(2)
Two aft equipment/lavatory/galley vent fans
(3)
Two vent fan check valves.
NOTE: Vent fans with the electrical connector installed on the
____ top of the vent fan have an internal check valve which cannot be removed. Vent fans with the electrical connectors installed on the side of the vent fan have external check valves which can be removed.
2. Component Details
_________________
A. Aft Equipment/Lavatory/Galley Ventilation Fan
_____________________________________________
(1)
Physical Description
(a)
Two identical, redundant fans are located in the aft cargo compartment, just forward of the aft pressure bulkhead. The fans operate on 115v ac, 3 phase, 400Hz power.
(b)
The fans contain the components that follow: 1) An electric motor. 2) A thermal switch in each motor winding.
NOTE: The thermal switches open if a winding reaches
____ 400°F (218°C). The thermal switch resets when the winding cools to 340°F (180°C).
3) A single stage vane-axial blade.
4) VENT FANS WITH THE ELECTRICAL CONNECTOR ON THE TOP OF THE FAN; An internal check valve.
NOTE: The check valve prevents backflow through the valve.
____
B. GUN 001-010, 051, 101-104;
Fan Check Valve
_______________
(1)
Physical Description
(a)
A fan check valve is located just downstream of each aft equip/lav/galley vent fan. The valve consists of two semi-circular flapper doors attached to a centered hinge pin, and a torsional spring which closes the check valve.
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ALL ú ú 04A Page 1 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
AFT GALLEY LAVATORIES (EXAMPLE)
AFT EQUIP/LAV/GALLEY VENTILATION FANS
SEE B
AFT EQUIPMENT CENTER, E6
GALLEYS (EXAMPLE)
AFT EQUIP/LAV/GALLEY
LAVATORIES OR
AFT EQUIP/LAV/GALLEY
VENT FAN 1
GALLEYS (EXAMPLE)
VENT FAN 2
LAVATORIES (EXAMPLE) SEE A TO VENT SYSTEM CONDITIONED AIR INLET
MUFFLER
DOOR
VENTILATION LAVATORY AIR VENT
GRILLE UNDER TOILET SHROUD LAV/GALLEY VENT
CHECK VALVE
LAVATORY VENTILATION AFT EQUIP/LAV/GALLEY VENT FAN A
B
Ventilation System Figure 1
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21-26-00
EXTERNAL CHECK VALVES ú ú 03A Page 2 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
AFT GALLEY
LAVATORIES (EXAMPLE)
AFT EQUIPMENT CENTER, E6 VENTILATION FANS LAVATORY/GALLEY AFT EQUIPMENT/ SEE B
(EXAMPLE) GALLEYS
GALLLEYS (EXAMPLE) LAVATORIES OR LAVATORIES (EXAMPLE) SEE A VENT FAN 1 LAVATORY/GALLEY AFT EQUIPMENT/ VENT FAN 2 LAVATORY/GALLEY AFT EQUIPMENT/
AIR INLET CONDITIONED TO VENT SYSTEM
MUFFLER
DOOR VENTILATION LAVATORY AIR OUTBDLAVATORY/GALLEY VENT
GRILLE VENT UNDER CHECK VALVETOILET SHROUD
AFT EQUIPMENT/LAVATORY/GALLEY VENTILATION FANS LAVATORY VENTILATION (VIEW IN THE AFT DIRECTION)
A B
Ventilation System
Figure 1A
H52445
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21-26-00
INTERNAL CHECK VALVES ú ú 02A Page 3 ú May 28/99
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