28-10-00
ALL ú ú 02 Page 235 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(a)
Start the ventilation blower before you put the air duct in the fuel tank.
(b)
For the main tank outboard of the engine, do these steps:
1) At the location where you will do maintenance, remove three adjacent access doors (AMM 28-11-11/401).
NOTE: Usually the middle access door is the door where you
____ will go into the fuel tank.
2) Install rubber protectors around the openings of the main tank access doors. 3) Install the access door adapter to the access door (the
outboard access door is the preferred door). 4) Bond the access door adapter to the airplane structure. 5) Make sure there will be a flow of air into the area where
you will do the maintenance.
(c) For the main tank inboard of engine, do these steps: 1) Remove the access door where you will do the maintenance (AMM 28-11-11/401). 2) Install rubber protectors around the openings of the main
tank access doors. 3) Put the air duct inside the open access door. 4) Use the pigtail on the end of the air duct to bond the air
duct to the airplane structure. 5) Make sure there will be a flow of air into the area where you will do the maintenance.
S 482-375
(4) After the air supply has operated for approximately 30 minutes, put the sampling line of the combustible gas indicator (Fig. 205) as far into the fuel tank as possible.
NOTE: It is recommended that you take the combustible gas indicator
____ value regardless of the type of fuel that was contained in the fuel tank. If the fuel tank had contained kerosene only, then the combustible gas indicator should show zero. This shows that the tank atmosphere is in fire-safe and health-safe condition.
S 482-376
(5) Wait one minute for each foot (300 mm) of sampling line before you take a reading.
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28-10-00
ALL ú ú 02 Page 236 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 482-377
(6) Use table below to convert the values on the combustible gas indicator to the actual levels.
NOTE: If you use a combustible gas indicator that is not listed
____ below, follow the manufacturer's instructions to get the actual values.
~................................................................. | COMBUSTIBLE GAS | FOR PPM MULTIPLY | FOR LEL, MULTIPLY | | INDICATOR | VALUE BY: | VALUE BY: | ................................................................... |GASTECH 1314 | 2 | 3 | ................................................................... |GASTECH 1314SMPN | 2 | 3 | ................................................................... |GASTECH GT SERIES | 2 | 3 | 2.....................….....................….....................1
S 492-378
WARNING: DO NOT USE A HEATER/AIR BLOWER UNTIL THE FUEL VAPOR
_______ CONCENTRATION IS 10% OR LESS OF THE LOWER EXPLOSIVE LIMIT AS SHOWN BY A COMBUSTIBLE GAS INDICATOR. IF THE FUEL VAPOR CONCENTRATION IS NOT 10% OR LESS OF THE LOWER EXPLOSIVE LIMIT, IGNITION OF THE FUEL VAPORS COULD OCCUR.
(7) When the combustible gas indicator shows the fuel vapor concentration is 10% or less of the lower explosive limit, you can put warm or cool air in the fuel tank through the tank access opening with an explosion-proof heater/air blower.
NOTE: The use of warm or cool air is for the comfort of
____ persons in the fuel tank. It is not part of the purging procedure.
S 492-379
WARNING: DO NOT STOP OR START THE HEATER/AIR BLOWER WHILE THE AIR DUCT
_______ IS IN THE FUEL TANK. THE FUEL VAPOR FROM THE FUEL TANK COULD CAUSE AN EXPLOSION AT THE HEATER OR BLOWER MOTOR. A FIRE OR EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
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