(2)
Cargo Compartment Smoke Detector - Removal/Installation (AMM 26-20-11/401)
B. Equipment
(1)
Air Source - Regulated, Dry Filtered, 0-10 psig
(2)
Gloves-Rubber (Commercially available)
(3)
Pocket Scale
C. Consumable Materials
(1)
B00065 Alcohol, Denatured 0-A-396
(2)
B00541 Cleaner, General Purpose Detergent P-D-220
(3)
G0034 Cloth, Process Cleaning Absorbent Wiper (cheesecloth, gauze) BMS15-5
D. Access
(1)
Location Zones
(a)
213 Forward Cargo Compartment
(b)
215 Aft Cargo Compartment
(2)
Access Panels
(a)
4404R, Forward Cargo Door
(b)
4504R, Aft Cargo Door
E. Clean the Smoke Detector
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(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
WARNING: WHEN YOU CLEAN THE SMOKE DETECTOR AND SENSOR, ENSURE THE AREA HAS SUFFICIENT VENTILATION. KEEP ALCOHOL AWAY FROM HEAT, SPARKS OR FLAMES. DO NOT BREATHE FUMES FROM ALCOHOL. WEAR RUBBER GLOVES. ALCOHOL IS A FLAMMABLE AND POISONOUS SOLVENT WHICH CAN CAUSE INJURIES TO PERSONNEL AND DAMAGE EQUIPMENT.
(2)
Open 4404R, Forward Cargo Door or 4504R, Aft Cargo Door.
(3)
Remove smoke detector (AMM 26-20-11/401).
(4)
Put on rubber gloves
(5)
Remove dirt from the exterior of smoke detector with BMS15-5 cloth, soaked with 0-A-396 alcohol.
May 01/99 26-20-11 Page 701
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(6)
Perform the following steps to disassemble smoke detector:
(a)
Insert a thin-edged pocket scale between smoke sensor and smoke detector.
(b)
Push lock release lever with pocket scale, then pull out smoke sensor.
(c)
Slide screwdriver between sensor assembly and sensor cover.
(d)
Twist screwdriver to release lock on sensor cover.
(e)
Remove sensor cover from sensor assembly.
CAUTION: DO NOT TOUCH ELECTRODE IN SENSOR ASSEMBLY OR DAMAGE TO SMOKE SENSOR CAN OCCUR.
(f)
Pull out mesh from sensor assembly.
(7)
Perform these steps to clean mesh and sensor assembly.
(a)
Examine mesh for dirt or other contamination.
(b)
If mesh is dirty, wash with P-D-220 cleaner and lukewarm water.
(c)
If mesh is very dirty, replace with new mesh.
(d)
Dry mesh completely with dry filtered air source (0-10 psig).
CAUTION: BLOW AIR LIGHTLY INTO THE SENSOR ASSEMBLY. IF AIR IS BLOWN WITH TOO MUCH FORCE, IT CAN CAUSE A STATIC CHARGE ON THE ELECTRODES WHICH COULD CAUSE DAMAGE TO SMOKE SENSOR.
(e)
Lightly blow any dirt or particles out of detector assembly with air source (0-10 psig).
(8)
Perform these steps to install smoke detector.
(a)
Install mesh on sensor assembly.
(b)
Align sensor cover with applicable hole in sensor assembly.
(c)
Install sensor cover, sensor assembly, and smoke sensor.
(9)
Install smoke detector (AMM 26-20-11/401).
(10)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(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
(11)
Perform the Cargo Compartment Smoke Detection Operational Test (AMM 26-20-0/501).
F. Return Airplane to its Normal Condition
(1)
Close 4404R, Forward Cargo Door, or 4504R, Aft Cargo Door.
(2)
Remove electrical power if not needed (AMM 24-22-0/201).
550
26-20-11 Page 702 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
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