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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(h)
Apply a thin, constant finish (approximately 50 grams for each square foot) of the mixed material on each mating surface. Use a spreader that has serrations to apply the adhesive on a large mating surface.
(i)
Make sure the adhesive has a sufficient thickness. The adhesive must flow around the edges of the rub pad when you apply the cure pressure.
(j)
Do these steps to assemble the parts in less than 2 hours after you mix the B-2 material or in less than 20 minutes after you mix the B-1/2 material: 1) Put the rub pad in its position. 2) Use a clean roller or rub the surface with a clean
cheesecloth to remove the air caught between the surfaces.
NOTE: Too much pressure can push the adhesive out from the
____
rub pads.
3) Remove the unwanted adhesive with a clean cheesecloth that is moist with MEK. Do not let the solvent go into the bond line.
4) Let the adhesive dry for 10 minutes before you apply the cure pressure.
5) Apply the cure pressure equally to the part in less than
3.0 hours after you mix the B-2 material or in less than
1.0 hour after you mix the B-1/2 material.
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ALL ú ú B01 Page 804 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
6) Cure the phenolic pads that are bonded to aluminum surfaces at a constant pressure of 5 to 14 PSI. Refer to the subsequent charts.
~................................................. | | Hours After You Apply | | | the Cure Pressure | | ........................... | Cure Temperature | Adhesive | Adhesive | | (°F) | Class B-1/2 | Class B-2 | ................................................... | 77 |5 | 45 | 72 | | 72 |5 | 68 | 108 | | 67 |5 | 90 | 144 | | 62 |5 | 135 | 216 | | 115 |5 *[2] | 12 *[2] | 18*[2]| | 185 |5 *[1] | 0.75 *[1] | 0.75*[1]| | Bond line Temperature | | | | Below the Cure | | | | Pressure | | | 2.......................….............…...........1
*[1] More time on the cure pressure is necessary to heat the adhesive from 70 degrees to 180 degrees F.
*[2] Optional cure temperature and time. You can use the optional cure temperature and time with Pro Seal 890 only.
(k) Remove the unwanted cure adhesive with a hardwood or plastic wedge.
WARNING: DO NOT GET METHYL ETHYL KETONE (MEK) IN YOUR MOUTH OR
_______ EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM MEK. PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVES WHEN YOU USE MEK. KEEP MEK AWAY FROM SPARKS, FLAME, AND HEAT. MEK IS A POISONOUS AND FLAMMABLE SOLVENT WHICH CAN CAUSE INJURY OR DAMAGE.
(l) Remove the remaining adhesive from the aluminum surface with a clean cheesecloth that is moist with MEK.
D. Procedure - Repair Bonded Phenolic Rub Pads (No Heat Source Available)
S 348-004-B00
(1)
Refer to the steps in the first procedure to apply the adhesive on the mating surfaces.
S 868-006-B00
(2)
Do these steps to apply a new pad:
(a)
Mix 22 |2 parts (by weight) of BMS 5-26, Pro Seal 890 B-2 with activator, to 100 parts (by weight) of the base component.
(b)
To install the new rub strip on the assembly, do these steps: 1) Make sure the mating surfaces are clean.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú B01 Page 805 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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