R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
28-11-42-991-001 Fig. 401
**ON A/C 301-399,
28-11-42-991-001-A Fig. 401A
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3. Job Set-up
__________
Subtask 28-11-42-941-053
A. Safety Precautions WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
(1) You must obey the fuel safety precautions (Ref. TASK 28-10-00-910-001) when you do work in do work in a fuel tank.
(2) Make sure that the safety barriers are in position.
Subtask 28-11-42-860-050
B. Aircraft Maintenance Configuration
(1)
Make sure that the applicable wing tank is defuelled (Ref. TASK 28-25-00-650-001).
(2)
Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. TASK 28-25-00-650-003).
(3)
Make sure that the access Platform is below the applicable access panel 540AB(640AB).
(4)
Make sure that the applicable access panel is removed 540AB(640AB) (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-27-11-000-001).
(5)
Make sure that the applicable surge door 540AZ(640AZ) or 540BZ(640BZ) is open and that the HOOK-COVER (RIB 2 SURGE DOORS) (98D57004013000) or the HOOK-COVER (RIB2-SURGE DOORS) (98D57004014000) is installed
4. Procedure
_________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 401/TASK 28-11-42-991-001)
**ON A/C 301-399,
(Ref. Fig. 401A/TASK 28-11-42-991-001-A)
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NOTE : Make sure that you keep the applicable clack valve and seating
____
together as they are not interchangeable.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Subtask 28-11-42-420-053
A. Preparation for Installation
(1)
Clean the component interface and/or the adjacent area with a MISCELLANEOUS (Material No. 19-003) made moist with CLEANING AGENTS (Material No. 11-026).
(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 interface and/or the adjacent area.
(4)
Lubricate the applicable O-ring (5) or O-ring (13) with FUELS (Material No. 01-001) or COMMON GREASE (Material No. 04-012).
Subtask 28-11-42-420-050
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 SEALANTS (Material No. 09-017) 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).
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(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 SEALANTS (Material No. 09-017) 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 cotter pin (3) for the seating (14) - a new cotter pin (3) for the seating (4).
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