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R  remove 640HB. 
R  (3) Safety open the spring-loaded surge door 540AZ (640AZ) with the HOOK-
R  COVER (RIB 2 SURGE DOORS) (98D57004013000). 
R  (4) Safety open the spring-loaded surge door 540BZ (640BZ) with the HOOK-
R  COVER (RIB2-SURGE DOORS) (98D57004014000). 
R  4. Procedure_________ 
R  Subtask 28-42-15-020-056 
R  A. Removal of the Wing-Tank Fuel-Quantity Probe 
R  (1) Removal of the probe 21QT1 (21QT2) 
R  FOR 21QT1, 21QT2 
R  (Ref. Fig. 405/TASK 28-42-15-991-004) 
R  CAUTION : MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU_______ 
R  DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE 
R  DAMAGE TO EQUIPMENT. 
R  (a) Remove and discard the cable ties (1) to release the electrical 
R  cable (8) from the probe (11). 
R  (b) Loosen the terminal screw (7) on the terminal block (2). 
R  (c) Loosen the screws (3) (4) and (5) on the terminal block (2). 
R  (d) Identify and remove the electrical connectors of the cable (8). 
R  (e) Remove the bolts (10) and the washers (9). 
R  (f) Remove the bolts (12). 
R  (g) Remove the probe (11). Remove the bracket (13) from the probe 
R  (11).

 

R  Fuel Quantity Probe 21QT1(21QT2) - Detail 
R  Figure 405/TASK 28-42-15-991-004
 1EFF :  301-399,  1  28-42-15 Page 428 
1  1  May 01/04
 1  1
 1CES  1

 

R  (2) Removal of the probe 54QT1 (54QT2) 
R  FOR 54QT1, 54QT2 
R  (Ref. Fig. 406/TASK 28-42-15-991-005) 
R  CAUTION : MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU_______ 
R  DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE 
R  DAMAGE TO EQUIPMENT. 
R  (a) Remove and discard the cable ties (1) to release the electrical 
R  cable (8) from the probe (16). 
R  (b) Loosen the terminal screw (7) on the terminal block (2). 
R  (c) Loosen the screws (3), (4) and (5) on the terminal block (2). 
R  (d) Identify and remove the electrical connectors of the cable (8). 
R  (e) Loosen the clamp screws (10) on the temperature sensors (11). 
R  (f) Loosen the screws (12) and (15). Identify and remove the 
R  electrical connectors from the temperature sensors (11). 
R  (g) Remove the bolts (14) and the washers (13). 
R  (h) Remove the nuts (19) and the bolts (17). 
R  (i) Remove the probe (16). Remove the bracket (18) from the probe 
R  (16). 
R  (3) Removal of the probe 23QT1 (23QT2), 56QT1 (56QT2), 25QT1 
R  (25QT2)...... 
R  FOR 23QT1, 23QT2, 56QT1, 56QT2, 25QT1, 25QT2, 26QT1, 26QT2, 27QT1, 
R  27QT2, 28QT1, 28QT2, 29QT1, 29QT2, 30QT1, 30QT2, 59QT1, 59QT2, 60QT1,
 60QT2, 61QT1, 61QT2, 34QT1, 34QT2 
R  (Ref. Fig. 407/TASK 28-42-15-991-006) 
R  CAUTION : MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU_______ 
R  DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE 
R  DAMAGE TO EQUIPMENT. 
R  (a) Remove and discard the cable ties (3) to release the electrical 
R  cables (10) from the probe (11). 
R  (b) Loosen the terminal screw (9) on the terminal block (4). 
R  (c) Loosen the screws (5) (6) and (7) on the terminal block (4).

 1EFF : 301-399, 1 28-42-15Page 429 1 1 May 01/04 1 1 1CES 1

R  Fuel Quantity Probe 54QT1(54QT2) - Detail 
R  Figure 406/TASK 28-42-15-991-005
 1EFF :  301-399,  1  28-42-15 Page 430 
1  1  May 01/04
 1  1
 1CES  1

 

R Fuel Quantity Probes, Ribs 2 thru 21 - Detail R Figure 407/TASK 28-42-15-991-006
 1EFF : 301-399, 1 28-42-15Page 431 1 1 May 01/04 1 1 1CES 1

R (d) Identify and remove the electrical connectors of the cable (10).
R (e) Remove the bolts (1) and the washers (2).
R (f) Remove the probe (11).
R (4) Put blanking caps on the disconnected electrical connectors.

 1EFF : 301-399, 1 28-42-15Page 432 1 1 May 01/04 1 1 1CES 11EFF : 301-399, 1 28-42-15Page 433 1 1 May 01/05 1 1 1CES 1R B. Consumable Materials

 TASK 28-42-15-400-005
 Installation of the Fuel-Quantity-Probe (21QT1/2,23QT1/2,25QT1/2,26QT1/2,27QT 1/2,28QT1/2/,29QT1/2,30QT1/2,34QT1/2,54QT1/2,56QT1/2,59QT1/ 2,60QT1/2,61QT1/2)
　
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