(2)  
Access Panels 311/312 Area Aft of Pressure Bulkhead to BS 1725 (L, R) 313/314 Stabilizer Torsion Box Compartment (L, R) 315/316 APU Compartment

 D.  Prepare for the Test
 S 865-052
 (1)  
Supply electrical power (AMM 24-22-00).

 S 755-053

 (2)  
Make sure these systems operate:

 (a)  
APU fire extinguishing system (AMM 26-22-00).

 (b)  
EICAS (AMM 31-41-00).

 (c)  
Warning System (AMM 31-51-00).

 (d)  
System No. 2 Air/Ground Relay (AMM 32-09-02).

 (e)  
Master Dim and Test System (AMM 33-16-00).

 S 755-054
 (3)  Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:
 (a)  11B24, FIRE DETECTION APU 1
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757 MAINTENANCE MANUAL
 (b)  
11B25, FIRE DETECTION APU 2

 (c)  
11B33, APU REMOTE FIRE IND

 S 865-055
 (4)  Open this circuit breaker on the P11 panel and attach a DO-NOT-CLOSE tag:
 (a)  11J25, FIRE DET ALTN PWR APU
 S 865-056
 WARNING:  FAILURE TO OPEN THE CIRCUIT BREAKER ON THE P6 PANEL WILL CAUSE THE CONTENTS OF THE APU FIRE BOTTLE TO BE RELEASED. THIS CAN CAUSE INJURY TO PERSONS.
 (5)  Open this circuit breakers on the P6 panel and attach a DO-NOT-CLOSE tag:
 (a)  6G1, FIRE EXT APU
 E. Do a Test of the APU Fire Detection System
 S 715-057
 (1)  Do the operational test.
 F. Do a Test of the APU Detector Elements
 S 015-058
 (1)  
Open the APU access doors and install the rods to hold the doors open.

 S 865-059

 (2)  
Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:

 (a)  
11B24, FIRE DETECTION APU 1

 (b)  
11B25, FIRE DETECTION APU 2

 S 035-060
 (3)  
Disconnect the electrical connectors, D1908 and D1914 (loop 1 and 2 lower detector elements), which are installed on the APU access door.

 (4)  
Connect the test box to the electrical connector, D1908.

 S 865-062

 (5)  
Remove the DO-NOT-CLOSE tags and close these panel circuit breakers on the P11 panel:

 (a)  
11B24, FIRE DETECTION APU 1

 (b)  
11B25, FIRE DETECTION APU 2

 S 435-061
 S 865-063
 (6)  Put the FIRE switch on the test box to the ON position and make sure these indications occur:
 (a) The red APU light on the APU fire switch (on P8) comes on.
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757 MAINTENANCE MANUAL
 (b)  
The red FIRE light, on P1-3, comes on.

 (c)  
The EICAS message, APU FIRE, shows on the top display.

 (d)  
The red master WARNING lights, on P7, come on.

 (e)  
The fire bell is heard.

 (f)  
The red APU FIRE light, on P62, comes on.

 S 865-064
 (7)  
Release the FIRE switch on the test box and make sure the
 indications stop.

 S 735-065

 (8)  
Do the Test again for the Fire Detector Element.

 S 425-090

 (9)  
Connect the test box to the electrical connector, D1914.

 S 865-066

 (10)
 Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:

 (a)  
11B24, FIRE DETECTION APU 1
　
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