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MAINTENANCE MANUAL
MIX MANIFOLD (REF)
CHECK VALVE
AIRPLANE SKIN (REF)
GROUND CONDITIONED FAIRING (REF) AIR CONNECTOR
FWD
GROUND CONDITIONED AIR CONNECTOR D
LEFT RECIRCULATION AIR FAN
EXHAUST FLOW
SUPPLY FLOW
UP
OVERBOARD
EXHAUST VALVE
FORWARD EQUIPMENT FWD
COOLING SUPPLY FANS
VALVE POSITION (REF)
INDICATOR
FORWARD EQUIPMENT COOLING EQUIPMENT
E
Recirculation System Adjustment Test
Figure 501 (Sheet 2)
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757 MAINTENANCE MANUAL
(b)
Put a DO-NOT-OPERATE tag on the selectors.
D.
Do the Test for the Left Recirculation System
S 865-008
CAUTION: IF THE LEFT RECIRC FAN IS ON BUT NO AIRFLOW IS FELT AT THE MIX
_______ MANIFOLD, IMMEDIATELY PUSH THE L RECIRC FAN SWITCH-LIGHT TO THE OFF POSITION. THIS WILL PREVENT DAMAGE TO THE FAN.
(1)
Push the L RECIRC FAN switch-light, on the P5 panel, to the on position.
(a)
Make sure the ON light comes on.
S 215-009
(2)
Feel for the airflow at the overboard exhaust valve (Ref 21-58-05).
S 215-010
(3)
Feel for the airflow in the mix manifold.
(a)
Open the access panel for the ground connector, 193DL (Ref 06-41-00).
(b)
Open the check valve for the conditioned air (AMM 21-21-00/401).
(c)
Feel for the airflow in the mix manifold.
S 865-011
(4)
Open this circuit breaker, on the P70 panel:
(a)
70C10, RECIRC FAN L
S 215-012
(5)
Make sure the L RECIRC FAN INOP light, on the P5 panel, comes on.
S 215-013
(6)
Make sure the EICAS advisory message L RECIR FAN shows on the upper display.
S 865-014
(7)
Close this circuit breaker, on the P70 panel:
(a)
70C10, RECIRC FAN L
(8)
Make sure the L RECIRC FAN INOP light goes off.
S 215-016
(9)
Make sure the EICAS advisory message L RECIR FAN does not show on the upper display.
S 865-017
(10)
Push the L RECIRC FAN switch-light, on the P5 panel, to the off position.
(a)
Make sure the INOP light comes on.
E.
Do the Test for the Right Recirculation System
S 215-015
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MAINTENANCE MANUAL
S 865-018
CAUTION:_______ IF THE RIGHT RECIRC FAN IS ON, BUT NO AIRFLOW IS FELT AT THE
PASSENGER CABIN OUTLET, IMMEDIATELY PUSH THE R RECIRC FAN
SWITCH-LIGHT TO THE OFF POSITION. THIS WILL PREVENT DAMAGE TO
THE FAN.
(1)
Push the R RECIRC FAN switch-light, on the P5 panel, to the on position.
(a)
Make sure the ON light comes on.
S 865-019
(2)
Open this circuit breaker on the P37 panel:
(a) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 空调 AIR CONDITIONING 1(59)
