737-300 400 500 AMM 飞机维护手册 发动机燃油和控制(52)

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 d) Remove and discard the O-ring.
 e) Cover the new O-ring with petrolatum.
 f) Install a new O-ring.
 g) Apply 50-60 psi (345-414 kPa) dry air or nitrogen to
 the drain line.
 h) Turn off the pressure supply.
 i) Make sure the pressure does not decrease more than
 10 psi (69 kPa) in 2 minutes.
 6) If leakage occurs again, replace the fuel nozzle.
 a) Apply 50-60 psi (345-414 kPa) dry air or nitrogen to
 the drain line.
 b) Turn off the pressure supply.
 c) Make sure the pressure does not decrease more than
 10 psi (69 kPa) in 2 minutes.
 7) Install lockwire on the shroud connector to the fuel
 nozzle.
 (i)  If you cannot see the leakage at the fuel nozzle connections, do a check at 6 o'clock junction plate for leakage (Fig. 404):
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 ALL  ú ú C01 Page 424 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL NOZZLE
DRAIN LINE

FUEL NOZZLE
DRAIN LINE
SEE A
LOOKING UP
C FWD
B
6 O'CLOCK STRUT JUNCTION PLATE
6 O'CLOCK STRUT RIGHT FAIRING
SEE C
SEALANT FUEL NOZZLE DRAIN LINE
SEE B  SEALANT
SEE D
EXTENSION RING
LOWER FITTING

FWD
RIGHT OUTER SEALANT RING D
A
Fuel Nozzle Shroud Drain Line 6 O'Clock Strut Fitting Location Figure 404
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 73-11-04
 (WITH FUEL DRAIN MANIFOLDS)  ú ú C01 Page 425 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CAUTION: DO NOT CAUSE DAMAGE OR REMOVE SEAL AT THE UPPPER AND
_______ LOWER SURFACES OF THE STRUT FAIRING.
 1)  Remove 15 screws which attach the 6 o'clock strut right
 fairing half. 2) Remove the strut fairing from the engine. 3) Apply leak-tek to the connection at top of the strut to
 find the source of leakage.
 4)  Make sure the tube nut is tightened to the correct torque value and is not damaged. a) Tighten, repair or replace if it is necessary.
 5)  Install the strut fairing half:
 a)  Remove the old sealant from the strut fairing and mating surfaces on the extension ring and fan from strut.
 WARNING: DO NOT GET METHYL ETHYL KETONE (MEK) IN YOU 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 TO PERSONS AND DAMAGE TO EQUIPMENT.
 b) Clean and dry the surfaces with MEK.
 c) Install the strut fairing half with 15 screws.
 d) If the temperature of the sealing surfaces is below 50

 degree F (10 degree C), increase the temperature of the sealing surfaces with circulating warm air (not more than 120 degree F (50 degree C)).
 e)  Apply the primer with a brush or spray gun on all
 surfaces to be sealed. f) Permit a minimum of one hour for the primer to dry. g) Apply the sealant 93-006-1 to areas as shown in
 Fig. 404 (View D). h) Wipe the sealant to make it smooth. i) Let the sealant cure for 10 hours.
 NOTE: Ten hour cure time was calculated from the
____ conditions of 77 |2°F (25 |1°C) and 50 |5% relative humidity. You can decrease the cure time if you increase the temperature of the sealant surfaces or sealant with warm air (not more than 120°F [50°C]).
 (j) Remove the hose assembly for the air pressure test.
 G.  Put the Airplane Back to its Usual Condition
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