(2)
Cable Assembly F80229-57 or -60
(3)
Multimeter - 0-1000v dc |1%, 0-750v ac, 0-2 amps, 0-2 megohm (commercially available)
(4)
Resistor - 10 Kohms or greater
B. References
(1)
AMM 20-40-12/201, Electrostatic Discharge Sensitive Devices
(2)
AMM 24-22-00/201, Manual Control
C. Access
(1)
Location Zone
(a)
703 APU Compartment
(b)
101, 102 Control Cabin
(2)
Access Panels
(a) 3701 Stabilizer Trim Access Door
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(b) 3804 APU Cowl Door
D. Prepare for the Test
S 865-010
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-011
(2)
Open the 3804 APU Cowl Door and the 3701 Stabilizer Trim Access Door.
S 755-012
(3)
Open the circuit breakers for the EXTINGUISHER BOTTLES APU on the P6-2 panel and attach DO-NOT-CLOSE tags.
S 865-076
WARNING:_______ DO NOT TOUCH THE SQUIB BEFORE YOU DO THE PROCEDURES FOR DEVICES
THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC
DISCHARGE CAN CAUSE THE FIRE BOTTLE TO RELEASE ITS CONTENTS
SUDDENLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(4)
Before you touch the squib, do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-40-12/201).
S 865-013
(5)
Remove the D594 connector on the APU bottle squib. S 865-085
(6)
Put protective cover on the fire bottle squibs.
S 865-063 WARNING: DO NOT INSTALL THE D594 CONNECTOR ON THE APU BOTTLE SQUIB
_______ DURING THIS TEST. ACCIDENTAL DISCHARGE OF THE SQUIB CARTRIDGE CAN CAUSE INJURY TO PERSONS.
(7) Set the test box switch to ON.
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A 737-300/400/500MAINTENANCE MANUAL
APU FIRE EXTINGUISHER BOTTLE
FWDINBD
SQUIB TEST BOX
FIRE EXTINGUISHING SYSTEM TEST BOX
APU Fire Extinguishing System Test Figure 501
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S 765-016
(8)
Measure the resistance of the test box with a multimeter connected to the VOLTMETER jacks.
S 705-017
(9)
Write the results as (RL).
S 865-018
(10)
Remove the DO-NOT-CLOSE tags and close the EXTINGUISHER BOTTLES APU circuit breakers on the P6-2 panel.
S 755-019
(11)
Make sure all (3) IND LIGHTS and SEC 5 circuit breakers on the P6-3 panel are closed.
E. APU Squib Discharge Circuit Test
S 485-086
(1) Attach the applicable adapter cable to the connector of the squib test box.
NOTE: See the placard on the tester to determine the correct
____
adapter.
S 865-021
(2)
Set the switch on the test box to OFF.
S 865-022
(3)
Connect the D594 squib connector to the adapter cable on the test box.
S 865-023
(4)
Connect the multimeter, in the DC VOLTS position, to the squib test box.
S 865-024
(5)
Pull out the APU fire handle on the P8-1 panel to the emergency fire position.
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