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A
747-400 MAINTENANCE MANUAL
S 715-124
(10)
Make sure the green APU SQUIB TEST light comes on.
S 865-125
(11)
Release the TEST 2 button.
S 715-126
(12)
Make sure the APU SQUIB TEST light goes off.
S 865-127
(13)
Push the TEST 1 and the TEST 2 buttons at the same time.
S 715-128
(14)
Make sure the APU SQUIB TEST lights stay off.
S 865-063
(15)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
APU FIRE EXTINGUISHER BOTTLE - REMOVAL/INSTALLATION
___________________________________________________
1. General_______
A. Two tasks are given in this section. The first is the removal of APU fire extinguisher bottle M103. The second is the installation of APU fire extinguisher bottle.
B. The fire bottle M103 is located on forward side of the left lower corner of the firewall. You can get to the fire bottle through access door 315AL below the forward side of the firewall.
C. The fire bottle M103 volume is 650 cubic inches and capacity is 18.0 +0.25/-0.00 pounds of Halon 1301.
TASK 26-22-01-004-001
2. Remove APU Fire Extinguisher Bottle (Fig. 401)___________________________________
A. Equipment
(1) Squib Protective Cover
M83723/60-110-AN or AC
B. References
(1)
AMM 06-09-00/201, Empennage (Major Zone 300) Access Doors and Panels
(2)
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices
(3)
IPC 26-22-11 Fig. 02
(4)
WDM 26-22-11
(5)
SSM 26-22-01
C. Access
(1)
Location Zone 315 Area Aft of Stabilizer Box Compartment, LH
(2)
Access Panel
315 AL Access Door
D. Procedure
S 864-050
WARNING:_______DO NOT TOUCH THE PNEUMATIC DUCTS WHEN THEY ARE HOT. WHEN THE DUCTS ARE HOT THEY CAN CAUSE INJURY TO PERSONS.
(1) Open the circuit breaker 6H5 FIRE EXTINGUISHER APU on P6 main power distribution panel and attach a DO-NOT-CLOSE tag.
S 014-003
WARNING:_______DO NOT STAND ON ACCESS DOOR 315AL. THE SPRING LOADED LATCHES WOULD RELEASE AND YOU WOULD FALL AND INJURE YOURSELF.
(2) Open the controls bay access door, 315AL (AMM 06-09-00/201).
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