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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 715-006
(2)
Make sure the squib indicating light for the APU comes on (green).
S 865-007
(3)
Release the TEST 1 switch.
S 715-008
(4)
Make sure the indicating light goes off.
S 865-009
(5)
Push and hold the TEST 2 switch on the squib test module, M7327.
S 715-010
(6)
Make sure the squib indicating light for the APU comes on (green).
S 865-011
(7)
Release the TEST 2 switch.
S 715-012
(8)
Make sure the squib indicating light goes off.
S 865-013
(9)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 26-22-00-735-014
3. System Test
___________
A. Special Tools and Equipment
(1)
G26001 - Squib Circuit Test Box
B.
Standard Tools and Equipment
(1)
Voltmeter - 28 vdc
(2)
Resistor - 10 Kohm
(3)
Squib Protective Covers
M83723/60-110-AN or AC
(4)
Multimeter - Fluke 8020 (or equivalent)
(5)
Jumper Wire
(6)
Resistor - (300 to 400 ohms)
C.
References
(1)
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 32-09-02/201, Air/Ground Relay System
(4)
IPC 26-22-01 Fig.2
(5)
WDM 26-22-11, Fire Extinguishing - APU
(6)
SSM 26-22-01
D.
Access
(1)
Location Zone 220 Control Cabin 315 Area Aft of Stabilizer Box Compartment, LH
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(2) Access Panel
315AL Access Door
E. Prepare for the Tests
S 865-015
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-016
(2)
Open these circuit breakers on the main power distribution panel, P6, and attach DO-NOT-CLOSE tags:
(a)
6H5, FIRE EXTINGUISHER APU
(b)
6L4, FLIGHT DECK LIGHT CAPT IND
S 015-018
(3) Get access to the fire extinguisher bottle for the APU through the access door, 315AL (AMM 06-09-00/201).
S 865-219
WARNING:_______DO NOT TOUCH THE PNEUMATIC DUCTS WHEN THEY ARE HOT. WHEN THE DUCTS ARE HOT THEY CAN CAUSE INJURY TO PERSONS.
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 BOTTLES 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 20-41-02/201).
S 035-019
(5)
Remove the electrical connector, DM103B, from the APU bottle squib.
S 425-145
WARNING:_______PUT A PROTECTIVE COVER ON THE FIRE BOTTLE SQUIBS. IF YOU DO NOT PUT PROTECTIVE COVERS ON THE FIRE BOTTLE SQUIBS, THE FIRE BOTTLES CAN RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.
CAUTION:_______DO NOT PUT SHUNT PLUGS ON THE FIRE BOTTLE SQUIBS. THE SHUNT PLUGS CAN CAUSE DAMAGE TO THE SQUIB PINS.
(6) Put a protective cover on the fire bottle squib.
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