(2)
IPC 21-26-03 Fig. 1
(3)
WDM 21-27-11
(4)
SSM 21-27-01
B. Access
(1) Location Zone
123 Forward Cargo Compartment Aft Half, LH
C. Prepare for the Removal
S 864-022
(1)
Make sure the FWD CARGO VENT switch on the P86 panel is set to OFF.
S 864-023
(2)
Open these circuit breakers and attach DO-NOT-CLOSE identifiers:
(a)
Overhead Circuit Breaker Panel, P180 1) 180H2, LWR FWD CARGO VENT FAN PWR 1 (Forward Fan) 2) 180H5, LWR FWD CARGO VENT FAN PWR 2 (Aft Fan)
(b)
Left Power Distribution Center, P414 1) 414E10, CARGO VENT FWD CONT
S 014-024
(3)
Remove the forward cargo compartment ceiling lining outboard of the ceiling diffuser to get access to the fan (AMM 25-52-01/401).
S 034-025
(4)
Disconnect the electrical connector from the applicable fan:
(a)
DB8643 (Forward Fan)
(b)
DB8642 (Aft Fan)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-26-10
ALL ú ú 02F Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
FORWARD CARGO
VENTILATION
FAN
SEE A
ELECTRICAL
CONNECTOR SLEEVE CLAMP
FAN (2 LOCATIONS) FWD
INBD
FAN INLET
CLAMP
NUT, BOLT, WASHERS (2 LOCATIONS) NUT, BOLT, WASHERS (2 LOCATIONS)
INLET SCREEN/CHECK
VALVE ASSEMBLY
A
Forward Cargo Ventilation Fan - Installation Figure 401
C76870
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-26-10
ALL ú ú 01F Page 402 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 034-027
(5)
Remove the fan inlet clamp.
S 034-028
(6)
Remove the clamps at both ends of the fan.
S 034-041
(7)
Pull the sleeve from the inboard end of the fan and the flex duct from the outboard end of the fan.
S 034-042
(8)
Remove the inlet screen/check valve assembly with the rubber sleeve from the fan.
S 034-043
(9)
Remove the nuts, bolts and washers from the lug at the aft end of the fan.
S 034-044
(10)
Remove the nuts, bolts, and washers from the lug at the forward end of the fan.
S 424-049
(11)
Remove the fan.
S 434-048
(12)
Put a cover over the duct opening.
TASK 21-26-10-404-029
3. Forward Cargo Ventilation Fan Installation (Fig. 401)__________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings
(3)
IPC 21-26-03 Fig. 1
(4)
WDM 21-27-11
(5)
SSM 21-27-01
B. Access
(1) Location Zone 121 Forward Cargo Compartment Forward Half, LH 123 Forward Cargo Compartment Aft Half, LH
C. Install the Fan
S 034-045
(1)
Remove the cover from the duct opening.
(a) Make sure there is no unwanted material in the duct.
(2)
Put the fan in its position with the flow arrow pointed outboard.
S 984-030
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