SUPPLY DUCT
FLIGHT DECK LOW FLOW DETECTOR
B

Flight Deck Low Flow Detector - Maintenance Practices
Figure 202 (Sheet 2)

F80604
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 21-58-02
 ALL  ú ú 01 Page 204 ú Jun 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 412-003
 (2)  To remove the flight compartment detector, do the step that follow:
 (a)  
Remove the ceiling panel on the left side of the main compartment, approximately 10 feet (305 cm) aft of the forward bulkhead (Ref 25-22-01/401).

 (b)  
Remove the inboard-most dripshield which is on the left side of the airplane centerline:

 NOTE: There are four dripshields installed above the ceiling
____ panels along the airplane centerline. Two of the dripshields are on the left side of the airplane centerline and the other two dripshields are on the right side of the airplane centerline. Access to the flight deck low flow detector is thru the inboard-most dripshield on the left side of the airplane centerline.
 1)  Use a bucket to collect the water which remains in the dripshields while you disconnect the four drain tubes from the inboard-most dripshield.
 2)  Remove the four fasteners (screw, nut, and two washers) from the upper side of the inboard-most dripshield which attach it to the other dripshields.
 3)  Remove the two fasteners (screw, washer, and gasket) from the lower side of the inboard-most dripshield which hold it to the structure.
 4)  Remove the inboard-most dripshield.
 D.  Remove the Detector
 S 032-005
 (1)  Disconnect the electrical connector from the detector.
 (a)  
Main E/E rack detector DM7934

 (b)  
Flight deck detector DM7933

 S 032-026
 (2)  
Cut and remove the lockwire from the detector.

 (3)  
Remove the dripshield.

 (4)  
Remove the detector.

 (5)  
Put a cover on the duct opening.

 S 032-040
 S 022-006
 S 032-007
 TASK 21-58-02-102-035
 3.  Equipment Cooling Low Flow Detector Cleaning (Fig. 201,202)____________________________________________
 A.  Consumable Materials
 (1)  
B00769 Alcohol - Isopropyl

 (2)  
G01043 Cloth - Lint Free

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 21-58-02
 ALL  ú ú 02 Page 205 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. References
 (1)  
21-58-02/201, Equipment Cooling Low Flow Detector

 (2)  
IPC 21-58-02 Fig. 1

 (3)  
WDM 21-58-17

 (4)  
SSM 21-58-02

 C. Access
 (1)  Location Zone 122 Forward Cargo Compartment Forward Half, RH 211 Passenger Cabin Nose to First Door, LH
 D. Do the Procedure
 S 022-036
 (1)  
Do the Equipment Cooling Low Flow Detector Removal (Ref 21-58-02/201).

 S 162-037

 (2)  
Clean the Detector.

 CAUTION:_______BE CAREFUL WHEN YOU HOLD THE DETECTOR. YOU CAN EASILY CAUSE DAMAGE TO THE DETECTOR PROBE IF YOU DO NOT HOLD IT CAREFULLY.
 (a)  
Remove the lint and the dirt from the detector.

 (b)  
Use the alchohol and the cloth to clean the detector probe.

 S 422-038
 (3)  Do the Equipment Cooling Low Flow Detector Installation (Ref 21-58-02/201).
 TASK 21-58-02-402-008
 4.  Equipment Cooling Low Flow Detector Installation (Fig. 201,202)________________________________________________
 A. References
 (1)  
20-11-28/401, Lockwire

 (2)  
21-58-00/501, Equipment Cooling System
　
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