4. Procedure
_________
 (Ref. Fig. 406/TASK 57-27-11-991-008) Subtask 57-27-11-110-054
 A. Preparation for Installation
 (1)
 Use a MISCELLANEOUS (Material No. 19-003), made moist with CLEANING AGENTS (Material No. 11-026) to clean the interfaces of:

 -
the closing panel (2)

 -
the dry bay structure (1).

 (2)
 Examine for damage the interfaces of:

 -
the closing panel (2)

 -
the dry bay structure (1).

 (3)
 On a pre modification 26839 (composite) closing panel (2):

 (a)
 Examine the aluminium foil layer on the fuel-tank side of each panel (2) for damage.

 (b)
 The closing panel (2) must be replaced if there is:

 -damage to the foil around any of the electrical-bonding positions
 -
any splits in the foil.
 NOTE : Straight horizontal splits of less than 50 mm (1.9685 in.)

____ in length are permitted if no loss of foil has occured.

 -
any area where the foil is not correctly bonded to the panel. NOTE : Separation is permitted if it is less than 6 mm (0.2362

____ in.) from the panel outer edge (and not at an electrical-bonding position).
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 Subtask 57-27-11-420-055
 B. Installation of the Closing Panel
 NOTE : There are two different types of closing panel available which are
____ interchangable. If a replacement closing panel of a different type is to be installed the fasteners must also be replaced. Discard the used fasteners and get the applicable fasteners for the new type of closing panel.
 (1) Install a pre modification 26839 (composite) closing panel as follows:
 (a) Apply SEALANTS (Material No. 09-018) or SEALANTS (Material No. 09-019) to the interfaces of:
 -
the closing panel (2)

 -
the dry bay structure (1).

 NOTE : At each electrical bonding position keep a 15mm (0.59 in.)
____ diameter area around the bolt hole clear of sealant.
 (b)
 Make sure that there is no sealant applied to:

 -
the threads of the bolts (4)

 -
the structure (1) captive-nuts.

 (c)
 Make sure that the work area is clean and clear of tools and equipment.

 (d)
 Put the closing panel (2) in position and install the bolts (4) and the washers (3). Tighten the bolts (4) in a diagonally-opposite sequence.

 (e)
 Do a bonding test between the closing panel (2) and the dry bay structure (1). (Ref. TASK 20-28-00-912-002). Make sure that the electrical resistance is less than 10 milliohms.

 (f)
 Apply a continuous bead of SEALANTS (Material No. 09-002) and make a fillet seal between the closing panel (2) and structure (1):

 -
at the joint on the fuel-tank side of the closing panel (2)

 -
at the joint on the dry bay side of the closing panel (2).

 (g)
 Use a brush to apply an overcoat layer of SEALANTS (Material No. 09-001) or SEALANTS (Material No. 09-002) on the fuel-tank side to:

 -
the bolts (4)

 -
the washers (3)

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 -the joint between the closing panel (2) and the structure (1).
 (2) Install a post modification 26839 (solid alloy) closing panel as follows:
 (a) Apply SEALANTS (Material No. 09-018) or SEALANTS (Material No. 09-019) to:
 -
the interface of the closing panel (2)

 -
the interface of the dry bay structure (1)

 -to the shank and the bottom of the head of each bolt (4).
 NOTE : At each electrical bonding position keep a 15mm (0.59 in.)
____ diameter area around the bolt hole clear of sealant.
 (b)
 Make sure that there is no sealant applied to:

 -
the threads of the bolts (4)

 -
the structure (1) captive-nuts.

 (c)
 Make sure that the work area is clean and clear of tools and equipment.

 (d)
 Put the closing panel (2) in position and install the bolts (4).

 NOTE : Make sure that the closing panel (2) is installed with the
____ WET SIDE identification mark on the fuel-tank side.
 (e)
 Tighten the bolts (4) in a diagonally-opposite sequence to between 0.8 and 0.9 m.daN (70.79 and 79.64 lbf.in).

 (f)
 Check all the bolts (4) are correctly tightened to between 0.8 and 0.9 m.daN (70.79 and 79.64 lbf.in).
　
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