747-400 AMM 飞机维护手册 大气 AIR 1(24)

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 S 034-004-N00
 (3)  Disconnect the electrical connector from the barometric switch. Refer to the table that follows for the correct equipment numbers:
 ~...................................... | | Equipment Number | | Strut ............................ | | Switch | Connector | ........................................ | 1 | S1622 | DS1622 | | 2 | S1623 | DS1623 | | 3 | S1624 | DS1624 | | 4 | S1625 | DS1625 | 2...........….............…............1
 S 034-018-N00
 (4)  Remove the barometric switch:
 (a)  
Remove the bolts and the washers that hold the barometric switch to the bracket.

 (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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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