(b)  
The squat switch on the main landing gear or the AIR SENSING switch on the E11 panel.

 I. Put the airplane back to its usual condition.
 S 865-078
 (1)  Close these circuit breakers on the P6 panel:
 (a)  
EXTINGUISHER BOTTLES RIGHT

 (b)  
EXTINGUISHER BOTTLES LEFT

 (c)  
EXTINGUISHER BOTTLE RIGHT

 (d)  
EXTINGUISHER BOTTLE LEFT

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (e) (f)  EXTINGUISHER BOTTLES APUOVHT WHL WELL WNG BDY
 (2)  S 415-079Install the APU cowl door.
 (3)  S 865-080Remove electrical power if it is no longer necessary (AMM 24-22-00/201).

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A
737-300/400/500MAINTENANCE MANUAL
 APU FIRE DETECTION SENSING ELEMENT - REMOVAL/INSTALLATION
_________________________________________________________
 1.  General_______
 A.  Three detectors are in the APU compartment; the APU fire detector, the exhaust overheat detector and the exhaust fire detector.
 B.  This section contains two tasks. The first task removes detector elements. It is made up of four procedures. The first procedure prepares for the removal of an element. The second removes an element from the APU fire detector. The third removes an element from the exhaust fire detector. The fourth removes an element from the exhaust overheat detector.
 C.  The second task installs detector elements. It is made up of four procedures. The first procedure prepares for the installation of a detector element. The second installs an element on the APU fire detector. The third installs an element on the exhaust fire detector. The fourth installs an element on the exhaust overheat detector.
 TASK 26-15-14-004-077
 2.  Detector Element Removal (Fig. 401)________________________
 A.  Consumable Materials
 (1)  
Sealant - silicone, Dow Corning DC-4 (AMM 20-30-11/201)

 (2)  
Solvent - cleaning, Isopropyl Alcohol (AMM 20-30-31/201)

 (3)  
Solvent - cleaning, Methyl Alcohol (AMM 20-30-31/201)

 (4)  
Solvent - cleaning, Acetone (AMM 20-30-31/201)

 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

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

 C.  Access
 (1)  
Location Zones

 (a)  
101/102 Control Cabin

 (b)  
703 APU Compartment

 (2)  
Access Panels

 (a)  3804 APU Cowl Door
 D.  Prepare for Detector Element Removal
 S 864-002
 (1)  
Open APU CONT and APU FIRE PROTECTION DETECTION circuit breakers on panel P6.

 S 144-014

 (2)  
Open the APU cowl door and install the rods to support the door.

 (3)  
Hold the APU lower shroud while you open its latches and remove it.

 S 144-015
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
EXHAUST DUCT COOLING AIR INTAKE
FELT METAL LINER
DETECTOR
AFT SEE C FAIRING
APU EXHAUST
MUFFLER  DRIP PANAREA
SEE A APU
SEE B
DETECTOR
APU ENGINE COMPARTMENT DETECTOR (EXAMPLE)
B

APU Fire Detector Installation
　
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