ILF 402, 452, 509, 510, 523, 525-528, 568, 569, 576, 577, 581, 583, 585, 588-590, 592-599, 601-603, 606, 607,
610-615, 620, 625-627, 691-699, 833-835, 838, 971, 980-999; ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315,
317-319, 323, 331-399, 401, 405, 406, 409, 410, 412, 416, 424, 425, 427-429, 451, 501-504, 507, 508, 512-514,
516, 518, 524, 531-533, 535-537, 541, 542, 552-556, 560-562, 567, 571-575, 671, 672, 686, 703, 707-710, 803-813,
821, 822, 831, 832, 836, 837, 841, 842, 851, 852, 854-858, 861-863, 871-874, 947, 948, 968-970, 972, 973 POST
SB 737-47-1003 (Continued)
(b) If the L PACK selector switch is in the AUTO position and the NGS is operating, do these
steps:
1) Make sure that colleague is present to help you if necessary.
2) Do not go into the main wheel well area more than to waist level.
3) If there is an obvious NGS leak, get out of the wheel well and shut off the pneumatic
supply.
4) There are no restrictions if the NGS system is locked out.
H. Nitrogen Generation System Maintenance Precautions
SUBTASK 47-00-00-910-005
WARNING
DO NOT TOUCH THE COMPONENTS OF THE NITROGEN GENERATION
SYSTEM WHEN THEY ARE HOT. WHEN THE COMPONENTS ARE HOT,
THEY CAN CAUSE INJURIES TO PERSONNEL.
(1) Obey these precautions:
(a) Use caution and sufficient protection when you are near the Nitrogen Generation System
(NGS) components.
NOTE: The nitrogen generation equipment gets air from the wing bleed crossover duct.
The heat exchanger decreases the air temperature from 300°F (149°C) - 400°F
(204°C) to 160°F (71.1°C). A temperature of 160°F (71.1°C) will burn you if you
touch the components.
NOTE: After the NGS stops, it goes to the cool down mode. The cool down mode
prevents damage to the heat exchanger from the thermal shock of a fast cool
down. The cool down mode drives the OTSOV and the ram air valve closed, and
keeps the NGS shutoff valve open. After approximately 30 minutes, the NGS
shutoff valve closes and the ram air valve opens.
SUBTASK 47-00-00-910-006
WARNING
DO NOT DISCONNECT THE COMPONENTS OF THE NITROGEN
GENERATION SYSTEM, OR DUCTS WHEN THE SYSTEM IS PRESSURIZED.
THE HOT, HIGH-PRESSURE AIR CAN CAUSE INJURIES TO PERSONNEL,
AND DAMAGE TO EQUIPMENT.
(2) Make sure that you remove the bleed air source and release pressure before you disconnect
the system components or ducts.
NOTE: The bleed air source gives high pressure air to the thermal control unit (TCU)
components.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 206
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF 402, 451, 452, 494-500, 503, 504, 509, 510, 514, 523-528, 541, 560-564, 567-569, 574-577, 581, 583, 585,
588-590, 592-599, 601-603, 606, 607, 610-615, 620, 625-627, 671, 672, 691-699, 832-835, 838, 856-858, 947,
948, 968-973, 980-999; ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 401, 405,
406, 409, 410, 412, 416, 424, 425, 427-429, 501, 502, 507, 508, 512, 513, 516, 518, 531-533, 535-537, 542,
552-556, 571-573, 686, 703, 707-710, 803-813, 821, 822, 831, 836, 837, 841, 842, 851, 852, 854, 855, 861-863,
871-874 POST SB 737-47-1002 OR POST SB 737-47-1003 OR POST SB 737-47-1015; ILF 491-493, 515,
519, 520, 530, 557, 559 POST SB 737-47-1002 OR POST SB 737-47-1015
To Next Page
Loading...
