B. When you replace or install components on the lighting systems in fuel vapor areas, seal these open items:
-Lamp terminals
-Terminal strips
-Circuit breakers
-Transformers
-Switches
-Hardwire
-Wire junctions.
Lamp terminals with a rubber sleeve are open.
C. Do not seal the dual grounds in fuel vapor areas or the wire junctions in fuel tanks.
D. Do not seal the generator terminals on the engines or APU.
E. Install wire and protectors on all secondary switch leads and seal all secondary switch terminals in the fuel vapor areas. Insulated splices are not open.
F. To identify fuel vapor areas, see Fig. 201.
TASK 20-10-47-392-006
2. Seal the Open Terminals
_______________________
A. Equipment
(1) Paint brush, 1-inch wide - Commercially
available
B. Consumable Materials
(1)
B00083 Aliphatic Naphtha - TT-N-95
(2)
Use the sealants in Table 1.
............................................................... SEALANT |
............................................................... BMS 5-26 TYPE II | BMS 5-37 | BMS 5-95 | BMS 5-142 |
| ..............................…................................ TABLE 1
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A
737-300/400/500MAINTENANCE MANUAL
C. Procedure
S 112-002
(1) Remove all dirt and grease for a minimum of one inch adjacent to the area you will seal. Use a cloth made moist with Naphtha.
S 392-004
CAUTION: DO NOT SEAL THE SHANK OF LAMP TERMINALS THAT ARE A
_______ SPRING-LOADED PART OF THE BAYONET LAMP SOCKET BASE. SEAL ONLY THE TERMINAL END AND ATTACHED HARDWARE. SEALANT ON THE SHANK LIMITS MOVEMENT OF THE LAMP CONTACT WHICH CAN CAUSE THE LIGHT ASSEMBLY TO BECOME TOO HOT. IF IT BECOMES TOO HOT, A FAILURE CAN OCCUR.
(2)
Apply one layer of sealant to the open areas. Make sure you seal all the open areas.
S 392-005
(3)
On ring torque terminals, apply sealant as follows:
(a)
Apply sealant to the side of the terminal which a metal object can hit if it falls (Fig. 202).
NOTE:____Seal each terminal as far as the attached hardware. You can fully seal the attached hardware. If there are barriers between phases or between components, the seal must extend into the space given protection by the barriers.
(b)
If the edges of the terminals are less than 0.5 inch from each other, apply sealant to the edges.
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A 737-300/400/500MAINTENANCE MANUAL
WHEEL WELL
LEADING EDGE AREA TRAILING EDGE AREA
ENGINE STRUT
LEGEND:
FUEL VAPOR AREA
Fuel Vapor Areas
Figure 201
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A 737-300/400/500MAINTENANCE MANUAL
SEAL ALL OPEN METAL ON THIS SIDE
Sealant Installation on Ring Tongue Terminals
Figure 202
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