Removal of the Wing Tank Fuel-Quantity-Probes

TASK 28-42-15-000-001-A
Removal of the Wing Tank Fuel-Quantity-Probes

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.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

FIN: 21QT1 ** ON A/C NOT FOR ALL
FIN: 21QT2 ** ON A/C NOT FOR ALL
FIN: 22QT1 ** ON A/C NOT FOR ALL
FIN: 22QT2 ** ON A/C NOT FOR ALL
FIN: 23QT1 ** ON A/C NOT FOR ALL
FIN: 23QT2 ** ON A/C NOT FOR ALL
FIN: 24QT1 ** ON A/C NOT FOR ALL
FIN: 24QT2 ** ON A/C NOT FOR ALL
FIN: 25QT1 ** ON A/C NOT FOR ALL
FIN: 25QT2 ** ON A/C NOT FOR ALL
FIN: 26QT1 ** ON A/C NOT FOR ALL
FIN: 26QT2 ** ON A/C NOT FOR ALL
FIN: 27QT1 ** ON A/C NOT FOR ALL
FIN: 27QT2 ** ON A/C NOT FOR ALL
FIN: 28QT1 ** ON A/C NOT FOR ALL
FIN: 28QT2 ** ON A/C NOT FOR ALL
FIN: 29QT1 ** ON A/C NOT FOR ALL
FIN: 29QT2 ** ON A/C NOT FOR ALL
FIN: 30QT1 ** ON A/C NOT FOR ALL
FIN: 30QT2 ** ON A/C NOT FOR ALL
FIN: 31QT1 ** ON A/C NOT FOR ALL
FIN: 31QT2 ** ON A/C NOT FOR ALL
FIN: 32QT1 ** ON A/C NOT FOR ALL
FIN: 32QT2 ** ON A/C NOT FOR ALL
FIN: 33QT1 ** ON A/C NOT FOR ALL
FIN: 33QT2 ** ON A/C NOT FOR ALL
FIN: 34QT1 ** ON A/C NOT FOR ALL
FIN: 34QT2 ** 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	ACCESS PLATFORM 4M (13 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [21QT1] (PROBE-FUEL QTY NO 1, RIB 1-2 L WNG TK INR GROUP A)
FOR [22QT1] (PROBE-FUEL QTY NO 2, RIB 1-2 L WNG TK INR GROUP B)
FOR [23QT1] (PROBE-FUEL QTY NO 3, RIB 2-3 L WNG TK INR GROUP A)
FOR [24QT1] (PROBE-FUEL QTY NO 4 AND CIC,RIB 2-3 L WNG TK INR GRP B)
FOR [25QT1] (PROBE-FUEL QTY NO 5, RIB 2-3 L WNG TK INR GROUP A)
FOR [26QT1] (PROBE-FUEL QTY NO 6, RIB 3-4 L WNG TK INR GROUP B)
540AB
FOR [21QT2] (PROBE-FUEL QTY NO 1, RIB 1-2 R WNG TK INR GROUP A)
FOR [22QT2] (PROBE-FUEL QTY NO 2, RIB 1-2 R WNG TK INR GROUP B)
FOR [23QT2] (PROBE-FUEL QTY NO 3, RIB 2-3 R WNG TK INR GROUP A)
FOR [24QT2] (PROBE-FUEL QTY NO 4 AND CIC,RIB 2-3 R WNG TK INR GRP B)
FOR [25QT2] (PROBE-FUEL QTY NO 5, RIB 2-3 R WNG TK INR GROUP A)
FOR [26QT2] (PROBE-FUEL QTY NO 6, RIB 3-4 R WNG TK INR GROUP B)
640AB
FOR [27QT1] (PROBE-FUEL QTY NO 7, RIB 6-7 L WNG TK INR GROUP A)
FOR [28QT1] (PROBE-FUEL QTY NO 8, RIB 6-7 L WNG TK INR GROUP B)
540BB
FOR [27QT2] (PROBE-FUEL QTY NO 7, RIB 6-7 R WNG TK INR GROUP A)
FOR [28QT2] (PROBE-FUEL QTY NO 8, RIB 6-7 R WNG TK INR GROUP B)
640BB
FOR [29QT1] (PROBE-FUEL QTY NO 9, RIB 9-10 L WNG TK INR GROUP A)
540DB
FOR [29QT2] (PROBE-FUEL QTY NO 9, RIB 9-10 R WNG TK INR GROUP A)
640DB
FOR [30QT1] (PROBE-FUEL QTY NO 10, RIB 11-12 L WNG TK INR GROUP B)
540FB
FOR [30QT2] (PROBE-FUEL QTY NO 10, RIB 11-12 R WNG TK INR GROUP B)
640FB
FOR [31QT1] (PROBE-FUEL QTY NO 11, RIB 13-14 L WNG TK INR GROUP A)
540GB
FOR [31QT2] (PROBE-FUEL QTY NO 11, RIB 13-14 R WNG TK INR GROUP A)
640GB
FOR [32QT1] (PROBE-FUEL QTY NO 12, RIB 13-14 L WNG TK INR GROUP B)
540HB
FOR [32QT2] (PROBE-FUEL QTY NO 12, RIB 13-14 R WNG TK INR GROUP B)
640HB
FOR [33QT1] (PROBE-FUEL QTY NO 13, RIB 16-17 L WNG TK OUTR GROUPA)
540LB
FOR [33QT2] (PROBE-FUEL QTY NO 13, RIB 16-17 R WNG TK OUTR GROUPA)
640LB
FOR [34QT1] (PROBE-FUEL QTY NO 14, RIB 20-21 L WNG TK OUTR GROUPB)
540QB
FOR [34QT2] (PROBE-FUEL QTY NO 14, RIB 20-21 R WNG TK OUTR GROUPB)
640QB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-12-46-000-001-A	Removal of the Overpressure Protector Outlet
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-000-002-A	Removal of the Access Panel
Wing Tank Probes - Location.
Wing Tank Probes ** ON A/C NOT FOR ALL
Wing Tank Probes ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-42-15-941-060-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the fuel safety procedures (Ref. AMM TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-42-15-650-053-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Defuel the applicable fuel tank (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 28-42-15-865-050-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FUEL/FQI/CHAN/1	1QT	A13
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
121VU	FUEL/FQI/CHAN/2	2QT	M27

Subtask 28-42-15-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT) in position below the applicable access panel.
(2) Remove the applicable access panel (Ref. AMM TASK 28-10-00-910-002) and (Ref. AMM TASK 57-27-11-000-001) or (Ref. AMM TASK 57-27-11-000-002) and (Ref. AMM TASK 28-12-46-000-001):
(a) FOR [21QT1] (PROBE-FUEL QTY NO 1, RIB 1-2 L WNG TK INR GROUP A), [22QT1] (PROBE-FUEL QTY NO 2, RIB 1-2 L WNG TK INR GROUP B), [23QT1] (PROBE-FUEL QTY NO 3, RIB 2-3 L WNG TK INR GROUP A), [24QT1] (PROBE-FUEL QTY NO 4 AND CIC,RIB 2-3 L WNG TK INR GRP B), [25QT1] (PROBE-FUEL QTY NO 5, RIB 2-3 L WNG TK INR GROUP A), [26QT1] (PROBE-FUEL QTY NO 6, RIB 3-4 L WNG TK INR GROUP B)
remove 540AB
(b) FOR [27QT1] (PROBE-FUEL QTY NO 7, RIB 6-7 L WNG TK INR GROUP A), [28QT1] (PROBE-FUEL QTY NO 8, RIB 6-7 L WNG TK INR GROUP B)
remove 540BB
(c) FOR [29QT1] (PROBE-FUEL QTY NO 9, RIB 9-10 L WNG TK INR GROUP A)
remove 540DB
(d) FOR [30QT1] (PROBE-FUEL QTY NO 10, RIB 11-12 L WNG TK INR GROUP B)
remove 540FB
(e) FOR [31QT1] (PROBE-FUEL QTY NO 11, RIB 13-14 L WNG TK INR GROUP A)
remove 540GB
(f) FOR [32QT1] (PROBE-FUEL QTY NO 12, RIB 13-14 L WNG TK INR GROUP B)
remove 540HB
(g) FOR [33QT1] (PROBE-FUEL QTY NO 13, RIB 16-17 L WNG TK OUTR GROUPA)
remove 540LB
(h) FOR [34QT1] (PROBE-FUEL QTY NO 14, RIB 20-21 L WNG TK OUTR GROUPB)
remove 540QB
(i) FOR [21QT2] (PROBE-FUEL QTY NO 1, RIB 1-2 R WNG TK INR GROUP A), [22QT2] (PROBE-FUEL QTY NO 2, RIB 1-2 R WNG TK INR GROUP B), [23QT2] (PROBE-FUEL QTY NO 3, RIB 2-3 R WNG TK INR GROUP A), [24QT2] (PROBE-FUEL QTY NO 4 AND CIC,RIB 2-3 R WNG TK INR GRP B), [25QT2] (PROBE-FUEL QTY NO 5, RIB 2-3 R WNG TK INR GROUP A), [26QT2] (PROBE-FUEL QTY NO 6, RIB 3-4 R WNG TK INR GROUP B)
remove 640AB
(j) FOR [27QT2] (PROBE-FUEL QTY NO 7, RIB 6-7 R WNG TK INR GROUP A), [28QT2] (PROBE-FUEL QTY NO 8, RIB 6-7 R WNG TK INR GROUP B)
remove 640BB
(k) FOR [29QT2] (PROBE-FUEL QTY NO 9, RIB 9-10 R WNG TK INR GROUP A)
remove 640DB
(l) FOR [30QT2] (PROBE-FUEL QTY NO 10, RIB 11-12 R WNG TK INR GROUP B)
remove 640FB
(m) FOR [31QT2] (PROBE-FUEL QTY NO 11, RIB 13-14 R WNG TK INR GROUP A)
remove 640GB
(n) FOR [32QT2] (PROBE-FUEL QTY NO 12, RIB 13-14 R WNG TK INR GROUP B)
remove 640HB
(o) FOR [33QT2] (PROBE-FUEL QTY NO 13, RIB 16-17 R WNG TK OUTR GROUPA)
remove 640LB
(p) FOR [34QT2] (PROBE-FUEL QTY NO 14, RIB 20-21 R WNG TK OUTR GROUPB)
remove 640QB.

4. Procedure
Subtask 28-42-15-020-057-A ** ON A/C NOT FOR ALL

A. Removal of the Wing-Tank-Fuel-Quantity-Probe

CAUTION: MAKE MATCH MARKS ON ALL THE ELECTRICAL WIRES BEFORE YOU DISCONNECT THEM. INCORRECT CONNECTION OF WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

(1) Cut the cable ties (3) and (7). Remove the cut cable ties (3) and (7) from the tank and discard.

CAUTION: DO NOT PULL THE WIRE WHEN YOU DISCONNECT AN ELECTRICAL CABLE. YOU MUST ONLY PULL THE PLASTIC HOUSING TO REMOVE THE CONNECTION. THIS WILL PREVENT DAMAGE TO THE ELECTRICAL CABLES.

(2) Disconnect the electrical cables (10) from the probe (6) or (9) and put CAP - BLANKING on the electrical cables (10).

NOTE: Probes 24QT1 and 24QT2 also have CIC connections.

(3) For the probe (6):
(a) Hold the probe (6) and remove the bolts (5) and (8) and the washers (4).
(b) Remove the probe (6).
(4) For the probe (9):
(a) Remove the bolts (2).
(b) Hold the probe (9) and remove the bolts (8) and the washers (4).
(c) Remove the probe (9), then remove the support tube (1) from the probe (9).

[Rev.10 from 2021] 2026.04.02 06:18:06 UTC