DO NOT PLUG OR OBSTRUCT DRAIN PATHS
LOWER BIFURCATION
A
Insulation Coating ThicknessFigure 802 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
78-31-01
ALL ú ú N01 Page 810 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(c)
The maximum cure time is four hours at 30 to 49 percent humidity.
(d)
Where necessary, use BMS 10-102, Type I, Class 2, to apply a molded patch insulative coating system.
(e)
Cut the repair plug from the plug material to the accurate dimension of the repair area.
(f)
WHEN YOU USE BOEING MATERIAL SPECIFICATION 10-102 TO APPLY A TYPE I INSULATION COATING; refer to the supplier's recommendations when you mix the coating.
(g)
WHEN YOU USE BMS 10-102 TYPE II; prepare as follows: 1) Use the Nuocure 28 (Tin Octoate) to prepare
the BMS 10-102, Type II. 2) Mix the base material before you add the catalyst. 3) Use the table in Fig. 801 to find the necessary pot life. 4) Add the catalyst to the base material. 5) Mix the catalyst and base material fully.
(h)
Apply the BMS 10-102, Type II to the primed area and the repair plug mating surface.
(i)
Push the repair plug into position.
(j)
Seal the mating area between the insulation and the repair plug with the BMS 10-102, TYPE II.
(k)
Use the teflon sheet to hold the plug in its position.
(l)
Push out all the air that is caught. 1) Work out from the center.
(m)
Permit sufficient time for the BMS 10-102, TYPE II to dry.
(n)
Make sure the repair plug bonded correctly.
(o)
If the edges did not bond, apply the BMS 100-102, Type II and push it correctly into its position.
(p)
Permit sufficient time for the BMS 10-102, Type II to dry.
(q)
If you use a patch without the BMS 10-102 top coat layer, apply the BMS 10-102, Type II topcoat layer to the repair area. 1) DO the procedure: Apply the BMS 10-102, Type II topcoat
coat layer.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
78-31-01
ALL ú ú N01 Page 811 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
I. Prepare a molded patch with the BMS 10-102, Type I Class 2, Spec insulation coating
S 848-055-N00
(1) Prepare tooling molds from master models or other engineering approved models.
(a)
Lightly abrade the mold surfaces to remove any release agent.
(b)
Remove all residues with solvent.
(c)
Apply release agent to mold.
S 918-056-N00
(2) The BMS 10-102 type insulation coating systems come in kits that contain these parts:
(a)
Part A (base material)
(b)
Part B (catalyst)
(c)
Part C (catalyst thinner)
S 338-057-N00
(3) When the supplier's instructions are not used, use these steps to mix the materials and cast it in the molds as soon as possible:
(a)
Use a rigid blade that is not wood to fully mix part A until you get a constant mixture.
(b)
Fully mix the necessary quantity of part B and part C in a ratio of 1:1 by weight.
(c)
For the following Grades, mix part A and the mixture of part B and part C in the following ratios. 1) For Grade 30, fully mix one part of the mixture of part B
and part C, by weight, to 12.7 parts by weight of part A. 2) For Grade 32, fully mix one part of the mixture of part B and part C, by weight, to 7.7 parts by weight of part A.
(d)
Let the material you mixed stay for 10 minutes to get the correct density before you apply it.
NOTE: The pot life of the mixed material is 60 minutes at
____
70-90°F.
S 338-058-N00
(4) Cast the BMS 10-102 insulation coating material into the mold in a flat layer which is thicker than necessary.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 EXHAUST 1(86)
