CASE
ELECTRICAL CONNECTOR

____FACE PLATE ATTACHING SCREWS ARE NOT REMOVABLE
NOTE:
LANYARD
LOCK RELEASE MECHANISM FOR SMOKE SENSOR
FACE PLATE
(2 LOCATIONS)
Aft Upper Deck Crew Rest Area Smoke Detector Cleaning
Figure 701 (Sheet 1)

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E51207
A

747-400 MAINTENANCE MANUAL
SMOKE SENSOR
SEE C
PULL SMOKE SENSOROUT
POCKET SCALE
LOCK RELEASE LEVER FOR SMOKE SENSOR
PUSH
LAVATORY SMOKE DETECTOR
B
ELECTRODES
SCREWDRIVER SENSOR ASSEMBLY
MESH
SENSOR
ASSEMBLY

COVER
SENSOR COVER
SMOKE SENSOR
C
Aft Upper Deck Crew Rest Area Smoke Detector Cleaning
Figure 701 (Sheet 2)

E51212
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A
747-400 MAINTENANCE MANUAL
 S 027-007
 (6)  
Remove the smoke sensor from the smoke detector assembly. S 867-008

 (7)  
Slide the blade of the standard screwdriver between the smoke sensor and the cover.

 S 017-009

 (8)  
Remove the cover from the smoke sensor.

 S 027-010 WARNING: A SMALL QUANTITY OF RADIOACTIVE MATERIAL (AM241, 0.7 MICROCI)
_______ IS SEALED IN THE SENSOR ASSEMBLY. DO NOT DISASSEMBLY THE SENSOR ASSEMBLY
 CAUTION:_______DO NOT TOUCH THE ELECTRODE INSIDE OF THE SENSOR. THIS CAN CAUSE DAMAGE TO THE SENSOR.
 (9)  
Pull out the mesh from the smoke sensor. S 967-011

 (10)
 If the mesh is very dirty, replace it with a new mesh. S 177-012

 (11)
 If the mesh is dirty, wash it with synthetic detergent and luke-warm water.

 S 167-013

 (12)
 If you wash the mesh, dry it with compressed air. S 167-014

 CAUTION:_______DO NOT BLOW VIOLENTLY INTO THE SMOKE DETECTOR CHAMBER. THIS CAN CAUSE STATIC ELECTRICITY AND DAMAGE TO THE ELECTRODES.

 (13)
 Lightly blow out the dust in the chamber. S 417-015

 (14)
 Install the mesh, smoke sensor and cover. NOTE: Align the cover with the applicable hole in the sensor top.

____
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A
747-400 MAINTENANCE MANUAL
 S 437-016
 (15)
 Install the detector assembly (Ref 26-14-51/401).

 S 717-017

 (16)
 Do the aft upper deck crew rest area smoke detector test (Ref 26-14-50/501).

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 1.

2.

3.

A
747-400 MAINTENANCE MANUAL
 APU FIRE DETECTION SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________
General (Fig. 1)
_______
 A.  A dual-loop fire detection system is installed in the APU compartment. This system monitors temperatures in the compartment, and provides alert for a fire condition.
 B.  The APU fire detection sytem uses power from the 28-volts dc battery bus and bus No. 1. The system circuit breakers are on P6 main power distribution panel. The system contains no on/off switches.
 C.  The system is composed of two loops. Each loop has two detector elements electrically connected in parallel, so that either element can trigger an alarm or fault for that loop.
　
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