B. Tests
(1)
Circuit Test (AMM 26-20-0/501)
(a) This test will make sure that the smoke detection circuit and all the components operate correctly. When you push the TEST switch on the cargo fire control panel, (P8), it will initiate a test of the CEU. The CEU will initiate a test of all the smoke detectors and will initiate the fire warning indications.
(2)
Smoke Test (AMM 26-20-0/501)
(a) This test will make sure that the smoke detectors and the smoke detection circuit operate correctly. Supply a set amount of smoke near one of the smoke detectors and ensure all the fire warning indications come on.
C. Manual Operation
(1)
Supply Electrical Power (AMM 24-22-0/201).
(2)
Close these circuit breakers, on the circuit breaker panel P6 or P18:
(a)
CARGO FIRE FWD DET A
(b)
CARGO FIRE FWD DET B
(c)
CARGO FIRE AFT DET A
(d)
CARGO FIRE AFT DET B
500
26-20-0 Page 6 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
CARGO COMPARTMENT SMOKE DETECTION - ADJUSTMENT/TEST
EFFECTIVITY
737-200 Passenger Airplanes Incorporating SB 26A1081
1. General
A. Both lower cargo compartments have smoke detectors installed in the ceiling. When the concentration of smoke at the sensor gets to a preset threshold, the smoke detector alarm sounds.
B. This procedure consists of these tasks:
(1)
Cargo Smoke Detection - Operational Test
(2)
Cargo Smoke Detection - Smoke Test
2. Cargo Smoke Detection - Operational Test (Fig. 501)
A. References
(1) Manual Control - Maintenance Practices (Apply Power)(AMM 24-22-0/201).
B. Access
(1) Location Zones
(a)
121 Control Cabin - Left
(b)
122 Control Cabin - Right
C. Prepare for the Operational Test
(1)
Supply Electrical Power, Manual Control - Maintenance Practices (Apply Power) (AMM 24-22-0/201).
(2)
Ensure these circuit breakers are closed:
(a) Circuit breaker panel P6 or P18:
1) CARGO FIRE FWD DET A
2) CARGO FIRE FWD DET B
3) CARGO FIRE AFT DET A
4) CARGO FIRE AFT DET B
(3)
Ensure the FWD and AFT DET SELECT switches on cargo fire control panel (P8), are in the NORM position.
(4)
Depress and hold the TEST switch on cargo fire control panel (P8).
(a) Look for these results which will indicate a properly working system: 1) The Fire Warning Bell will sound after a momentary delay. 2) The Captain and First Officers’ FIRE WARN lights (Red) will illuminate on Pilots’
lightshield panel (P7). 3) Push the Captain or First Officers’ FIRE WARN switch to cancel the FIRE WARN light (Red) on Pilots’ lightshield panel (P7), and the Fire Warning Bell. 4) Verify the FIRE WARN light (Red) and the Fire Warning Bell cancel.
NOTE: If you push either of the FIRE WARN lights, or the BELL CUTOUT switch on the Engine and APU Fire Control Panel, the same conditions occur. The FIRE WARN and BELL CUTOUT switches cause the same resets, but from different locations.
5) Both Cargo Fire FWD and AFT (Red) warning lights will illuminate. 6) Verify the DETECTOR FAULT light (Amber) remains off.
May 01/99 26-20-0 Page 501
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K13321 K13323
Cargo Bay Smoke Detection Test 550
26-20-0 Figure 501 (Sheet 1) May 01/99
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
550 Cargo Bay Smoke Detection Test
May 01/99 Figure 501 (Sheet 2) 26-20-0
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
NOTE: If the DETECTOR FAULT light (Amber) illuminates, this indicates one of the selected detectors has failed to respond to the test or the Cargo Electronic Unit (CEU) or a Detector has a power failure.
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