S 424-028
 (1)  
Put the fan (9) into position in the duct so that the flow arrow on the fan points aft.

 (2)  
Pull one sleeve (8) over each duct-fan joint.

 S 434-030

 (3)  
Install the bolt (1), washer (2), and nut (3) that attach the top fan bracket (4) to the rod support (5). Do not tighten.

 S 434-031

 (4)  
Install the bolts (11), washers (12), nuts (13), and isolators (14) that attach the lower fan bracket (10) to the fan support. Do not tighten.

 S 434-029
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757 MAINTENANCE MANUAL
 S 434-032
 (5)  
Install the bolt (16), washers (17), and nut (18) that attach the jumper assembly (15) to the fan (9).

 S 434-033

 (6)  
Tighten all the nuts.

 S 434-034

 (7)  
Install the clamps (7) on each end of the fan. Tighten the clamp screws to 20-25 pound inches.

 S 434-055

 (8)  
Connect the electrical connector (6) to the fan (9).

 E.
Install the left recirculation air fan

 S 424-035
 (1)  
Put the fan (32) into position in the duct so that the flow arrow of the fan points aft.

 S 434-036

 (2)  
Pull one sleeve (30) over each duct-fan joint.

 S 434-037

 (3)  
Install the eye-bolt (20), washer (21), nut (22), and isolator (23) that attaches the rod support (19) to the top of the fan (32). Do not tighten.

 S 434-038

 (4)  
Install the bolts (27), washers (28), nuts (29), and isolators (26) that attach the fan (32) to the inboard and outboard fan brackets (37,25). Do not tighten.

 S 434-039

 (5)  
Install the bolt (34), washer (35), and nut (36) that attaches the jumper assembly (33) to the fan (32).

 (6)  
Tighten all the nuts.

 S 434-041

 (7)  
Install the clamps (24) on each end of the fan. Tighten the clamp screws to 20-25 pound inches.

 S 434-040
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757 MAINTENANCE MANUAL
 S 434-054
 (8)
Connect the electrical connector (31) to the fan (32).

 F.
Do the recirculation fan installation test

 S 864-042
 (1)  If the right cabin air recirculation fan was installed, remove the DO-NOT-CLOSE identifier and close these circuit breakers:
 (a) (b)  On the pilot's-overhead-circuit-breaker panel (P11): 1) 11P23, RECIRC CARGO FIRE CONT RIGHTOn the miscellaneous-electrical-equipment-panel (P37): 1) 37J5, RECIRC FAN R
 S 864-043
 (2)  If the left cabin air recirculation fan was installed, remove the DO-NOT-CLOSE identifier and close these circuit breakers:
 (a) (b)  On the pilot's-overhead-circuit-breaker panel (P11): 1) 11P14, RECIRC CARGO FIRE CONT LEFTOn the miscellaneous-electrical-equipment panel (P70): 1) 70C10, RECIRC FAN L
 S 864-045
 (3)  Supply the electrical power (AMM 24-22-00/201).
 S 864-046
 (4)  Push the applicable (L or R) RECIRC FAN switch/light, on the pilot's-overhead-control-panel P5, to the ON position.
 S 714-048
 (5)  Listen for the fan to operate.
 S 794-049
 (6)  Make sure that air does not leak from around the fan-duct joints. (a) A small leak is permitted. (b) You must repair a large leak.

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