(2)
Discharge port cap (Fwd Port = 1/2”, Aft Port = 5/8”)
B. Reference
(1) Electrostatic Discharge Sensitive Devices - Maintenance Practices (AMM 20-40-12/201).
C. Access
(1)
Location Zones
(a) 214 Air Conditioning Distribution Bay
(2)
Access Panels
(a) 4404R, Forward Cargo Door
D. Prepare for removal
(1)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) Circuit Breaker Panel P6 or P18:
1) CARGO FIRE EXT 1
(2)
Open 4404R, Forward Cargo Door.
(3)
Remove lining at the aft end of forward cargo compartment to gain access to the mix manifold bay (AMM 25-52-131/401).
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.
(4)
Prior to touching squibs, perform procedure for devices that are sensitive to electrostatic discharge (AMM 20-40-12/201).
E. Remove Squib
(1)
The procedure is the same for the removal of the FWD or AFT squib.
(2)
Disconnect the electrical connector from selected squib.
(a)
FWD Squib (M2249) connector D12794.
(b)
AFT Squib (M2250) connector D12796.
May 01/99 26-25-02 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
K13409
Cargo Compartment Fire Extinguisher Bottle Squib Installation 550
26-25-02 Figure 401 May 01/01
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
WARNING: INSTALL PROTECTIVE COVERS ON THE SQUIBS. IF YOU DO NOT PUT PROTECTIVE COVERS ON THE SQUIBS, THE FIRE EXTINGUISHING 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 protective cover on the cargo fire bottle squib.
(4)
Remove lockwire from the squib.
(5)
Remove squib from the discharge head.
3. Install the Cargo Fire Extinguisher Bottle Squib (Fig. 401)
A. Equipment
(1) Voltmeter with a 10K ohm or greater resistance.
B. Reference
(1)
Electrostatic Discharge Sensitive Devices - Maintenance Practices (AMM 20-40-12/201).
(2)
Manual Control -Maintenance Practices (Apply Power) (AMM 24-22-0/201).
C. Access
(1)
Location Zones
(a) 214 Mix Manifold Distribution Bay (AMM 25-52-131/401).
(2)
Access Panels
(a) 4404R, Forward Cargo Door
D. Prepare for installation
(1)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) Circuit Breaker Panel P6 or P18:
1) CARGO FIRE EXT 1
(2)
Open 4404R, Forward Cargo Door.
(3)
Remove lining at aft end of forward cargo compartment to gain access to the mix manifold bay (AMM 25-52-131/401).
(4)
If necessary, remove the air conditioning duct that is in front of the fire-extinguishing bottle (AMM 21-21-11/401).
E. Install Squib
(1)
The procedure is the same for installation of either the FWD or AFT squib.
(2)
Accomplish these steps to install the squib.
WARNING: REFER TO AMM 20-40-12/201, 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.
(a)
Prior to touching squibs, perform procedure for devices that are sensitive to electrostatic discharge (AMM 20-40-12/201).
(b)
Install squib in the discharge head.
(c)
Torque squib to 90-100 pound-inches.
(d)
Install lockwire on the squib.
(e)
Remove protective cover from the squib.
WARNING: ENSURE THERE IS NO VOLTAGE AT THE ELECTRICAL CONNECTOR. IF THERE IS VOLTAGE AT THE ELECTRICAL CONNECTOR, THE SQUIB CAN RELEASE THE BOTTLE CONTENTS SUDDENLY, CAUSING INJURY TO PERSONNEL.
(f)
Ensure there is no voltage between pins 1 and 2 of electrical connector.
NOTE: Connect a 10K-ohm resistor across the meter leads to remove all stray voltage from the electrical connect.
(g)
Ensure squib pins are not bent or damaged.
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