DISCHARGE
PORT SCREEN
SQUIB
SEE C
DISCHARGE ASSEMBLY
ELECTRICAL
B CONNECTOR C
Engine Fire Extinguishing System Component Location
Figure 501
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D.
E.
F.
A
757
MAINTENANCE MANUAL
Prepare for Test
S 865-001
(1) Supply electrical power (AMM 24-22-00/201).Do a test of the Extinguisher Bottle Pressure Switch
S 825-256
CAUTION: IF THE HEX KEY IS ROTATED MORE THAN 1/4 TURN, DAMAGE TO THE
_______ SWITCH MAY OCCUR.
(1) On engine fire extinguisher bottle number 1, turn and hold the ground test hex key 1/4 turn counterclockwise.
(a)
Make sure the yellow ENG BTL 1 DISCH light on the ENGINE FIRE Control Panel, P8, comes on.
(b)
Make sure the EICAS message, ENG BTL 1, shows on the top display.
S 865-005
(2) Release the ground test hex key.
(a)
Make sure the yellow ENG BTL 1 DISCH light goes off.
(b)
Make sure the EICAS message, ENG BTL 1, does not show on the top display.
S 825-007
(3) On engine fire extinguisher bottle number 2, turn and hold the ground test hex key counterclockwise.
(a)
Make sure the yellow ENG BTL 2 DISCH light on the ENGINE FIRE Control Panel, P8, comes on.
(b)
Make sure the EICAS message, ENG BTL 2, shows on the top display.
S 865-010
(4) Release the ground test hex key.
(a)
Make sure the yellow ENG BTL 2 DISCH light goes off.
(b)
Make sure the EICAS message, ENG BTL 2, does not show on the
top display.Do a test of the Extinguisher Bottle Squib Test Circuit
S 715-012
(1) On the SQUIB TEST Control Panel, P61, push and hold the TEST switch.
(a) Make sure the green ENG L (1 and 2) and ENG R (1 and 2) squib test lights come on.
S 865-094
(2)
Release the TEST switch.
(a) Make sure the green ENG L (1 and 2) and ENG R (1 and 2) squib test lights go off.
(3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-017
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757 MAINTENANCE MANUAL
TASK 26-21-00-735-201
3. System Test
___________
A. General
(1) The engine fire extinguishing system has two identical fire bottles located in the forward of the aft cargo compartment, an engine fire control panel, and a squib test panel. The extinguishing plumbing is connected to the left and right engine, which lets each engine receive extinguishing agent from either bottle. Each engine has an independently operated fire extinguishing system.
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.
(2) Before you touch the squib, do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-01/201).
B. Equipment
(1) Electrical Test Equipment - Bottle Squib, Fire
Extinguisher System - A26001-165
NOTE: The A26001 test boxes do not include the test adapters.
____ Refer to the A26001 drawing for the required test adapter cables.
(2)
Squib Protective Covers
M83723/60-112-AN or AC
M83723/60-110-AN or AC
M83723/60-210-AN or AC
M83723/60-108-AN or AC
(3)
Voltmeter - 28 vdc
(4)
Resistor - 10 kohms or greater
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