S 865-028
 (a)  P6, Main Power Distribution Panel 1) 6C5, ALTN PWR APU FIRE/BLD DUCT OVHT LOOP A
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 2) 6H14, APU FIRE/BLD DUCT OVHT LOOP A 3) 6H15, APU FIRE/BLD DUCT OVHT LOOP B 4) 6H16, APU FIRE WARN HORN
 (b)  P7, Overhead Circuit Breaker Panel
 1) 7F09, EIU L
 2) 7F10, EIU C
 3) 7F15, EIU R

 E. Airplane Wiring Continuity Test
 S 015-203
 (1)  
Open the latches on the APU access doors.

 S 015-158

 (2)  
Open the APU access doors.

 S 865-204

 (3)  
Engage the support rods for the APU access doors.

 S 865-079

 (4)  
Push the FIRE/OVHT TEST switch for ten seconds on the miscellaneous switching module M7317 (P5).

 S 035-037

 (5)  
Disconnect the connector M216A (pin plug) from the APU fire detector M216 at the left APU access door.

 S 485-085

 (6)  
Connect a 300 ohms resistor from the center pin DM216A loop A (airplane wiring) to the connector shell of the disconnected detector element. Keep the resistor in place.

 S 485-086

 (7)  
Connect a jumper wire from the center pin DM216A loop A (airplane wiring) to the connector shell of the disconnected detector element.

 (a) Make sure the EICAS (warning) message, FIRE APU, comes on.
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 (8)  S 085-088Remove the jumper wire and the resistor. (a) Make sure the EICAS (warning) message, FIRE APU, does not show. (b) Make sure the EICAS (status) message, APU FIRE LOOP A, does not show.
 (9)  S 025-216Disconnect the connector M216B (pin plug) from the APU fire detector M216 at the left APU access door.
 S 425-217

 (10)
 Connect a 300 ohms resistor from the center pin DM216B loop A (airplane wiring) to the connector shell of the disconnected detector element. Keep the resistor in place.

 S 425-218

 (11)
 Connect a jumper wire from the center pin DM216B loop A (airplane wiring) to the connector shell of the disconnected detector element.

 (a)  Make sure the EICAS (warning) message, FIRE APU, comes on.
 S 025-219
 (12) Remove the jumper wire and the resistor.
 (a)  
Make sure the EICAS (warning) message, FIRE APU, does not show.

 (b)  
Make sure the EICAS (status) message, APU FIRE LOOP B, does not show.

 S 865-244
 (13) Open these circuit breakers:
 (a)  
6C5, ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT

 (b)  
6H14, APU FIRE/BLD DUCT OVHT LOOP A

 S 865-245
 (14)
 Make sure the EICAS (status) message "APU FIRE LOOP A" comes on.

 S 865-246

 (15)
 Close this ciruit breaker:

 (a)  6C5, ALTN PWR LOOP A APU/FIRE/BLD DUCT OVHT
 S 865-247
 (16)
 Make sure the EICAS (status) message "APU FIRE LOOP A" does not show.

 S 865-248

 (17)
 Open this circuit breaker:

 (a)  6C5, ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT

 (18)
 Make sure the EICAS (status) message "APU FIRE LOOP A" comes on.

 S 865-249
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747-400 MAINTENANCE MANUAL
　
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