26-23-01
 FIRE EXTINGUISHING SYSTEM  ú ú 01 Page 409 ú Nov 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CARGO COMPARTMENT FIRE EXTINGUISHING SYSTEM - CLEANING/PAINTING
_______________________________________________________________
 1.  General_______
 A.  The cargo fire extinguishing system should be cleaned whenever the cargo compartment fire bottle is discharged.
 B.  Only the compartment in which the bottle was discharged requires
 cleaning.

 C.  This procedure has tasks to clean the cargo fire extinguishing system.
 TASK 26-23-01-167-001
 2.  Cargo Fire Extinguishing System Cleaning (Fig. D23366:F701)________________________________________
 A.  Equipment
 (1)  Source - Pressure, Capable of Supplying 35 |5 psig
 B.  Consumables
 (1)  C00913 Compound, Nondrying Resin Mix Corrosion Inhibiting Material -BMS 3-27
 C.  Access
 (1)  
Location Zones 121 Forward Cargo Compartment - Left 122 Forward Cargo Compartment - Right 125 Air Conditioning Distribution Bay - Left 126 Air Conditioning Distribution Bay - Right 141 Aft CaRGO Compartment - Left 142 Aft Cargo Compartment - Right

 (2)  
Access Panels
 821 Forward Cargo Door
 822 Aft Cargo Door

 D.  Prepare for Cleaning
 S 867-002
 (1)  
Open this circuit breaker and install a DO-NOT-CLOSE tag:

 (a)  Circuit Breaker Panel, P18-3
 1) 18-3B1 LWR CARGO FIRE EXT BTL 1

 (2)  
Open the Forward Cargo Door, 821.

 S 017-004

 (3)  
To access the discharge nozzles in the aft cargo bay, open the Aft Cargo Door, 822.

 S 017-005

 (4)  
Remove the lining at the aft end of the forward cargo compartment to get access to the air conditioning distribution bay.

 S 017-003
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-23-01
 ALL  ú ú 01 Page 701 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 017-006
 (5)  
If it is necessary, remove the air conditioning duct that is in front of the fire extinguishing bottle.

 S 037-007

 (6)  
Disconnect the applicable discharge tube from the fire extinguisher bottle discharge head.

 S 037-008

 (7)  
Remove the discharge nozzles from the discharge tubes in the applicable cargo bay.

 (a)  
Remove the four screws (6) securing the retainer (5) to the bracket.

 (b)  
Remove the cargo ceiling as required to gain access to the nut (8).

 (c)  
Remove the two screws (4) securing the discharge nozzle (3) to the pan cover assembly (7).

 (d)  
Remove the discharge nozzle (3).

 E. Procedure
 S 217-009
 (1)  
Make sure the nozzle is clear of unwanted materials.

 S 487-010

 (2)  
Connect a pressure source to the applicable cargo bottle discharge tube.

 (a)  Make sure air is flowing through all the discharge tubes in the cargo compartment.
 S 087-011
 (3)  Remove the pressure source from the discharge tube.
 F. Put the airplane back to its usual condition.
 S 437-012
 (1) Connect the discharge tube to the discharge outlet on the bottle.
 (a)  
Apply a layer of compound, BMS 3-27 to the outlet threads, outlet end, and outlet inner diameter where the tube assembly attaches to the discharge head.

 (b)  
Connect the tube assembly to the discharge head.

 NOTE: Yellow is used to show the plumbing which supplies
____ extinguishant to cargo compartment number 1. Blue is used to show the plumbing which supplies extinguishant to cargo compartment number 2.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-23-01
 ALL  ú ú 01 Page 702 ú Jul 15/98
　
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