(e)  
6H5, FIRE EXTINGUISHER APU

 (f)  
6H6, FIRE EXTINGUISHER LOWER CARGO

 (g)  
6H7, FIRE SW UNLOCK

 S 865-251
 (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

 E.
Do the following steps:

 (1)  
Pressurize the pneumatic crossover duct (AMM 36-00-00/201).

 S 865-187
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747-400 MAINTENANCE MANUAL
 NOTE: To verify the FWD detection system use the FWD switch
____
 position/displays in the following steps.

 S 725-189
 WARNING: DO NOT BREATHE THE SMOKE.  IF YOU USE THE
_______USE EYE PROTECTION. VENTILATION SMOKE TUBE, DO NOT LET THE SMOKE TOUCH YOUR SKIN. TOO MUCH SMOKE FROM THE SMOKE TUBE CAN CAUSE CORROSION TO THE MATERIALS IN THE SMOKE DETECTION SYSTEM. IF THERE IS NOT SUFFICIENT AIR MOVEMENT IN THE AREA OR YOU GET RESPIRATORY PROBLEMS, USE AN APPLICABLE RESPIRATOR. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (2)  
Use one of the smoke sources shown in Special Tools and Equipment and apply smoke adjacent to the orifice at STA 920, LBL 44.0 (STA 2125, LBL 36.0) in the forward (aft) compartment.

 S 735-062

 (3)  
Make sure the conditions that follow occur:

 (a)  
On the pilot's overhead panel, P5, the red cargo fire FWD (AFT) warning light is on.

 (b)  
On the main instrument light shield, the red master WARNING lights are on.

 (c)  
The alarm bell is on.

 (d)  
The EICAS message, FIRE CARGO FWD (FIRE CARGO AFT), shows on the EICAS display.

 (4)  
Remove the smoke source.

 S 735-064

 (5)  
Make sure these conditions occur after the smoke is gone from the area around the orifice:

 S 865-063
 (a)  On the pilot's overhead panel, P5, the red cargo fire FWD (AFT) warning light goes off.
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747-400 MAINTENANCE MANUAL
 (b)  
On the main instrument light shield, the red master WARNING lights go off.

 (c)  
The alarm bell is not on.

 (d)  
The EICAS message, FIRE CARGO FWD (FIRE CARGO AFT), does not show on the EICAS display.

 S 865-220
 (6)  
Apply smoke adjacent to the orifice at STA 480, LBL 44.0 (STA 1540, LBL 44.0) in the forward (aft) compartment.

 S 735-193

 (7)  
Make sure the conditions that follow occur:

 (a)  
On the pilot's overhead panel, P5, the red cargo fire FWD (AFT) warning light is on.

 (b)  
On the main instrument light shield, the red master WARNING lights are on.

 (c)  
The alarm bell is on.

 (d)  
The EICAS message, FIRE CARGO FWD (FIRE CARGO AFT), shows on the EICAS display.

 S 865-194
 (8)  
Remove the smoke source.

 S 735-195

 (9)  
Make sure these conditions occur after the smoke is gone from the area around the orifice:

 (a)  
On the pilot's overhead panel, P5, the red cargo fire FWD (AFT) warning light goes off.

 (b)  
On the main instrument light shield, the red master WARNING lights go off.

 (c)  
The alarm bell is not on.

 (d)  
The EICAS message, FIRE CARGO FWD (FIRE CARGO AFT), does not show on the EICAS display.

 S 915-221
 (10) Do the previous Smoke Test procedure for the AFT fire detection system, use this time the AFT switches.
　
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