(e)  
Replace the jamnuts on the element fittings.

 (f)  
Install protective caps on the element fittings.

 TASK 26-15-14-404-075
 3. Detector Element Installation (Fig. 401)
_____________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 26-15-00/501, APU Fire Detection

 B. Access
 (1)  
Location Zones
 101/102 Control Cabin
 703 APU Compartment

 (2)  
Access Panels
 3804 APU Cowl Door

 C. Install an APU Fire Detector Element (Fig. 401)
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 737-300/400/500MAINTENANCE MANUAL
 S 214-078
 CAUTION: MAKE SURE THE PART NUMBER OF THE NEW DETECTOR IS IDENTICAL TO
_______ THE PART NUMBER OF THE UNIT REMOVED. INSTALLATION OF THE WRONG PART CAN CAUSE THE DETECTION SYSTEM TO FAIL.
 (1)  
Remove the protective caps and the jamnuts from element fittings.

 S 434-079

 (2)  
Insert the element fittings into the bracket then clamp the sensing element into position.

 S 434-080

 (3)  
Install the jamnuts.

 S 014-089

 (4)  
AIRPLANES WITH SL 26-28; Do the steps that follow:

 (a)  
Install the silicone tubing with the slit facing away from the detector bend.

 (b)  
Install the lacing tape.

 S 034-043
 (5)  
Remove the protective caps from the electrical connectors.

 S 184-044

 (6)  
Make sure the connectors are clean and dry.

 S 114-081
 CAUTION: ONLY USE ISOPROPYL OR METHYL ALCOHOL OR ACETONE TO CLEAN
_______ CONNECTORS. DO NOT USE OTHER CLEANING SOLVENTS. COMMERCIALLY AVAILABLE CONTACT CLEANERS MAY CONTAIN CHLORIDES WHICH PROMOTE CORROSION IN SEALED AREAS, AND SHOULD NOT BE USED.
 (7)  
Make sure the detector and electrical connectors are clean. Clean per wiring diagram manual (AMM 20-30-31/201) if contamination is found.

 S 644-083

 (8)  
Apply a very light coat of DC-4 silicone grease to the copper sealing gasket on the plug connector.

 NOTE: Do not get grease in the connector, on the connector pins or
____
 the contacts.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 434-046
 (9)  
Carefully connect the electrical connectors.

 S 434-047

 (10)
 Tighten the electrical connectors to a torque of 50-70 pound-inches.

 S 764-048

 (11)
 Measure the resistance between electrical connector and APU.

 S 764-049

 (12)
 Make sure the resistance is less than 0.0025 ohm.

 S 434-084

 (13)
 Lockwire the element end fittings, jamnuts and electrical connectors together.

 S 734-050

 (14)
 Do the APU fire detection system test (AMM 26-15-00/501).

 D. Install an Exhaust Fire Detector Element (Fig. 401)
 S 424-076
 CAUTION: VERIFY THAT THE PART NUMBER OF THE NEW UNIT IS IDENTICAL TO THE
_______ PART NUMBER OF THE UNIT REMOVED. INSTALLATION OF THE WRONG PART CAN CAUSE THE DETECTION SYSTEM TO FAIL.
 (1)  Install the fire sensing element as follows:
 (a)  
Remove the protective caps and jamnuts from the element fittings.

 (b)  
Insert the element fittings into the bracket on the forward muffler cone, then clamp sensing element into position.

 (c)  
Install the jamnuts.

 S 434-085
 (2)  
Install the exhaust overheat detector element as follows:

 (a)  
　
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