C.
Operational Test Procedure

 S 715-008
 (1)  Do the Ventilation System Operational Test.
 CAUTION: IF THE VENT FAN 1 IS ON AND NO AIRFLOW IS FELT AT THE FAN
_______ 1 OUTLET, IMMEDIATELY OPEN THE CIRCUIT BREAKER 37D5, AFT EQPT COOLING FAN EXH 1, ON THE P37 PANEL. FAILURE TO OPEN THIS CIRCUIT BREAKER MAY CAUSE DAMAGE TO THE FAN.
 (a)  
Make sure the vent fan 1 is on.

 (b)  
Feel for airflow from the fan 1 outlet.

 (c)  
Make sure the air does not flow into the fan 2 outlet.

 (d)  
Do the EICAS Maintenance Message Erase procedure (AMM 31-41-00/201).

 (e)  
Make sure these EICAS messages do not show on the lower display when the EICAS COMPUTER switch is in the L and R position. 1) AFT EQ EXH FAN 1 2) AFT EQ EXH FAN 2

 (f)  
Open this circuit breaker on the P37 panel:
 1) 37D5, AFT EQPT COOLING FAN EXH NO. 1

 (g)  
Make sure the vent fan 1 goes off and vent fan 2 comes on.

 CAUTION: IF THE VENT FAN 2 IS ON AND NO AIRFLOW IS FELT AT THE FAN
_______ 2 OUTLET, IMMEDIATELY OPEN THE CIRCUIT BREAKER 70B2, AFT EQPT COOLING FAN EXH 2, ON THE P70 PANEL. FAILURE TO OPEN THIS CIRCUIT BREAKER MAY CAUSE DAMAGE TO THE FAN.
 (h)  
Feel for airflow from the fan 2 outlet.

 (i)  
Make sure the air does not flow into the fan 1 outlet.

 (j)  
Make sure the EICAS message AFT EQ EXH FAN 1 shows on the lower display with the EICAS COMPUTER select switch in the L and R positions.

 (k)  
Open this circuit breaker on the P70 panel:
 1) 70B2, AFT EQPT COOLING FAN EXH NO. 2

 (l)  
Make sure the EICAS message AFT EQ EXH FAN 2 shows on the lower display with the EICAS COMPUTER select switch in the L and R positions.

 (m)  
Close this circuit breaker on the P37 panel:
 1) 37D5, AFT EQPT COOLING FAN EXH NO. 1

 (n)  
Close this circuit breaker on the P70 panel:
 1) 70B2, AFT EQPT COOLING FAN EXH NO. 2

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 (o)  
Do the EICAS Maintenance Message Erase procedure (AMM 31-41-00/201).

 (p)  
Make sure these EICAS messages do not show on the lower display when the EICAS COMPUTER switch is in the L and R position. 1) AFT EQ EXH FAN 1 2) AFT EQ EXH FAN 2

 D.
Put the Airplane Back to Its Usual Condition

 S 415-009
 (1)  
Install the aft bulkhead lining in the bulk cargo compartment (AMM 25-50-03/401).

 S 415-010

 (2)  
Close the aft cargo door, 822 (Ref 06-46-00).

 S 415-011

 (3)  
Close the access door for the main equipment center, 119BL (Ref 06-41-00).

 S 865-012

 (4)  
Remove the electrical power if it is not necessary (Ref 24-22-00).

 TASK 21-26-00-705-014
 3.  Lavatory/Galley Ventilation Health Check (Fig. 502)________________________________________
 A. General
 (1)  
This task has the steps to determine if the lavatory and galley vents have an adequate flow rate. In normal operation, the lavatories have negative pressure relative to the passenger cabin. When the vents become clogged, the lavatory and galley air will not be discarded overboard.

 B.
Equipment

 (1)  
Air Velocity Meter (10 to 1000 feet per minute range), TSE Velocicalc 8350 or equivalent

 C.
References

 (1)  
AMM 06-41-00/201, Fuselage, Access Doors, and Panels

 (2)  
AMM 21-26-03/401, Galley Ventilation Filter

 (3)  
AMM 24-22-00/201, Electrical Power Control

 (4)  
AMM 38-32-01/401, Toilet Tank

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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