(c)
All of the lights in the APU fire switch

(34)
Make sure the two FIRE WARN lights on the P7 panel go off.

(35)
Make sure the alarm bell in the control cabin makes no sound.

(36)
Hold the TEST switch on the P8-1 panel to the OVHT position.

(37)
Make sure only the APU DET INOP light comes on.

(38)
Release the TEST switch on the P8-1 panel.

(39)
Move the two OVHT DET switches on the P8-1 panel to the NORM position.

(40)
Remove electrical power if it is no longer necessary (Ref 24-22-0 MP).

5C8 
26-11-0 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

3.  Do the System Test of the Engine Fire Detection System
A.  Standard Tools and Equipment
(1)  Multimeter - 0-1 megohm serviceable range
B.  Prepare to do the System Test
(1)  
Supply electrical power (Ref 24-22-0 MP).

(2)  
Make sure these circuit breakers are closed:

(a)  P6 Load Control Center - Right
1) MASTER WARN & CONTROL
2) MASTER CAUTION BAT (two)
3) INDICATOR LIGHTS MASTER DIM (nine)
4) DIM AND TEST CONTROL

(3)  
Open these circuit breakers:

(a)  P6 Load Control Center - Right 1) C405 FIRE PROT DET ENG-1 2) C407 FIRE PROT DET ENG-2 3) APU FIRE DET 4) EXTINGUISHER BOTTLES RIGHT 5) EXTINGUISHER BOTTLES LEFT 6) EXTINGUISHER BOTTLE RIGHT (if installed) 7) EXTINGUISHER BOTTLE LEFT (if installed) 8) EXTINGUISHER BOTTLES APU 9) WHEEL WELL WING AND LWR BODY OVHT 10) CARGO SMOKE (Passenger/Cargo Convertible Airplanes)

(4)  
Push the left MASTER CAUTION light, or the right MASTER CAUTION light on the P7 panel.

(5)  
Make sure the two MASTER CAUTION lights and the OVHT/DET annunciator are off.

(6)  
Move the two OVHT DET switches on the P8-1 panel to the NORM position.

(7)  
Open the fan cowl panels (Ref 71-11-11).

C.  Test the Fire Detection Elements
(1)  Make sure (by a visual check) that the fire detection elements on the two engines are the same type as the detection system in the airplane.
CAUTION:  MAKE SURE THE DETECTION ELEMENTS ARE OF THE SAME TYPE AS THE DETECTION SYSTEM IN THE AIRPLANE. THE ENGINE FIRE DETECTION SYSTEM WILL NOT OPERATE IF AN INCORRECT FIRE DETECTOR IS INSTALLED.
NOTE: Identification is found at one end of each detector.
(2)  
Make marks on each detector/connector pair. Use a unique marking (colored tape or equivalent) to prevent cross-connection.

CAUTION:  MARK EACH DETECTOR AND ELECTRICAL CONNECTOR PAIR. IF WIRES ARE CROSS-CONNECTED, FALSE INDICATIONS WILL OCCUR.

(3)  
Remove the electrical connectors from the two ends of each detector.

(4)  
Install caps on the electrical connectors to prevent contamination.

NOTE:  Install the caps when you will not use the connectors for a time. Remove the caps when you do a test or clean the connectors.

(5)  
Make a continuity check of each detection element.

(a)  
Make a check for continuity between the contact at the center of one end to the contact at the center of the opposite end. 1) Engine sensing element 2) Firewall sensing element

(b)  
Make sure that the detector and airplane electrical connectors are clean.

5C6 
Oct 20/90  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-11-0 Page 503 

1)  Clean the connector when contamination is found (Ref Standard Wiring Practices Manual 20-91-00).
CAUTION:  CLEAN THE CONNECTORS WITH METHYL ALCOHOL OR ACETONE ONLY. IF YOU USE A SOLVENT THAT CONTAINS CHLORIDES, IT CAN CAUSE CORROSION IN THE SEALED AREAS.
(c)  
Shake out all liquid from the detector and airplane electrical connectors.

(d)  
Dry the detector and airplane electrical connectors with dry compressed air or nitrogen at a pressure of 20-25 psig.

NOTE:  A part that is moist can cause low resistance to ground in the subsequent system test.

(e)  
Apply a very light coat of some DC-4 silicone grease to the copper sealing gasket on the plug connector.

NOTE:  Do not let the grease touch the connector pins, contacts or fill the empty space.

(f)  
Carefully engage the contact pins into the receptacles.

NOTE:  The pin plug (male connector) connects to the socket receptacle (female connector). The socket plug (female connector) connects to the pin receptacle (male connector).

(g)  
Tighten the electrical connectors to 50-70 pound-inches.

(h)  
　
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