(a)  
S2089, Ground Test Enable Switch (P461)

 (b)  
S2090, Remote Test Enable Switch (RCDU).

 F.
Put the Airplane Back to Its Usual Condition

 (1)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 845-020
 TASK 26-16-00-735-022
 3. System Test
___________
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A
747-400 MAINTENANCE MANUAL
 NOTE: The System Test includes the following tasks procedures:
____ Two Connector Disconnected Test One Connector Disconnected Test Ejector Test Airflow Test for the Forward Cargo Sampling Tube Vacuum Supply Tube Replacement Test Heater Check (COMBIS and PASSENGER airplanes with Heaters) Smoke Test
 A. Special Tools and Equipment
 (1)  
Rosco Fog/Smoke Machine - Model 1600 or equiv
 Rosco Laboratories Inc.
 52 Harbor View Ave
 Stamford, CT 06902
 Phone number: (800) 767-2669 or (203)-709-8000
 Fax: (203) 709-8919

 (2)  
Ventilation Smoke Tube (Part #458481)
 Mine Safety Appliance Co.

 P.O. Box 426
 Pittsburgh, PA 15230
 Phone number: (412) 967-3000
 FAX number: (412) 967-3161

 (3)  
Hot Wire Anemometer (Air Velocity Meter) - Model 1650, 8350, 8352, 8355, 8357, or 8360 TSI Incorporated 500 Cardigan Road Shoreview, Minnesota 55216 Mailing Address: P.O. Box 64394

 St. Paul, Minnesota 55164
 Telephone Number: 800-876-9874
 Fax Number: 612-490-2874

 (4)  
G26005 - Adaptor, Hot Wire Anemometer
 Boeing

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A
747-400
MAINTENANCE MANUAL

 B. Standard Tools and Equipment
 (1)  
Vacuum Gauge - hand held, 0-180 inches of water (0-15 inches of mercury)

 C.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 36-00-00/201, Pneumatic System

 (3)  
AIPC 26-16-01, Fig. 1

 (4)  
AIPC 26-16-01, Fig. 2

 (5)  
WDM 26-16-11 through WDM 26-16-16

 D.
Access

 (1)  
Location Zones
 122 Forward Cargo Compartment Forward Half RH
 142 Aft Cargo Compartment RH
 221 Control Cabin LH
 222 Control Cabin RH

 E.
Prepare for System Test

 S 865-023
 (1)  Open these circuit breakers on the main power distribution panel, P6, and attach DO-NOT-CLOSE tags:
 (a)  
6H1, FIRE EXTINGUISHER ENG 1&3 B

 (b)  
6H2, FIRE EXTINGUISHER ENG 1&3 A

 (c)  
6H3, FIRE EXTINGUISHER ENG 2&4 B

 (d)  
6H4, FIRE EXTINGUISHER ENG 2&4 A

 (e)  
6H5, FIRE EXTINGUISHER APU

 (f)  
6H6, FIRE EXTINGUISHER LOWER CARGO

 (g)  
6H7, FIRE SW UNLOCK

 S 865-025
 (2)  Close these circuit breakers on the overhead circuit breaker panel, P7:
 (a)  
7F23, LANDING GEAR DSP & CONT ALTN

 (b)  
7H14, CARGO SMOKE DETECT LWR A

 (c)  
7H15, CARGO SMOKE DETECT LWR B

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