(b)
The squib test will not work if the FWD ARM switch or the AFT ARM switch is in the ARMED position.
C. Manual Control
(1)
Supply Electrical Power (AMM 24-22-0/201).
(2)
Close the CARGO FIRE EXT 1 circuit breaker on the P6 or P18 panel.
(3)
If the FWD ARM light (Red) illuminates on the cargo fire control panel, depress the FWD ARM switch and then the DISCH switch.
(4)
If the AFT ARM light (Red) illuminates on the cargo fire control panel, depress the AFT ARM switch and then the DISCH switch.
500
26-25-0 Page 6 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/01
CARGO COMPARTMENT FIRE EXTINGUISHING SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
737-200 Passenger Airplanes Incorporating SB 26A1081
1. General
A. This procedure has the following tasks:
(1)
Test of the cargo compartment fire bottle squib(s) circuitry.
(2)
Test of the cargo compartment fire bottle low pressure switch circuitry.
(3)
Airflow test through the cargo compartment fire discharge tubing and nozzles.
(4)
Pressure test of the cargo compartment fire bottle discharge tubing.
2. Squib Circuit Test (Fig. 501)
A. General
(1) The squib circuit test should be performed every time the cargo fire control panel or the fire bottle squibs are disconnected from the airplane wiring.
B. References
(1)
Manual Control - Maintenance Practices (Apply Power) (AMM 24-22-0/201).
(2)
Electrostatic Sensitive Devices - Maintenance Practices (AMM 20-40-12/201).
C. Equipment
(1) Multimeter (Commercially available)
D. Access
(1)
Location Zones
(a)
213 Forward Cargo Compartment
(b)
214 Mix Manifold Bay
(c)
121 Control Cabin - Left
(d)
122 Control Cabin - Right
(2)
Access Panels
(a) 4404R, Forward Cargo Door
E. Prepare for the Test
(1)
Supply Electrical Power, Manual Control - Maintenance Practices (Apply Power) (AMM 24-22-0/201).
(2)
Open this circuit breaker and install DO-NOT-CLOSE tag:
(a) Circuit breaker panel P6 or P18:
1) CARGO FIRE EXT 1
(3)
Open 4404R, Forward Cargo Door.
(4)
Remove lining at the aft end of the forward cargo compartment to gain access to the cargo fire bottle (AMM 25-52-131/401).
(5)
If needed, remove the air conditioning duct in front of the cargo fire bottle (AMM 21-21-11/401).
May 01/99 26-25-0 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
F. Squib Circuit Test
WARNING: REFER TO AMM 20-40-12 BEFORE PROCEEDING WITH THE FOLLOWING STEPS. ELECTROSTATIC DISCHARGE CAN CAUSE THE FIRE BOTTLE SQUIB TO FIRE AND RELEASE THE BOTTLE CONTENTS SUDDENLY, CAUSING INJURY TO PERSONNEL.
(1)
Prior to touching either squib, perform procedure for devices that are sensitive to electrostatic discharge (AMM 20-40-12/201).
(2)
Disconnect the electrical connectors from the squibs on the cargo fire bottle.
(a)
Disconnect D12794 connector from FWD squib M2249.
(b)
Disconnect D12796 connector from AFT squib M2250.
WARNING: INSTALL PROTECTIVE COVERS ON THE SQUIBS. IF YOU DO NOT PUT PROTECTIVE COVERS ON THE SQUIBS, THE FIRE BOTTLE CAN DISPENSE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONNEL.
CAUTION: DO NOT PUT A SHUNT PLUG ON THE FIRE BOTTLE SQUIB. THE SHUNT PLUG CAN CAUSE DAMAGE TO THE SQUIB CONNECTOR PINS.
(3)
Install a protective cover on each squib.
(4)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) Circuit breaker panel P6 or P18:
1) CARGO FIRE EXT 1
(5)
Perform a test of the cargo fire bottle forward squib circuit.
(a)
Use a multimeter to accomplish a check for less than 1 volt dc between pins 1 and 3 on connector D12794.
(b)
Depress the FWD ARM switch on the cargo fire control panel (P8), to the ARMED position. 1) The ARMED light (White) will illuminate.
(c)
Depress and hold the DISCH switch on the cargo fire control panel (P8).
(d)
Perform a check for more than 16 volt dc between pins 1 and 3 on connector D12794.
(e)
Release the DISCH switch on the cargo fire control panel (P8).
1) Voltage at connector D12794 will read 0 volt dc.
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