S 434-008
CAUTION: YOU MUST INSTALL THE FILTER/DRYER IN THE CORRECT POSITION AND
_______ FLOW DIRECTION (THE WORD "IN" IS STAMPED ON THE INLET FACE AND AN ARROW IS PAINTED ON THE BODY TO INDICATE FLOW DIRECTION). IF IT IS INSTALLED INCORRECTLY, THE SYSTEM WILL NOT OPERATE CORRECTLY.
(3) Connect the tubing to the inlet and outlet of the filter/dryer.
(a) Make sure that the filter/dryer is installed tightly on the tubing.
S 864-010
(4)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P6 panel:
(a) 6H6, FIRE EXTINGUISHER LOWER CARGO
(5)
Do the System Test for Metered Discharge Line (AMM 26-23-00/501).
S 734-011
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A
747-400 MAINTENANCE MANUAL
LOWER CARGO COMPARTMENT FIRE EXTINGUISHER BOTTLE TIME DELAY -
_______________________________________________________ INSPECTION/CHECK
________________
1. General_______
A. This procedure contains one task which makes sure these systems operate correctly:
-Forward and aft lock-in relays
-
The 30 minute time delay relay
-
The air/ground bypass relay in the cargo fire extinguishing system.
TASK 26-23-05-736-120
2. System Test___________
A. Special Tools and Equipment
(1) A26002-54, Time Delay, Cargo Fire Extinguisher Bottle Test Box (Optional)
NOTE: The A62002 test tool facilitates the check of the 30 minute
____ time delay relay. A clock timer may be used if the A26002 tool is not available.
(2) G26001-105, Squib Test Box
NOTE:____Adapter cables are included with the squib test box. Refer to drawing number G26001 for the applicable adapters and connectors for the cargo fire bottles squibs.
B. Standard Tools and Equipment
(1)
Multimeter - 0-1000 volts dc 1%, 0-750 volts ac, 0-2 amps, 0-2 megohms - commercially available
(2)
Voltmeter - with a 10k ohm or greater resistance
(3)
Squib Protective Covers
M83723-208-AN or -AC (Fwd squib)
M83723-210-AN or -AC (Aft squib)
(4)
Clock timer (optional, used if A26002 tool is not available)
C. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 32-09-02/201, Air/Ground Relay System
(3)
WDM 26-23-11 and WDM 26-23-12
(4)
SSM 26-23-01
D. Prepare for Test
S 866-001
(1)
Supply electrical power (AMM 24-22-00/201).
S 866-002
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel 1) 6H6, FIRE EXTINGUISHER LOWER CARGO 2) 6L4, FLT DECK LIGHT CAPT IND
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747-400
MAINTENANCE MANUAL
(b) AIRPLANES WITH DUAL CARGO HEAT OR AFT CARGO AIR CONDITIONING; P180 DC power distribution panel: 1) 180E9, CARGO VENT FLAPPER
S 866-121
(3)
Make sure the FWD and AFT ARM switches are disarmed (in the released position).
S 866-003
(4)
Get access to the lower cargo compartment.
S 036-004
(5)
Disconnect the electrical connectors from these fire extinguisher
bottles:
~...................................................
| BOTTLE | ELECTRICAL CONNECTOR |
.....................................................
| BOTTLE A FWD SQUIB | DM7906B |
.....................................................
| BOTTLE A AFT SQUIB | DM7906C |
.....................................................
| BOTTLE B FWD SQUIB | DM7907B |
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