S 862-033

 (18)
 Remove electrical power (AMM 24-22-00/201) if it is not necessary.

 TASK 26-16-05-702-034
 3.  Flapper Valve Check (Fig. 201)___________________
 A. References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 26-16-02/401, Smoke Detector Blowers

 (3)  
AMM 52-34-00/201, No. 1 and No. 2 Cargo Doors

 B. Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 121/122 Forward Cargo Compartment
 153/154 Aft Cargo Compartment
 211/212 Flight Compartment
 820 Lowr Half of Fuselage (RH side)

 (2)  
Access Panels
 821 Forward Cargo Compartment Door
 822 Aft Cargo Compartment Door
 823 Bulk Cargo Compartment Door

 C. Prepare to Do the Check
 S 862-035
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 752-036

 (2)  
Make sure these circuit breakers on the Miscellaneous Electrical Equipment panel, P70, are closed:

 (a)  70B10, SMOKE DET BLOWER 1
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757 MAINTENANCE MANUAL
 (b)  
70B11, SMOKE DET BLOWER 2

 (c)  
70B12, SMOKE DET BLOWER 3

 (d)  
70B13, SMOKE DET BLOWER 4

 S 012-091
 (3)  Open cargo door (AMM 52-34-00/201).
 D. Do the procedure for the Forward Cargo Compartment
 S 752-037
 (1)  
Make sure that Smoke Detector Blower 1 (M10462) operates.

 S 032-038

 (2)
Remove the screws which hold Smoke Detector Blower 2 (M10463).

 S 012-039

 (3)  
To get access to the flapper valve remove Smoke Detector Blower 2. Be careful not to disconnect or cause kinks in the hoses.

 S 752-040

 (4)  
Make sure the open end around the flapper valve is free of dirt which would prevent a correct position of the valve.

 S 752-041

 (5)  
Make sure there is no deterioration of the valve.

 S 862-042

 (6)  
Move the valve from side to side to the direction of the open end. Make sure the valve is in the correct position and that it can move freely.

 S 422-043

 (7)  
Install smoke detector blower 2 and use the screws which were removed.

 S 862-044

 (8)  
Open this circuit breaker on the P70 panel:

 (a)  70B10, SMOKE DET BLOWER 1

 (9)  
Make sure Smoke Detector Blower 2 (M10463) operates.

 (10)
 Remove the screws which hold Smoke Detector Blower 1 (M10462).

 S 012-047

 (11)
 To get access to the flapper valve remove Smoke Detector Blower.  Be careful not to disconnect or cause kinks in the hoses.

 S 752-048

 (12)
 Make sure the open end around the flapper valve is free of dirt which will prevent a correct position of the valve.

 S 752-045
 S 032-046
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757 MAINTENANCE MANUAL
 S 862-049
 (13)
 Move the valve from side to side to the direction of the open end. Make sure the valve is in the correct position and that it can move freely.

 S 422-050

 (14)
 Install Smoke Detector Blower 1 and use the screws which were removed.

 S 862-051

 (15)
 Close these circuit breakers on the P70 panel:

 (a)  70B10, SMOKE DET BLOWER 1
 S 862-052
 (16) Open and then close these circuit breakers on the P70 panel to set the smoke detector blower system:
 (a)  11S35, FIRE DET CARGO CONT or CARGO SMOKE BLOWER CONT
　
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