CAUTION:  CONNECTOR MUST BE THOROUGHLY DRY OR CORROSION MAY RESULT.

(7)  
On configuration II electrical connector, apply very light coat of DC-4 grease to copper gasket. On configuration I electrical connector, discard old copper gasket and replace with new copper gasket (Fig. 402).

NOTE: Avoid getting grease in connector cavity or on connector pins or contacts.

(8)  
Carefully engage contact pins into receptacles and tighten electrical connectors to a torque of 50-70 pound-inches.

(9)  
Lockwire element end fittings, jamnuts and electrical connectors together.

(10)
Tape loose end of sensing element cable to heat shield and muffler assembly.

506 
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C.  Carefully install aft fairing heat shield and muffler assembly through opening in tail cone (Ref 49-81-31 R/I). Install two screws in aft fairing.
CAUTION:  EXHAUST SENSING ELEMENTS MAY BE DAMAGED DURING INSTALLATION OF HEAT SHIELD AND MUFFLER ASSEMBLY THROUGH TAIL CONE.
D.  Remove protective caps from electrical connectors and verify detector and airplane electrical connectors are dry, clean and free of contaminates. If contamination is found, clean connectors.
CAUTION:  CLEAN CONNECTORS USING METHYL ALCOHOL OR ACETONE ONLY. DO NOT USE OTHER CLEANING SOLVENTS FOR THIS PURPOSE. COMMERCIALLY AVAILABLE CONTACT CLEANERS MAY CONTAIN CHLORIDES WHICH PROMOTE CORROSION IN SEALED AREAS, AND SHOULD NOT BE USED.
506 
Feb 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-15-12 Page 407 

E.  Shake out excess liquid and dry with either dry compressed air or nitrogen at a pressure of 20-25 psig.
CAUTION: CONNECTOR MUST BE THOROUGHLY DRY OR CORROSION MAY RESULT.
F.  On configuration II electrical connector, apply very light coat of DC-4 grease to copper sealing gasket. On configuration I electrical connector, discard old gasket and replace with new copper gasket (Fig. 402).
NOTE: Avoid getting grease in connector cavity or on connector pins or contacts.
G.  Carefully engage contact pins into receptacles and tighten electrical connectors to a torque of 50-70 pound-inches.
H.  Connect cable leading to exhaust overheat sensing element. Clamp cable in place.
I.  Test APU sensing elements (Ref APU Fire Detection System A/T).
J.  Install drip pan.
K.  Install remaining screws in aft fairing.
L. Lockwire exhaust fire sensing element end fittings, jamnuts and electrical connector together. Return Airplane to Normal Configuration
A.  Support APU lower shroud and install shroud.
B.  Remove door support rods and close APU access door.
C.  Close APU CONT and APU fire detection circuit breakers on load control center P6.
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H21682 K19128
506  Fire Detector Electrical Connectors 
Feb 20/88  Figure 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-15-12 Page 409 

M276 Silicone Tube Installation  5E2 
26-15-12Page 410   Figure 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

MAIN CABIN SMOKE DETECTION SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
Passenger/Cargo Convertible Airplanes
1. General
A.  The smoke detection system monitors main cabin air and electronic equipment compartment air for the presence of smoke, or equivalent contaminant, and provides visual and aural warning if smoke is detected. The fire bell sounds, cargo warning lights and master fire warning lights illuminate if smoke is detected or if the system is tested.
B.  Smoke detectors are connected in series between tubing, which is vented into the main cabin and electronic equipment compartment and tubing connected to the equipment cooling blower intake duct. The smoke detectors are electrically connected to control amplifiers, which control the warning devices. When the airplane is pressurized or the equipment-cooling blower is on, differential pressure forces air from the main cabin and electronic equipment compartment through the tubing and smoke detectors and out the equipment cooling blower and air conditioning exhaust. The smoke detector system is split into two separate sections with each section capable of controlling the alarm devices. The forward section consists of A and B smoke detectors, four sensing ports and a control amplifier. The aft section also consists of A and B smoke detectors, four sensing ports and a control amplifier. The forward section monitors the electronic equipment compartment and the area forward of station 650 (approximately) in the main cabin area. The aft section monitors the remaining portion of the main cabin. The four smoke detectors, two control amplifiers and two test relays are located in the forward cargo compartment adjacent to the oxygen bottles. See Fig. 1 and 2 for location and connection of components and sensing ports. The sensing ports in the main cabin are installed behind the dado panels and return air grilles. (Refer to Passenger Cabin Lining and Insulation, Chapter 25.) The electronic equipment compartment sensing port is installed just below the main cabin floor near the center of the compartment.
　
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