(2)
All conditions of the test must be completed satisfactorily.
B. References
(1)
12-31-01/201, Zone Diagrams
(2)
12-31-31/201, Body Station 46 Access Doors and Panels
(3)
24-22-00/201, Manual Control
C. Access
(1)
Location Zone (Ref 12-31-01/201)
(a)
210, Air-Conditioning Distribution Bay
(b)
212, Left Air-Conditioning Access Panel
(c)
214, Right Air-Conditioning Acess Panel
(2)
Access Panels (Ref 12-31-31/201)
(a)
3303 - Left Air-Conditioning Access Panel
(b)
3403 - Right Air-Conditioning Access Panel
D. Prepare For The Recirculation Fan System Operational Test
S 865-002
(1)
Supply electrical power to the airplane (Ref 24-22-00/201).
S 865-003
(2)
Make sure these circuit breakers are CLOSED:
(a) P6-4 Load Control Circuit Breaker Panel 1) CABIN AIR RECIRC FAN 2) RECIRC FAN CONT 3) RECIRC FAN ENERGIZED 4) L PACK VALVES
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
Recirculation Fan Circuit
Figure 501
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
5) R PACK VALVES
S 865-004
(3) Set these switches as follows:
(a) P5-10 Air-Conditioning Module
1) L PACK - AUTO
2) R PACK - AUTO
3) RECIRC FAN - OFF
4) BLEED 1 - ON
NOTE: The BLEED 1 switch must be set to the ON position
____ if the flaps are not up. If the flaps are up, the BLEED 1 switch set to the ON position is not necessary.
S 015-005
(4) Lower these access panels:
(a)
3303 - Left Air-Conditioning Access Panel
(b)
3403 - Right Air-Conditioning Access Panel
S 015-023
(5) Remove this access panel:
(a) Access Panel, Right - Forward Cargo Compartment, Aft Bulkhead
E. Procedure
S 715-006
(1) Do an operational test of the recirculation fan system:
(a)
Set the RECIRC FAN switch to the AUTO position. 1) Make sure the recirculation fan operates.
(b)
Disconnect the D486 electrical connector from the left pack flow control and shutoff valve (L Pack Valve). 1) Make sure the recirculation fan continues to operate.
(c)
Disconnect the D490 electrical connector from the right pack flow control and shutoff valve (R Pack Valve). 1) Make sure the recirculation fan continues to operate.
(d)
Set the R PACK switch to the HIGH position.
1) Make sure the recirculation fan stops.
(e)
Set the R PACK switch to the AUTO position. 1) Make sure the recirculation fan operates.
(f)
Set the L PACK switch to the HIGH position.
1) Make sure the recirculation fan stops.
(g)
Set the L PACK switch to the AUTO position. 1) Make sure the recirculation fan operates.
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