(2)
Make sure that the scuff plates are in the correct condition and are not damaged. If necessary, replace the damaged scuff plates.
(3)
Before you install new, or the removed scuff plates, you must treat the scuff plates (1) and (4) as follows:
(a)
Clean the mating surface of each plate with CLEANING AGENTS (Material No. 11-003).
(b)
Sand blast the inner areas of both scuff plate sections.
(c)
Apply STRUCTURE PAINTS (Material No. 16-001) to the sand blasted areas.
(4)
Make sure that the scuff plates are in the correct condition and that they fit satisfactorily.
(5)
Do an inspection of the component interface and/or the adjacent area.
(6)
Put the vacuum equipment adjacent the BULK cargo-compartment door.
NOTE : The use of a strong vacuum pump for the attachment of the
____
scuff plates is recommended.
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Subtask 53-45-15-420-051
B. Installation of the Scuff Plates R **ON A/C 001-049, 051-099, 101-149, 221-221, 224-224, 228-228,
(Ref. Fig. 404/TASK 53-45-15-991-003) R **ON A/C 001-049, 051-099, 101-149, 221-221, 224-224, 228-228, 301-399,
(Ref. Fig. 406/TASK 53-45-15-991-005)
(1)
Apply adhesive tape, 3M Scotch 471F-15, Blue, approximately 15 mm (0.5905 in.) wide to the inner edges of the scuff plate sections (1) and (4).
(2)
Around the inner areas of the scuff plate screw holes, apply the adhesive tape to a radius of approximately 20 mm (0.7874 in.).
(3)
Apply a layer of the release agent, SPECIAL MATERIALS (Material No. 05-013A) to the remaining inner areas of the scuff plates (1) and (4).
NOTE : The correct application of the release agent makes sure that
____ the scuff plates are not damaged during the next removal procedure.
(4)
Apply a thin layer of SEALANTS (Material No. 09-013) to the scuff plate mating area of the fuselage skin (Ref. TASK 51-76-11-300-001).
(5)
If necessary, apply SEALANTS (Material No. 09-013) to the inside of the scuff plates (1) and (4).
(6)
Remove the adhesive tape from the scuff plates and put the scuff plate sections (1) and (4) in position.
(7)
Align the scuff plate sections (1) and (4) and install and tighten the screws (2) and the washers (3).
(8)
Remove any unwanted sealant from around the scuff plates.
(9)
Install the vacuum equipment.
(Ref. Fig. 405/TASK 53-45-15-991-004)
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(10)
Attach the SEALANTS (Material No. 09-030) (11) around and
approximately 30 mm (1.1811 in.) from the edges of the scuff plates.
(11)
Install a sheet of porous felt (12) on the scuff plates.
(12)
Attach the porous felt (12) with BONDING AND ADHESIVE COMPOUNDS (Material No. 08-065) to the scuff plates.
(13)
Attach the vacuum valve (14) to the SPECIAL MATERIALS (Material No. 05-068) (13).
(14)
Put the SPECIAL MATERIALS (Material No. 05-068) (13) in position on the scuff plates.
NOTE : Make sure that the SPECIAL MATERIALS (Material No. 05-068)
____ make an overlap of the seal tape by approximately 30 mm (1.1811 in.).
(15)
Connect the vacuum pump to the vacuum valve (14).
(16)
Operate the vacuum pump for as long as necessary. Refer to the
environmental temperature shown in the table: -------------------------------------------------------------------------------TEMPERATURE TIME -------------------------------------------------------------------------------
18 deg.C (64.40 deg.F) for 48 hours 20 deg.C (68.00 deg.F) for 30 hours 23 deg.C (73.40 deg.F) for 24 hours
(17)
Disconnect the vacuum pump.
(18)
Remove the SPECIAL MATERIALS (Material No. 05-068) (13).
(19)
Remove the vacuum valve (14) from the SPECIAL MATERIALS (Material No. 05-068) (13).
(20)
Remove the porous felt (12).
(21)
Remove the seal tape (11).
(22)
Clean the scuff plates and adjacent area with CLEANING AGENTS (Material No. 11-003).
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