E. Prepare for Installation
(1)
Supply Electrical Power Manual Control - Maintenance Practices (Apply Power)
(AMM 24-22-0/201).
(2)
Open this circuit breaker and attach a 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 aft end of forward cargo compartment to gain access to mix manifold bay (AMM 25-52-131/401).
(5)
If necessary, remove air conditioning duct in front of fire extinguishing bottle
(AMM 21-21-11/401).
WARNING: REFER TO AMM 20-10-12 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.
(6)
Before touching squib, do the procedure for devices sensitive to electrostatic discharge (AMM 20-40-12/201).
F. Install Bottle
WARNING: DO NOT MOVE BOTTLE WITHOUT A CAP ON PORTS. DO NOT LET BOTTLE HIT THE AIRPLANE. BE CAREFUL NOT TO CAUSE DAMAGE TO BOTTLE. DAMAGE TO BOTTLE CAN CAUSE IT TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Before installing bottle, make sure its weight is not more than 0.1 pounds from weight marked on I.D. plate of bottle.
NOTE: The measured weight of bottle includes; charged bottle, discharge outlets, ground lug and squibs. If the squibs are not installed on bottle, do not install them. Weigh the squibs as loose parts. Include weight of squibs in the measured weight but do not install them. If squibs are installed, weigh bottle with squibs. Remove protective caps when weighing parts.
(2)
Lift bottle using service handles and set it on support brackets.
(3)
Install bolts and washers to hold bottle in position.
(4)
If discharge ports are not aligned with discharge tubes, perform this step:
(a)
Remove lockwire from gland nuts.
(b)
Loosen discharge head gland nuts.
(c)
Adjust discharge heads to give best possible access to tube connections.
(5)
Remove caps from discharge port and discharge tube.
(6)
Connect FWD (yellow) and AFT (blue) discharge tubes to discharge ports.
(a)
Apply a layer of compound, BMS 3-27 to threads where tube attaches to discharge port.
(b)
Connect the discharge tubes to the discharge ports.
(c)
Refer to outlet identification above each discharge outlet to ensure tubes are connected to correct ports.
(d)
Remove all unwanted compound, BMS 3-27.
(7)
If discharge head was adjusted, perform these steps:
(a)
Tighten gland nuts to 540-660 pound-inches.
(b)
Attach a lockwire from one gland nut to the other gland nut.
(8)
Tighten the discharge tubes to 266-294 pound-inches for the FWD (1/2 inch) connector and 342-378 pound-inches for the AFT (5/8 inch) connector.
(9)
Install the nuts to connect the ground straps to the ground lugs.
(10)
Use an ohmmeter to check resistance between fire extinguishing bottle and mounting pan.
(a)
Ensure resistance is less than 0.0025 ohms.
(b)
If resistance is greater than 0.0025 ohms, clean the faying surfaces with solvent TT-N-95.
(c)
Do the resistance check again.
500
26-25-01 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
WARNING: REFER TO AMM 20-10-12 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.
(11)
If discharge cartridge (squib) is not installed on fire extinguisher bottle, perform the steps that follow:
(a) Install squib in discharge head (AMM 26-25-02/401).
(12)
Connect and perform a test of the electrical connector to bottle pressure switch, D12792.
(a)
Connect electrical connector to bottle pressure switch, D12792.
(b)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
1) Circuit Breaker Panel P6 or P18:
a) CARGO FIRE EXT 1
(c)
Push and hold pressure switch self test button on fire extinguishing bottle.
(d)
Ensure the DISCH light (Amber) on the cargo fire control panel (P8) illuminates.
(e)
Release pressure switch self test button on fire extinguishing bottle.
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