0.015 (+/- 0.005) inch.
 (a)  Replace the fan if the clearance is not 0.015 (+/- 0.005) inch.

 (13)
 Install the fan (Ref 21-58-01/401).

 S 427-011
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A
747-400 MAINTENANCE MANUAL
 EQUIPMENT COOLING LOW FLOW DETECTOR - MAINTENANCE PRACTICES
___________________________________________________________
 1.  General_______
 A.  This procedure has instructions to do the tasks that follow:
 -
Equipment Cooling Low Flow Detector Removal.

 -
Equipment Cooling Low Flow Detector Cleaning.

 -
Equipment Cooling Low Flow Detector Installation.

 B.  There are two low flow detectors in the equipment cooling system. The low flow detector for the main E/E rack is installed in the supply duct below the floor of the forward cargo compartment at station 480. The low flow detector for the flight compartment is installed on top of the supply duct above the ceiling of the passenger compartment at station 254, WL 315, 10 feet (3 meters) from the pressure bulkhead.
 TASK 21-58-02-002-001
 2.  Equipment Cooling Low Flow Detector Removal (Fig. 201,202)___________________________________________
 A.  References
 (1)
24-22-00/201, Manual Control

 (2)
25-22-01/401, Main Passenger Cabin Ceiling Access Panels

 (3)
IPC 21-58-02 Fig. 1

 (4)
WDM 21-58-17

 (5)
SSM 21-58-02

 B.  Access
 (1)  Location Zone 122 Forward Cargo Compartment Forward Half, RH 211 Passenger Cabin Nose to First Door, LH
 C.  Prepare for the Removal
 S 862-002
 CAUTION: DO NOT OPERATE THE ELECTRICAL/ELECTRONIC EQUIPMENT WHEN YOU DO
_______ THIS PROCEDURE. IF YOU OPERATE THE ELECTRICAL EQUIPMENT WHEN THE EQUIPMENT COOLING SYSTEM IS OFF, YOU CAN CAUSE THE ELECTRICAL EQUIPMENT TO BECOME TOO HOT.
 (1) Remove the electrical power (Ref 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

747-400
MAINTENANCE MANUAL

SEE A LOW FLOW DETECTOR EQUIPMENT RACK MAIN ELECTRICAL 
1 DRIP SHIELD 
ELECTRICAL CONNECTOR 
LOW FLOW DETECTOR 

FWD
MAIN ELECTRICAL EQUIPMENT RACK LOW FLOW DETECTOR
A
NOT INSTALLED ON ALL AIRPLANES
1
Main Electrical Equipment Rack Low Flow Detector - Maintenance Practices
Figure 201

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747-400
MAINTENANCE MANUAL

AREA ABOVE PASSENGER COMPARTMENT CEILING SECTION 41 (MAIN DECK)
SEE A
VIDEO PROJECTOR
1
MAIN DECK PASSENGER COMPARTMENT SECTION 41
NOT INSTALLED ON ALL AIRPLANES1
Flight Deck Low Flow Detector - Maintenance Practices Figure 202 (Sheet 1)
F80570
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A

747-400 MAINTENANCE MANUAL
DRIP SHIELDS
FLIGHT DECK LOW FLOW DETECTOR (ABOVE THIS DRIP SHIELD)
SEE B
VIDEO PROJECTOR
　
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