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73-11-04
ALL ú ú C01 Page 419 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 794-022-C00
(9) ENGINES PRE-CFMI-SB 73-116 (ENGINES WITH FUEL DRAIN MANIFOLDS); Do a check of the fuel supply line to the fuel nozzles and the coupling nuts on the drain manifold for leakage as follows:
(a)
Leakage is not permitted.
(b)
If leakage occurs, do these steps: 1) Loosen the coupling nut. 2) Do a check on the nut ferrule and seat. 3) If you do not find the damage, do these steps again.
a) Apply leak-tek to the coupling nut at the fuel nozzle. b) Apply 15 psi (104 KPa) minimum dry air or nitrogen. c) Do a check at the fuel supply line to fuel nozzle and
at coupling nuts used to drain manifold for leakage.
(c)
If the leakage occurs again, install the the metal conical seal on the fuel nozzle fitting. 1) Apply leak-tek to the coupling nut at the fuel nozzle. 2) Apply 15 psi (104 KPa) minimum dry air or nitrogen. 3) Do a check at the fuel supply line to fuel nozzle and at
coupling nuts used to drain manifold for leakage.
(d)
If leakage occurs again, replace the fuel nozzle. 1) Apply leak-tek to the coupling nut at the fuel nozzle. 2) Apply 15 psi (104 KPa) minimum dry air or nitrogen. 3) Do a check at the fuel supply line to fuel nozzle and at
coupling nuts used to drain manifold for leakage.
(e)
Make sure the fuel nozzle check valves are closed. 1) Pressurize and hold 10-15 psig (69-103 kPa gage) to the
manifold. 2) Turn off the dry air or nitrogen pressure supply. 3) Make sure the pressure does not decrease more than 5 psig
(34.5 kPa gage) in 3 minutes.
S 794-024-C00
(10) ENGINES POST-CFMI-SB 73-116 (ENGINES WITHOUT FUEL DRAIN MANIFOLDS); Do a check of the fuel supply line to the fuel nozzles as follows:
(a) Leakage is not permitted.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
73-11-04
ALL ú ú C02 Page 420 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(b) If leakage occurs, do these steps:
1) Loosen the coupling nut.
2) Do a check on the nut ferrule and seat.
3) If you do not find the damage, do these steps:
a) Apply leak-tek to the coupling nut at the fuel nozzle. b) Apply 15 psi (104 KPa) minimum dry air or nitrogen. c) Examine the fuel supply line to the fuel nozzle for
leakage.
(c)
If the leakage occurs again, install the the metal conical seal on the fuel nozzle fitting. 1) Apply leak-tek to the coupling nut at the fuel nozzle. 2) Apply 15 psi (104 KPa) minimum dry air or nitrogen. 3) Examine the fuel supply line to the fuel nozzle for
leakage.
(d)
If leakage occurs again, replace the fuel nozzle. 1) Apply leak-tek to the coupling nut at the fuel nozzle. 2) Apply 15 psi (104 KPa) minimum dry air or nitrogen. 3) Examine the fuel supply line to the fuel nozzle for
leakage.
(e)
Make sure the fuel nozzle check valves are closed. 1) Pressurize and hold 10-15 psig (69-103 kPa gage) to the
manifold. 2) Turn off the dry air or nitrogen pressure supply. 3) Make sure the pressure does not decrease more than 5 psig
(34.5 kPa gage) in 3 minutes.
S 434-025-C00
(11)
Make sure all the coupling nuts of the fuel nozzles have been triple tightened if they have been loosened for the leak check.
S 794-023-C00
(12)
If there are no leaks, do these steps:
(a) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 发动机燃油和控制(50)
