5C8 
Feb 20/90  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-11-11 Page 401 

H27691 H27667
Engine - Firewall Fire Detection Sensing Element Installation  550 
26-11-11  Figure 401 (Sheet 1)  Feb 20/87 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

513  Engine - Firewall Fire Detection Sensing Element Installation 
Feb 20/87  Figure 401 (Sheet 2)  26-11-11 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  Install Sensing Element (Fig. 401, 402)
CAUTION:  IF NEW ELEMENT IS BEING INSTALLED, CHECK THAT PART NUMBER IS IDENTICAL TO THE ELEMENT REMOVED.
(1)  
Remove protective caps from each element fitting and jamnuts from aft element fittings.

(2)  
Support element to prevent bending and install aft fittings on mounting bracket. Install bonding jumpers per 20-10-185. Install jamnuts and lockwire together.

(3)  
Install element in clamps.

(4)  
Install forward element fitting on bracket with mounting screw.

NOTE: Loosen clamps and adjust element fit as necessary; tighten clamps.

(5)  
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 connector.

CAUTION:  CLEAN CONNECTORS USING ISOPROPYL OR, 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.

(6)  
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.

(7)  
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. Apply light coat of DC-4 grease on copper sealing gasket (Fig. 402).

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

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

NOTE:  Female electrical connectors (socket receptacle end) are connected to the low temperature element. Male electrical connectors (pin receptacle end) are connected to the high temperature element (Fig. 402).

(9)  
Check electrical bond between electrical connector and engine per 20-22-01. Resistance should not exceed 0.0025 ohms.

5C8 
26-11-11 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Apr 01/97 

H27697
551  Fire Detector Electrical Connectors 
Feb 20/88  Figure 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-11-11 Page 405 

C.  Perform Operation Test
(1)  Operation Test - (Airplanes with Single Squib Bottles)
(a)  
Provide electrical power (Ref 24-22-0 MP).

(b)  
Ensure C405 FIRE PROT DET ENG-1 and C407 FIRE PROT DET ENG-2 circuit breakers are closed.

(c)  
Press either master caution light on captain's and first officer's lightshield and verify that both master caution and master annunciator lights are off.

(d)  
Ensure overheat detector switches on fire protection panel are in NORM position.

(e)  
At the Engine and APU Fire Control Panel P8-1, hold the overheat-fire test switch to the fire position and verify the following indications are present: 1) Both red fire warning lights on P7 panel are illuminated. 2) Eng-1 and Eng-2 fire switch handles are illuminated. 3) The fire bell in control cabin sounds.

(f)  
Hold the overheat-fire test switch to the overheat position and verify the following indications are present: 1) Eng-1 and Eng-2 overheat lights on fire protection module are illuminated. 2) Both master caution lights and overheat detector annunciator light on panel P7

are illuminated.
(2)  Operation Test - (Airplanes with Dual Squib Bottles)
(a)  
Provide electrical power (Ref 24-22-0 MP).

(b)  
Ensure C405 FIRE PROT DET ENG-1 and C407 FIRE PROT DET ENG-2 circuit breakers are closed.

(c)  
Press either MASTER CAUTION light on lightshield P7 and verify both MASTER CAUTION and OVHT/DET annunciator lights are off.
　
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