S 845-027
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747-400 MAINTENANCE MANUAL
 S 845-028
 (3)  
Close the cargo door (AMM 52-34-01/401).

 S 865-029

 (4)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 25-53-00-705-030
 4. System Test - Cargo Handling System
___________________________________
 A. General
 (1)  This task is a test of the cargo handling system for the forward and the aft cargo compartment. Ignore the steps not applicable to the compartment being tested.
 B. Special Tools and Equipment
 (1)  
CF65B61160 Retractable Guide Rail Installation Checking Fixture

 (2)  
3PRE65B00040 Lower Cargo Door Opening Safety Barrier

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

 (2)  
AMM 52-34-00/001, Foward/Aft Cargo Doors

 D. Access
 (1)  Location Zones 121 Forward Cargo Container Compartment Fwd Half, Left 122 Forward Cargo Container Compartment Fwd Half, Right 123 Forward Cargo Container Compartment Aft Half, Left 124 Forward Cargo Container Compartment Aft Half, Right 141 Aft Cargo Container Compartment, Left 142 Aft Cargo Container Compartment, Right
 E. Prepare for System Test
 S 865-031
 (1)  Supply electrical power (AMM 24-22-00/201).
 S 015-032
 WARNING: DO A CHECK OF THE CARGO COMPARTMENT IF THE CAUTION LIGHT
_______ FLASHES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF THEY BLOCK THE OPERATION OF THE SYSTEM.
 (2)  Open the cargo compartment door (AMM 52-34-01/401).
 NOTE: Electrical power to the cargo drive system comes through
____ the cargo door UNLOCKED and UP switches. The cargo drive system will not operate unless the cargo door is fully open.
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MAINTENANCE MANUAL

 S 495-033
 WARNING:_______INSTALL THE SAFETY BARRIER CORRECTLY WHEN THE DOOR IS OPEN. IF YOU INSTALL THE SAFETY BARRIER INCORRECTLY, INJURIES TO PERSONNEL CAN OCCUR.
 (3)  Install the safety barrier for the cargo door if the door is open.
 F. Do a Test of the Lateral Guide Rail Operation
 S 715-034
 (1)  In the forward compartment, do the steps that follow:
 (a)  
Put the LATERAL GUIDE switch in the RETRACT BOTH position.

 (b)  
Make sure the forward and aft lateral guide rails retract and stay in that position.

 S 715-035
 (2)  In the aft compartment, do the steps that follow:
 (a)  
Put the LATERAL GUIDE switch in the RETRACT position.

 (b)  
Make sure the forward and aft lateral guide rail retract and stay in that position.

 S 225-036
 (3)  
On each guide rail make sure Dimension A is 0.80 (|0.06) inch (Fig. 502), or do a check for a go/no-go condition, using a check fixture tool.

 S 865-037

 (4)  
Put the LATERAL GUIDE switch in the NORMAL position.

 S 865-038

 (5)  
Put the joystick in the FWD or AFT position to extend the guide rails.

 (a)  Release the joystick to the center position when the lateral guides are fully extended.
 S 225-039
 (6)  
On each guide rail make sure Dimension B is 2.67 to 2.88 inches (Fig. 502), or do a check for a go/no-go condition, using a check fixture tool.

 S 715-040

 (7)  
In the forward compartment, do the steps that follow:

 (a)  Put the LATERAL GUIDE switch in the RETRACT FWD position for the aft compartment.
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