(b)
Remove the barometric switch from the nacelle strut.
(c)
Install covers to prevent contamination to the electrical connector and the receptacle on the barometric switch.
TASK 75-23-04-404-008-N00
3. Barometric Switch Installation (Fig. 401)______________________________
A. Standard Tools and Equipment
(1) Gun - Heat, 120°F (50°C) maximum temperature output
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(2)
Brush - Stiff, bristle, non-metallic
B.
Consumable Materials
(1)
G00033 Cheesecloth - Woven, BMS 15-5, Type A
(2)
B00448 Solvent - 1,1,1 Trichloroethane Inhibited, 0-T-620
(3)
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
(4)
A00251 Sealant, BMS 5-26, Type II, Class B-2
(5)
C00259 Enamel - BMS 10-11, Type II
C.
References
(1)
AMM 06-09-09/201, Nacelle and Engine-to-Wing Fairing Access Doors and Panels
(2)
IPC 75-23-51 Fig. 1
(3)
WDM 75-23-11, 75-23-21
(4)
SSM 75-23-01
D.
Access
(1)
Location Zone
451 Strut No. 1 - Forward Fairing
461 Strut No. 2 - Forward Fairing
471 Strut No. 3 - Forward Fairing
481 Strut No. 4 - Forward Fairing
(2)
Access Panel
451AR TAI Valve Access Door - Strut 1
461AR TAI Valve Access Door - Strut 2
471AR TAI Valve Access Door - Strut 3
481AR TAI Valve Access Door - Strut 4
E.
Procedure
S 114-020-N00
(1)
Clean the surfaces that seal for the barometric switch:
(a)
Remove the used sealant from the bracket and the barometric switch if it is not new:
WARNING: DO NOT GET THE SOLVENT IN YOUR MOUTH OR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE SOLVENT. PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVES WHEN YOU USE THE SOLVENT. KEEP THE SOLVENT AWAY FROM SPARKS, FLAME, AND HEAT. THE SOLVENT IS A POISONOUS AND FLAMMABLE MATERIAL WHICH CAN CAUSE INJURY OR DAMAGE.
1) Clean the two surfaces with a clean, bristle brush (or cheesecloth) that is soaked with trichloroethane inhibited solvent or Methyl Ethyl Ketone (MEK).
NOTE: When you apply the solvent, do not use too much.
____
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2) Dry the two surfaces with a cloth.
(2) S 434-019-N00Install the barometric switch: (a) Align the bolt holes on the barometric switch and the bracket. (b) Install the bolts and the washers. 1) Tighten the bolts.
(3) S 394-021-N00Apply a fillet seal between the edges of the barometric switch and the bracket: (a) If the temperature of the surfaces that will be sealed is less than 50°F (10°C), increase the temperature of the surfaces with a heat gun with a maximum temperature of 120°F (50°C) (AMM 20-11-25/201). 1) Use the sealant to apply a 0.1 inch (2.5 mm) thick seal between the surfaces of the barometric switch and the bracket. 2) Give the seal a 48 hour cure time.
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