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.3 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
F Fuel Quantity - MLI Stick No.4 Attitudes D (A321 Aircraft) ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 12-11-28-941-058-A
A. Safety Precautions
   (1) You must obey the refuel/defuel safety precautions (Ref. AMM TASK 12-11-28-650-001) (Ref. AMM TASK 12-11-28-650-002).
   (2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
Subtask 12-11-28-281-050-A ** ON A/C NOT FOR ALL
B. Fuel Sampling
   (1) Get a fuel sample from the aircraft (Ref. AMM TASK 12-32-28-281-001) and measure its Specific Gravity (SG).
Subtask 12-11-28-281-050-B ** ON A/C NOT FOR ALL
B. Fuel Sampling
   (1) Get a fuel sample from the aircraft (Ref. AMM TASK 12-32-28-281-001) and measure its actual density.
Subtask 12-11-28-010-058-A
C. Get Access
   (1) Put an ACCESS PLATFORM 3M (10 FT) below the applicable MLI.
   (2) Open the access door 192MB.
NOTE: If operating in battery power, do not keep the door open longer than necessary because the battery can discharge.
Subtask 12-11-28-860-066-A ** ON A/C NOT FOR ALL
D. Aircraft Maintenance Configuration
F Attitude Monitor ** ON A/C NOT FOR ALL
   (1) Find and write down the aircraft attitude figure (pitch and roll data) from one of the three procedures that follow:
     (a) Read the aircraft attitude (grid square letter and grid square number) shown by the bubble on the attitude monitor 39QM.
NOTE: The attitude monitor operates when the temperature is between -40 deg.C (-40 deg.F) to +50 deg.C (122 deg.F). If the temperature is not in the specified limits, you can do an alternative procedure to find the aircraft attitude figure.
     (b) Use the Air Data/Inertial Reference Unit (ADIRU) to find the aircraft attitude figure (Ref. AMM TASK 12-11-28-860-001).
     (c) Use the Fuel Quantity Indication Computer (FQIC) input parameters to find the aircraft attitude figure (Ref. AMM TASK 12-11-28-860-002).
Subtask 12-11-28-860-066-B ** ON A/C NOT FOR ALL
D. Aircraft Maintenance Configuration
   (1) Find and write down the aircraft attitude figure (pitch and roll data) as follows:
4. Procedure
Subtask 12-11-28-869-053-A ** ON A/C NOT FOR ALL
A. Use of the Magnetic Level Indicators (MLI)
   (1) Use the flow chart and do these steps:
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read the CTR MLI ** ON A/C NOT FOR ALL
     (a) Use a screwdriver to push the applicable MLI and turn it through 90 deg.
     (b) Hold and carefully lower the MLI fully. Then carefully lift the MLI until you feel the magnets engage.
     (c) Read the units mark nearest to the bottom-skin of the wing and write down the number.
   (2) Retract the MLI and use a screwdriver to turn it through 90 deg. to lock it.
   (3) Find the volume of fuel in each tank as follows:
     (a) Use the applicable MLI stick number and the applicable aircraft attitude grid-square letter to find the correct fuel quantity table.
NOTE: For a grid reading of C3:
  • use the attitude monitor reading CLEFT WING column 3 for the LH wing
  • use the attitude monitor reading CRIGHT WING column 3 for the RH wing.
     (b) Find the applicable MLI unit number row and the applicable aircraft attitude (grid-square letter and number) row in the table. Find the intersection of the applicable rows to give the correct volume of fuel in the tank.
NOTE: Only even number MLI units are listed in the tables. To calculate the volume of fuel for uneven numbers, interpolate between the nearest even numbers in the table.

------------------------------------------------------------------------------
! Example: MLI stick No. 1 (LH Wing) !
! UNIT reading : 36 !
! Pitch and Roll attitude : C3 on (attitude monitor) !
! Fuel Quantity table reading (volume) : 1150 l !
! Specific gravity (SG) of fuel sample : 0.81 SG !
!----------------------------------------------------------------------------!
! Actual fuel mass at 0.81 SG = 1150 x 0.81 = 931.5 kg !
------------------------------------------------------------------------------


NOTE: The above example is for one MLI only.

   (4) Add together the values for each tank to find the total volume of fuel.
NOTE: The MLI are accurate to +/- 5% of their indication. This is not sufficiently accurate to use them as a datum for the Fuel Quantity Indication (FQI).
   (5) Multiply the total volume of the fuel by the SG of the fuel. The result is the total mass of the fuel.
NOTE: When the outer cell is full it is not possible to get an accurate reading above 220 l (58.1174 USgal). This is because of the MLI No.5 position and the shape of the cell.
NOTE: At some attitudes, MLI No. 5 can only show a maximum fuel reading of 850 l (224.5444 USgal). The maximum capacity of the outer wing cell is 880 l (232.4695 USgal).
NOTE: When the aircraft is fully refueled, the maximum capacity of the inner wing cell is 6924 l (1829.1124 USgal).
Subtask 12-11-28-869-053-B ** ON A/C NOT FOR ALL
A. Use of the Magnetic Level Indicators (MLI)
   (1) Use the flow chart and do these steps:
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
     (a) Use a screwdriver to push the applicable MLI and turn it through 90 deg.
     (b) Hold and carefully lower the MLI fully. Then carefully lift the MLI until you feel the magnets engage.
     (c) Read the units mark nearest to the bottom-skin of the wing and write down the number.
   (2) Retract the MLI and use a screwdriver to turn it through 90 deg. to lock it.
   (3) Find the volume of fuel in each tank as follows:
     (a) Use the applicable MLI stick number and the applicable aircraft attitude grid-square letter to find the correct fuel quantity table. The tables are on the inside of access panel 192MB.
F Refuel/Defuel Control Panel 800VU, Preselector 5QT and Indicator 6QT ** ON A/C NOT FOR ALL
     (b) Find the applicable MLI unit row and the applicable aircraft attitude (grid- square letter and number) row in the table. Find the intersection of the applicable rows to give the correct volume of fuel in the tank.
NOTE: Only even number MLI units are listed in the tables. To calculate the volume of fuel for uneven numbers, interpolate between the nearest even numbers in the table.

   (4) Add together the values for each tank to find the total volume of fuel.

NOTE: The MLI are accurate to +/- 5% of their indication . This is not sufficiently accurate to use them as a datum for the FQI.
   (5) Multiply the total volume of the fuel by the SG of the fuel. The result is the total mass of the fuel.
NOTE: When the outer cell is full it is not possible to get an accurate reading above 220 l (58.1174 USgal). This is because of the MLI No.5 position and the shape of the cell.
NOTE: At some attitudes, MLI No. 5 can only show a maximum fuel reading of 850 l (224.5444 USgal). The maximum capacity of the outer wing cell is 880 l (232.4695 USgal).
NOTE: When the aircraft is fully refueled, the maximum capacity of the inner wing cell is 6924 l (1829.1124 USgal).
Subtask 12-11-28-869-053-C ** ON A/C NOT FOR ALL
A. Use of the Magnetic Level Indicators (MLI)
   (1) Use the flow chart and do these steps:
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read the CTR MLI ** ON A/C NOT FOR ALL
     (a) Use a screwdriver to push the applicable MLI and turn it through 90 deg.
     (b) Hold and carefully lower the MLI fully. Then carefully lift the MLI until you feel the magnets engage.
     (c) Read the units mark nearest to the bottom-skin of the wing and write down the number.
   (2) Retract the MLI and use a screwdriver to turn it through 90 deg. to lock it.
   (3) Find the volume of fuel in each tank as follows:
     (a) Use the applicable MLI stick number and the applicable aircraft attitude grid-square letter to find the correct fuel quantity table.
NOTE: For a grid reading of C3:
  • use the attitude monitor reading CLEFT WING column 3 for the LH wing
  • use the attitude monitor reading CRIGHT WING column 3 for the RH wing.
     (b) Find the applicable MLI unit number row and the applicable aircraft attitude (grid-square letter and number) row in the table. Find the intersection of the applicable rows to give the correct volume of fuel in the tank.
NOTE: Only even number MLI units are listed in the tables. To calculate the volume of fuel for uneven numbers, interpolate between the nearest even numbers in the table.

------------------------------------------------------------------------------
! Example: MLI stick No. 1 (LH Wing) !
! UNIT reading : 20 !
! Pitch and Roll attitude : C3 on (attitude monitor) !
! Fuel Quantity table reading (volume) : 500 l !
! Specific gravity (SG) of fuel sample : 0.81 SG !
!----------------------------------------------------------------------------!
! Actual fuel mass at 0.81 SG = 500 x 0.81 = 405 kg !
------------------------------------------------------------------------------


NOTE: The above example is for one MLI only.

   (4) Add together the values for each tank to find the total volume of fuel.
NOTE: The MLI are accurate to +/- 5% of their indication. This is not sufficiently accurate to use them as a datum for the FQI.
NOTE: When the aircraft is fully refueled, the maximum capacity of the wing cell is 7750 l (2047.3167 USgal).
   (5) Multiply the total volume of the fuel by the SG of the fuel. The result is the total mass of the fuel.
Subtask 12-11-28-869-053-D ** ON A/C NOT FOR ALL
A. Use of the Magnetic Level Indicators (MLI)
   (1) Use the flow chart and do these steps:
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read the CTR MLI ** ON A/C NOT FOR ALL
     (a) Use a screwdriver to push the applicable MLI and turn it through 90 deg.
     (b) Hold and carefully lower the MLI fully. Then carefully lift the MLI until you feel the magnets engage.
     (c) Read the units mark nearest to the bottom-skin of the wing and write down the number.
   (2) Retract the MLI and use a screwdriver to turn it through 90 deg. to lock it.
   (3) Find the volume of fuel in each tank as follows:
     (a) Use the applicable MLI stick number and the applicable aircraft attitude grid-square letter to find the correct fuel quantity table.
NOTE: For a grid reading of C3:
  • use the attitude monitor reading CLEFT WING column 3 for the LH wing
  • use the attitude monitor reading CRIGHT WING column 3 for the RH wing.
     (b) Find the applicable MLI unit number row and the applicable aircraft attitude (grid-square letter and number) row in the table. Find the intersection of the applicable rows to give the correct volume of fuel in the tank.
NOTE: Only even number MLI units are listed in the tables. To calculate the volume of fuel for uneven numbers, interpolate between the nearest even numbers in the table.

------------------------------------------------------------------------------
! Example: MLI stick No. 1 (LH Wing) !
! UNIT reading : 36 !
! Pitch and Roll attitude : C3 on (attitude monitor) !
! Fuel Quantity table reading (volume) : 300 USgal !
! Actual density of fuel sample : 6.75 lb/USgal !
!--------------------------------------------------------------------------- !
! Actual fuel mass at 6.75 lb/USgal = 300 x 6.75 = 2025 lb !
------------------------------------------------------------------------------


NOTE: The above example is for one MLI only.

   (4) Add together the values for each tank to find the total volume of fuel.
NOTE: The MLI are accurate to +/- 5% of their indication. This is not sufficiently accurate to use them as a datum for the Fuel Quantity Indication (FQI).
   (5) Multiply the total volume of the fuel by the actual density of the fuel. The result is the total mass of the fuel.
NOTE: When the outer cell is full it is not possible to get an accurate reading above 220 l (58.1174 USgal). This is because of the MLI No.5 position and the shape of the cell.
NOTE: At some attitudes, MLI No. 5 can only show a maximum fuel reading of 850 l (224.5444 USgal). The maximum capacity of the outer wing cell is 880 l (232.4695 USgal).
NOTE: When the aircraft is fully refueled, the maximum capacity of the inner wing cell is 6924 l (1829.1124 USgal).
Subtask 12-11-28-869-053-F ** ON A/C NOT FOR ALL
A. Use of the Magnetic Level Indicators (MLI)
   (1) Use the flow chart and do these steps:
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read the CTR MLI ** ON A/C NOT FOR ALL
     (a) Use a screwdriver to push the applicable MLI and turn it through 90 deg.
     (b) Hold and carefully lower the MLI fully. Then carefully lift the MLI until you feel the magnets engage.
     (c) Read the units mark nearest to the bottom-skin of the wing and write down the number.
   (2) Retract the MLI and use a screwdriver to turn it through 90 deg. to lock it.
   (3) Find the volume of fuel in each tank as follows:
     (a) Use the applicable MLI stick number and the applicable aircraft attitude grid-square letter to find the correct fuel quantity table.
NOTE: For a grid reading of C3:
  • use the attitude monitor reading CLEFT WING column 3 for the LH wing
  • use the attitude monitor reading CRIGHT WING column 3 for the RH wing.
     (b) Find the applicable MLI unit number row and the applicable aircraft attitude (grid-square letter and number) row in the table. Find the intersection of the applicable rows to give the correct volume of fuel in the tank.
NOTE: Only even number MLI units are listed in the tables. To calculate the volume of fuel for uneven numbers, interpolate between the nearest even numbers in the table.

------------------------------------------------------------------------------
! Example: MLI stick No. 2 (LH Wing) !
! UNIT reading : 20 !
! Pitch and Roll attitude : C3 on (attitude monitor) !
! Fuel Quantity table reading (volume) : 4000 l !
! Specific gravity (SG) of fuel sample : 0.81 SG !
!----------------------------------------------------------------------------!
! Actual fuel mass at 0.81 SG = 4000 x 0.81 = 3240 kg !
------------------------------------------------------------------------------


NOTE: The above example is for one MLI only.

   (4) Add together the values for each tank to find the total volume of fuel.
NOTE: The MLI are accurate to +/- 5% of their indication. This is not sufficiently accurate to use them as a datum for the Fuel Quantity Indication (FQI).
   (5) Multiply the total volume of the fuel by the SG of the fuel. The result is the total mass of the fuel.
NOTE: When the outer cell is full it is not possible to get an accurate reading above 220 l (58.1174 USgal). This is because of the MLI No.5 position and the shape of the cell.
NOTE: At some attitudes, MLI No. 5 can only show a maximum fuel reading of 850 l (224.5444 USgal). The maximum capacity of the outer wing cell is 880 l (232.4695 USgal).
NOTE: When the aircraft is fully refueled, the maximum capacity of the inner wing cell is 6924 l (1829.1124 USgal).
Subtask 12-11-28-869-053-H ** ON A/C NOT FOR ALL
A. Use of the Magnetic Level Indicators (MLI)
   (1) Use the flow chart and do these steps:
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read the CTR MLI ** ON A/C NOT FOR ALL
     (a) Use a screwdriver to push the applicable MLI and turn it through 90 deg.
     (b) Hold and carefully lower the MLI fully. Then carefully lift the MLI until you feel the magnets engage.
     (c) Read the units mark nearest to the bottom-skin of the wing and write down the number.
   (2) Retract the MLI and use a screwdriver to turn it to 90 deg. to lock it.
   (3) Find the volume of the fuel in each tank as follows:
     (a) Use the applicable MLI stick number and the applicable aircraft attitude grid-square letter to find the correct fuel quantity table.
NOTE: For a grid reading of C3:
  • Use the attitude monitor reading CLEFT WING column 3 for the LH wing
  • Use the attitude monitor reading CRIGHT WING column 3 for the RH wing.
     (b) Find the applicable MLI unit number row and the applicable aircraft attitude (grid-square letter and number) row in the table. Find the intersection of the applicable rows to give the correct volume of the fuel in the tank.
NOTE: Only even number MLI units are listed in the table. To calculate the volume of the fuel for uneven numbers, interpolate between the nearest even numbers in the table.

------------------------------------------------------------------------------
! Example: MLI stick No. 2 (LH Wing) !
! UNIT reading : 20 !
! Pitch and Roll attitude : C3 on (attitude monitor) !
! Fuel Quantity table reading (volume) : 4050 l !
! Specific gravity (SG) of fuel sample : 0.81 SG !
!----------------------------------------------------------------------------!
! Actual fuel mass at 0.81 SG = 4050 x 0.81 = 3280.5 kg !
------------------------------------------------------------------------------


NOTE: The above example is for one MLI only.

   (4) Add together the values for each tank to find the total volume of the fuel.
NOTE: The MLI are accurate to +/- 5% of their indication. This is not sufficiently accurate to use them as a datum for the FQI.
NOTE: When you use MLI No. 4, it is not possible to get an accurate reading above 7050 l (1862.3978 USgal). This is because of the position of MLI No. 4 and the shape of the cell.
NOTE: When the aircraft is fully refueled, the maximum capacity of the wing cell is 7750 l (2047.3167 USgal).
   (5) Multiply the total volume of the fuel by the SG of the fuel. The result is the total mass of the fuel.
Subtask 12-11-28-869-053-I ** ON A/C NOT FOR ALL
A. Use of the Magnetic Level Indicators (MLI)
   (1) Use the flow chart and do these steps:
F How to Read a Wing Tank MLI ** ON A/C NOT FOR ALL
F How to Read the CTR MLI ** ON A/C NOT FOR ALL
     (a) Use a screwdriver to push the applicable MLI and turn it through 90 deg.
     (b) Hold and carefully lower the MLI fully. Then carefully lift the MLI until you feel the magnets engage.
     (c) Read the units mark nearest to the bottom-skin of the wing and write down the number.
   (2) Retract the MLI and use a screwdriver to turn it to 90 deg. to lock it.
   (3) Find the volume of the fuel in each tank as follows:
     (a) Use the applicable MLI stick number and the applicable aircraft attitude grid-square letter to find the correct fuel quantity table.
NOTE: For a grid reading of C3:
  • Use the attitude monitor reading CLEFT WING column 3 for the LH wing
  • Use the attitude monitor reading CRIGHT WING column 3 for the RH wing.
     (b) Find the applicable MLI unit number row and the applicable aircraft attitude (grid-square letter and number) row in the table. Find the intersection of the applicable rows to give the correct volume of the fuel in the tank.
NOTE: Only even number MLI units are listed in the table. To calculate the volume of the fuel for uneven numbers, interpolate between the nearest even numbers in the table.

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! Example: MLI stick No. 2 (LH Wing) !
! UNIT reading : 20 !
! Pitch and Roll attitude : C3 on (attitude monitor) !
! Fuel Quantity table reading (volume) : 1050 USgal !
! Actual density of fuel sample : 6.75 lb/USgal !
!----------------------------------------------------------------------------!
! Actual fuel mass at 6.75 lb/USgal = 1050 x 6.75 = 7087.5 lb !
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NOTE: The above example is for one MLI only.

   (4) Add together the values for each tank to find the total volume of the fuel.
NOTE: The MLI are accurate to +/- 5% of their indication. This is not sufficiently accurate to use them as a datum for the FQI.
NOTE: When you use MLI No. 4, it is not possible to get an accurate reading above 7050 l (1862.3978 USgal). This is because of the position of MLI No. 4 and the shape of the cell.
NOTE: When the aircraft is fully refueled, the maximum capacity of the wing cell is 7750 l (2047.3167 USgal).
   (5) Multiply the total volume of the fuel by the actual density of the fuel. The result is the total mass of the fuel.
5. Close-up
Subtask 12-11-28-410-058-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the access door 192MB.
Subtask 12-11-28-942-059-A
B. Removal of Equipment
   (1) Remove the safety barriers.
   (2) Remove the WARNING NOTICE(S).
   (3) Remove the access platform(s).
   (4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
[Rev.10 from 2021] 2026.04.01 04:29:09 UTC
"Aviabrain" 2025