Installation of the Clack Valve (RIB2)

TASK 28-11-42-400-001-A
Installation of the Clack Valve (RIB2)

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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 2M (6 FT)
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	Torque wrench: range to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.06ABA1)	Polysulfide Sealant-Fuel Tank Brushable -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540AB, 640AB
540AZ, 540BZ, 640AZ, 640BZ

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	COTTER PIN	AIPC 28-11-42-01-010
3	COTTER PIN	AIPC 28-11-42-01-010
4	ORING	AIPC 28-11-42-01-070
5	O-RING	AIPC 28-11-42-01-070
1	COTTER PIN	AIPC 28-11-42-02-010
3	COTTER PIN	AIPC 28-11-42-02-010
12	O-RING	AIPC 28-11-42-02-070
13	O-RING	AIPC 28-11-42-02-070

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 28-25-00-650-001-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 28-25-00-869-001-A	Fuel Transfer
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-400-001-A	Installation of the Access Panel
TASK 57-27-12-000-002-A	Removal of the Rib 2 Access Panel 540AZ(640AZ) or 540BZ(640BZ)
TASK 57-27-12-400-002-A	Installation of the Rib 2 Access Panel 540AZ (640AZ) or 540BZ (640BZ)
Clack valve ** ON A/C NOT FOR ALL
Clack Valve ** ON A/C NOT FOR ALL
Clack Valve ** ON A/C NOT FOR ALL
Clack Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-11-42-941-053-A

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 precautions when you do work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) Make sure that the SAFETY BARRIER(S) are in position.

Subtask 28-11-42-860-050-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable wing tank is defuelled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the ACCESS PLATFORM 2M (6 FT) is below the applicable access panel 540AB(640AB).
(4) Make sure that the applicable access panel is removed 540AB(640AB) (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Make sure that the applicable surge door 540AZ(640AZ) or 540BZ(640BZ) is open and that the 98D57004013000 HOOK-COVER (RIB 2 SURGE DOORS) or the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) is installed

Subtask 28-11-42-860-050-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable wing tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel is drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below the applicable access panel 540AB ( 640AB).
(4) Make sure that the applicable access panel 540AB ( 640AB) is removed (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(5) Make sure that the applicable RIB2 access panels are removed that follow:

For the left wing 540AZ and 540BZ (Ref. AMM TASK 57-27-12-000-002)
For the right wing 640AZ and 640BZ (Ref. AMM TASK 57-27-12-000-002).

4. Procedure

NOTE: Make sure that you keep the applicable clack valve and seating together as they are not interchangeable.

Subtask 28-11-42-420-053-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the applicable AIPC 28-11-42-01-070 O-RING (5) or AIPC 28-11-42-02-070 O-RING (13) with Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) .

Subtask 28-11-42-420-053-B ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the applicable AIPC 28-11-42-01-070 O-RING (5) or AIPC 28-11-42-02-070 O-RING (12) with Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) .

Subtask 28-11-42-420-053-C ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate a new AIPC 28-11-42-01-070 ORING (4) or AIPC 28-11-42-02-070 ORING (12) with Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) .

Subtask 28-11-42-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Clack Valve (RIB 2)
(1) To install the seating (4) or (14):
(a) Install the applicable O-ring (5) or (13) in the seating (4) or (14).
(b) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) below the heads and around the shanks of the screws (10), (11) or (12).

NOTE: Make sure that no sealant touches the interface of the seating (4) or (14) and the rib.

(c) Install the seating (4) or (14) with the screws (10), (11) and/or (12).
(d) Loosely install the washers (6) and the nuts (7) on the screws (10), (11) or (12).
(e) Engage a hexagon key in the recess of the screws (10), (11) or (12) to prevent movement and tighten the nuts (7).
(f) Apply Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the nuts (7) and the screw heads (10), (11) or (12).
(2) To install the clack valve (9) to the seating (4) or (14):
(a) Install the clack valve (9) with the spindle (8) and the distance-tubes (1).
(b) Install the collar (2) on the spindle (8) and install:

a new AIPC 28-11-42-01-010 COTTER PIN (3) for the seating (14)
a new AIPC 28-11-42-02-010 COTTER PIN (3) for the seating (4).

Subtask 28-11-42-710-050-A ** ON A/C NOT FOR ALL

C. Operational Test Of the Clack Valve
(1) Make sure that the clack valve (9) and the spindle (8) are free to move in seating (4) or (14).
(2) Make sure that the clack valve (9) is flat against the seating (4) or (14) when closed.

Subtask 28-11-42-420-050-B ** ON A/C NOT FOR ALL

D. Installation of the Clack Valve (RIB 2)
(1) To install the seating (4) or (13):
(a) Install the applicable O-ring (5) or (12) in the seating (4) or (13).
(b) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) below the heads and around the shanks of the screws (10) or (11).

NOTE: Make sure that no sealant touches the interface of the seating (4) or (13) and the rib.

(c) Install the seating (4) or (13) with the screws (10) and/or (11).
(d) Loosely install the washers (6) and the nuts (7) on the screws (10) or (11).
(e) Engage a hexagon key in the recess of the screws (10) or (11) to prevent movement and tighten the nuts (7).
(f) Apply Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the nuts (7) and the screw heads (10) or (11).
(2) To install the clack valve (9) to the seating (4) or (13):
(a) Install the clack valve (9) with the spindle (8) and the distance-tubes (1).
(b) Install the collar (2) on the spindle (8) and install:

a new AIPC 28-11-42-01-010 COTTER PIN (3) for the seating (13)
a new AIPC 28-11-42-02-010 COTTER PIN (3) for the seating (4).

Subtask 28-11-42-710-050-B ** ON A/C NOT FOR ALL

E. Operational Test of the Clack Valve
(1) Make sure that the clack valve (9) and the spindle (8) are free to move in seating (4) or (13).
(2) Make sure that the clack valve (9) is flat against the seating (4) or (13) when closed.

Subtask 28-11-42-420-050-C ** ON A/C NOT FOR ALL

F. Installation of the Clack Valve (RIB2)
(1) To install the seating (3) on RIB2, do the steps that follow:
(a) Install the new O-ring (4) on the seating (3).
(b) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) below the heads and around the shanks of the screws (5):
1 Make sure that the that the sealant does not touch the interface of the seating (3) and RIB2.
(c) Put the seating (3) in position on RIB2.
(d) Loosely install the screws (5), the washers (6) and the nuts (7).
(e) Engage a hexagon key in the recess of the screws (5) to prevent the movement of the screw.
(f) TORQUE the nuts (7) to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in )

.
(g) Apply the Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the nuts (7) and the screw heads (5).
(2) To install the seating (11) on RIB2, do the steps that follow:
(a) Install the new O-ring (12) on the seating (11).
(b) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) below the heads and around the shanks of the screws (5) and (13):
1 Make sure that the that the sealant does not touch the interface of the seating (11) and RIB2.
(c) Put the seating (11) in position on RIB2.
(d) Loosely install the screws (5) and (13), the washers (6) and the nuts (7).
(e) Engage a hexagon key in the recess of the screws (5) and (13) to prevent the movement of the screw.
(f) TORQUE the nuts (7) to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in )

.
(g) Apply the Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the nuts (7) and the screw heads (5) and (13).
(3) To install the clack valve (9) or (14) to the seating (3) or (11), do the steps that follow:
(a) Put the clack valve (9) or (14) in position on the seating (3) or (11).
(b) Install the distance-tubes (10) with the spindle (8).
(c) Put the collar (2) in position on the spindle (8).
(d) Install a new AIPC 28-11-42-01-010 COTTER PIN (1) for the seatings (3).
(e) Install a new AIPC 28-11-42-02-010 COTTER PIN (1) for the seatings (11).

Subtask 28-11-42-710-050-C ** ON A/C NOT FOR ALL

G. Operational Test of the Clack Valve
(1) Make sure that the clack valve (9) or (14) and the spindle (8) are free to move in seating (3) or (11).
(2) Make sure that you align the clack valve (9) or (14) with the seating (3) or (11) when closed.

Subtask 28-11-42-420-050-D ** ON A/C NOT FOR ALL

H. Installation of the Clack Valve (RIB2)
(1) To install the seating (3) on RIB2, do the steps that follow:
(a) Install the new O-ring (4) on the seating (3).
(b) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) below the heads and around the shanks of the screws (5) and (14):
1 Make sure that the that the sealant does not touch the interface of the seating (3) and RIB2.
(c) Put the seating (3) in position on RIB2.
(d) Loosely install the screws (5) and (14), the washers (6) and the nuts (7).
(e) Engage a hexagon key in the recess of the screws (5) and (14) to prevent the movement of the screw.
(f) TORQUE the nuts (7) to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in )

.
(g) Apply the Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the nuts (7) and the screw heads (5) and (14).
(2) To install the seating (11) on RIB2, do the steps that follow:
(a) Install the new O-ring (12) on the seating (11).
(b) Apply a thin layer of Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) below the heads and around the shanks of the screws (5):
1 Make sure that the that the sealant does not touch the interface of the seating (11) and RIB2.
(c) Put the seating (11) in position on RIB2.
(d) Loosely install the screws (5), the washers (6) and the nuts (7).
(e) Engage a hexagon key in the recess of the screws (5) to prevent the movement of the screw.
(f) TORQUE the nuts (7) to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in )

.
(g) Apply the Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the nuts (7) and the screw heads (5).
(3) To install the clack valve (9) or (13) to the seating (3) or (11), do the steps that follow:
(a) Put the clack valve (9) or (13) in position on the seating (3) or (11).
(b) Install the distance-tubes (10) with the spindle (8).
(c) Put the collar (2) in position on the spindle (8).
(d) Install a new AIPC 28-11-42-01-010 COTTER PIN (1) for the seatings (11).
(e) Install a new AIPC 28-11-42-02-010 COTTER PIN (1) for the seatings (3).

Subtask 28-11-42-710-050-D ** ON A/C NOT FOR ALL

I. Operational Test of the Clack Valve
(1) Make sure that the clack valve (9) or (13) and the spindle (8) are free to move in seating (3) or (11).
(2) Make sure that you align the clack valve (9) or (13) with the seating (3) or (11) when closed.

5. Close-up
Subtask 28-11-42-410-050-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) Carefully close the applicable surge door:

to close the forward surge door, remove the 98D57004013000 HOOK-COVER (RIB 2 SURGE DOORS),
to close the aft surge door, remove the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS).

(3) Install the applicable access panel 540AB 640AB, (Ref. AMM TASK 57-27-11-400-001).

Subtask 28-11-42-410-050-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) Install the applicable RIB2 access panels that follow:

For the left wing, install 540AZ and 540BZ (Ref. AMM TASK 57-27-12-400-002)
For the right wing, install 640AZ and 640BZ (Ref. AMM TASK 57-27-12-400-002).

(3) Install the applicable access panel 540AB ( 640AB) (Ref. AMM TASK 57-27-11-400-001).

Subtask 28-11-42-650-054-A

B. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-11-42-942-050-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 06:17:06 UTC