(f)
Depress the FWD ARM switch on the cargo fire control panel (P8), to normal position.
(6)
Perform a test of the cargo fire bottle aft squib circuit.
(a)
Use a multimeter to perform a check for less than 1 volt dc between pins 1 and 3 on connector D12796.
(b)
Depress the AFT ARM switch on the cargo fire control panel (P8), to the ARMED position. 1) The ARMED light (White) will illuminate.
(c)
Depress and hold the DISCH switch on the cargo fire control panel.
(d)
Perform a check for more than 16 volt dc between pins 1 and 3 on connector D12796.
(e)
Release the DISCH switch on the cargo fire control panel (P8).
1) Voltage at connector D12796 will read 0 volt dc.
(f)
Depress the FWD ARM switch on the cargo fire control panel (P8), to the normal position.
(7)
Open this circuit breaker and install DO-NOT-CLOSE tag:
(a) Circuit breaker panel P6 or P18:
1) CARGO FIRE EXT 1
(8)
Remove protective covers from squibs.
(9)
Connect electrical connectors to FWD and AFT squibs.
(a)
Connect D12794 connector to FWD squib M2249.
(b)
Connect D12796 connector to AFT squib M2250.
(10)
Remove DO-NOT-CLOSE tag and close this circuit breaker:
(a) Circuit breaker panel P6 or P18:
1) CARGO FIRE EXT 1
(11)
Depress and hold TEST switch on cargo fire control panel (P8).
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(a) Ensure the FWD EXT and AFT EXT lights (Green) illuminate.
NOTE: Other indications may occur during this test. The other indications are not important for this test.
(12) Release the cargo fire control TEST switch.
G. Return the Airplane to its Normal Condition.
(1)
If removed, install air conditioning duct in front of the cargo fire bottle
(AMM 21-21-11/401).
(2)
Install the lining at aft end of forward cargo compartment (AMM 25-52-131/401).
(3)
Close 4404R, Forward Cargo Door.
(4)
Remove electrical power if not needed (AMM 24-22-0/201).
3. Fire Extinguishing Bottle Pressure Switch Test (Fig. 501)
A. General
(1) The pressure switch test should be performed every time the cargo fire control panel (P8), or the pressure switch is disconnected from the airplane wiring.
B. References
(1) Supply Electrical Power, Manual Control - Maintenance Practices (Apply Power) (AMM 24-22-0/201).
C. Access
(1)
Location Zones
(a)
213 Forward Cargo Compartment
(b)
214 Mix Manifold Bay
(c)
121 Control Cabin - Left
(d)
122 Control Cabin - Right
(2)
Access Panels
(a) 4404R, Forward Cargo Door
550
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K13405 K13262
Cargo Bay Fire Extinguishing Test 550
26-25-0 Figure 501 (Sheet 1) May 01/99
Page 504
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550 Cargo Bay Fire Extinguishing Test
May 01/01 Figure 501 (Sheet 2) 26-25-0
Page 505
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D. Prepare for the Test
(1)
Supply Electrical Power, Manual Control - Maintenance Practices (Apply Power) (AMM 24-22-0/201).
(2)
Open this circuit breaker and install DO-NOT-CLOSE tag:
(a) Circuit Breaker Panel P6 or P18:
1) CARGO FIRE EXT 1
(3)
Open 4404R, Forward Cargo Door
(4)
Remove lining at the aft end of forward cargo compartment to access the cargo compartment fire bottle (AMM 25-52-131/401).
E. Pressure Switch Test
(1)
Remove connector from pressure switch D12816 from the pressure switch.
(2)
Install a jumper between pins 2 and 3 on the connector D12816.
(a) Make sure the DISCH light on the cargo fire control panel (P8) comes on.
(3)
Remove the jumper from the connector D12816.
(a) Ensure the DISCH light on the cargo fire control panel (P8), goes out
F. Return Airplane to its Normal Condition
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