(c)
When the flow selector is set to HIGH (FWD or AFT), the cabin shutoff valve will close and the flow regulating valve will go to its full open position. All of the pack flow will therefore be diverted to the applicable cargo zone.
(3)
In the event of a fire condition in the cargo compartment, The cabin shutoff valves will open and the flow regulating valves will close. This will stop the flow of air to the cargo compartments and will allow flow of air to continue to the main and upper deck areas.
B. Control
(1)
Operate the air conditioning packs (AMM 21-00-00/201).
(2)
Set the desired flow rate on the LOWER LOBE CARGO COND AIR FLOW RATE selector on the overhead P461 panel.
(3)
Select the compartment temperature on the LOWER LOBE TEMP selector switch on the overhead P5 panel.
(4)
To shut down the cargo air conditioning system set the LOWER LOBE CARGO COND AIR FLOW RATE selector to OFF.
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A
747-400
MAINTENANCE MANUAL
CARGO AIR CONDITIONING AIR DISTRIBUTION DISPLAYS
EICAS ECS MAINTENANCE PAGE
Cargo Compartment Conditioned Air Distribution - EICAS Display
Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
D09454
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747-400 MAINTENANCE MANUAL
(5) Shut down the air conditioning packs (AMM 21-00-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CARGO COMPARTMENT CONDITIONED AIR DISTRIBUTION - ADJUSTMENT TEST
________________________________________________________________
1. General_______
A. This procedure gives the instructions to do the lower lobe cargo air conditioning ground test
TASK 21-28-00-705-001
2. Lower Lobe Cargo Air Conditioning Ground Test_____________________________________________
A. General
(1)
The ground test for the lower lobe cargo air conditioning system commands these conditions to occur:
(a)
The forward and aft cargo flow regulating valves to open and close.
(b)
The forward and aft cabin shutoff valves to open and close.
(c)
The forward and aft cargo trim shutoff valves to open and close.
(2)
If one of the valves does not move to its commanded position, then the ground test fails.
B. References
(1) 24-22-00/201, Manual Control
C. Access
(1) Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
D. Prepare for the test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-015
(2)
Make sure the following switches on the overhead P5 panel are set as follows:
(a)
All the ZONE TEMP selectors to AUTO.
(b)
All the PACK selectors to OFF.
(c)
The TRIM AIR switch to OFF.
(d)
The HIGH FLOW switch to OFF.
S 865-007
(3)
Make sure the LOWER LOBE CARGO COND AIR FLOW RATE selector on the overhead P461 panel is set to OFF.
(4)
Push the PACK RESET switch.
(5)
Push the ZONE RESET switch.
S 865-008
S 865-009
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