(d)  
Release PRESS TO TEST switch. 1) Ensure all smoke detector indicators (loop A and B) on CEU go out.

(4)  
Put cover over CEU.

(5)  
Install screws to hold cover in place.

F.  Return Airplane to its Normal Condition
(1)  
Close the applicable (FWD/4404R or AFT/4504R) Cargo Compartment Door.

(2)  
Remove electrical power if no longer required (AMM 24-22-0/201).

550 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-20-12 Page 405 

CARGO FIRE CONTROL PANEL - REMOVAL/INSALLATION
EFFECTIVITY
737-200 Passenger Airplanes Incorporating SB 26A1081
1.  General
A.  This procedure has these tasks:
(1)  
Removal of the Cargo Fire Control Panel (P8).

(2)  
Installation of Cargo Fire Control Panel (P8).

B.  The Cargo Fire Control Panel is installed on the P8 panel.
2.  Cargo Fire Control Panel Removal (Fig. 401)
A.  Access
(1)  Location Zones
(a)  
121 Control Cabin - Left

(b)  
122 Control Cabin - Right

B.  Cargo Fire Control Panel Removal
(1)  
Open these circuit breakers and install DO-NOT-CLOSE tags:

(a)  Circuit breaker panel P6 or P18:
1) CARGO FIRE FWD DET A
2) CARGO FIRE FWD DET B
3) CARGO FIRE AFT DET A
4) CARGO FIRE AFT DET B
5) CARGO FIRE EXT 1

(2)  
Loosen the four quarter-turn fasteners securing the cargo fire control panel (P8), to the frame.

(3)  
Slide cargo fire control panel out of the frame.

(4)  
Disconnect electrical connector from cargo fire control panel (P8).

3.  Cargo Fire Control Panel Installation (Fig. 401)
A.  References
(1)  
Cargo Smoke Detection - Operational Test (AMM 26-20-0/501).

(2)  
Fire Extinguishing Bottle Pressure Switch Test (AMM 26-25-01/401).

(3)  
Squib Circuit Test (AMM 26-25-01/401).

B.  Access
(1)  Location Zones
(a)  
121 Control Cabin - Left

(b)  
122 Control Cabin - Right

C.  Cargo Fire Control Panel Installation
(1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

(a)  Circuit breaker panel P6 or P18:
1) CARGO FIRE FWD DET A
2) CARGO FIRE FWD DET B
3) CARGO FIRE AFT DET A
4) CARGO FIRE AFT DET B
5) CARGO FIRE EXT 1

(2)  
Connect electrical connector to cargo fire control panel (P8).

(3)  
Slide cargo fire control panel (P8), into frame and secure with quarter-turn fasteners.

May 01/99 26-20-13 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

K13401
Cargo Fire Control Panel Installation  550 
26-20-13  Figure 401  May 01/99 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(4)  Tighten the quarter-turn fasteners to hold the cargo fire control panel (P8), in place.
D.  Cargo Fire Control Panel (P8), Installation Test
(1)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

(a)  Circuit breaker panel P6 or P18:
1) CARGO FIRE FWD DET A
2) CARGO FIRE FWD DET B
3) CARGO FIRE AFT DET A
4) CARGO FIRE AFT DET B
5) CARGO FIRE EXT 1

(2)
Perform the Cargo Smoke Detection-Operational Test (AMM 26-20-0/501).

(3)  
Perform the Fire Extinguishing Bottle Pressure Switch Test (AMM 26-25-01/401).

(4)  
Perform the Squib Circuit Test (AMM 26-25-01/401).

550 
May 01/99  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  26-20-13 Page 403 

ENGINE FIRE EXTINGUISHING SYSTEM - DESCRIPTION AND OPERATION
1. General
A.  The engine fire extinguishing system is a fixed system providing fire extinguishing capability to each engine. The extinguishing system is a gaseous smothering system designed to flood either engine cowling area with an inert gas in case of fire. The fire extinguishing system is electrically controlled by a fire switch for each engine.

B.  The engine fire extinguishing system consists of the fire protection system module, fire extinguisher bottles and bottle fittings, selector control valves and associated tubing (Fig. 1). The fire extinguisher bottle fittings and selector valves are connected by airplane wiring to the engine fire switches and bottle discharge lights on the fire protection system module. The fire protection system module contains the fire switches, discharge lights, test lights and circuitry necessary to isolate the affected engine and discharge the extinguishing agent of either fire extinguisher bottle into the affected engine cowling.
　
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