(2)
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings
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A
747-400 MAINTENANCE MANUAL
(3) 32-09-02/201, Air/Ground Relay System
B. Prepare for the Test
S 865-112
(1) Supply electrical power (Ref 24-22-00/201).
NOTE: When the APU is used for electrical power, make sure that
____ all busses are powered (green) on the EICAS "ELEC" synoptic page.
S 015-138
(2) Access the E6/E9 valve.
NOTE: The E6/E9 valve is located below the floor of the forward
____ cargo compartment at station 520. Remove the left floor panel (at station 520) of the forward cargo compartment if necessary.
S 865-114
WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE SPECIFIED TASK TO
_______ PUT THE AIR/GROUND RELAY SYSTEM IN THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(3) Do the "Put the Air/Ground Relay System in the Air Mode" task (Ref 32-09-02/201).
C. E6/E9 Operational Test
S 735-115
(1) Do the cargo fire switch test:
(a) Make sure the airplane is in the air mode.
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747-400
MAINTENANCE MANUAL
(b)
Make sure the EQUIP COOLING switch on the P5 overhead panel is set to NORM.
COOLING AIRFLOW CAN CAUSE DAMAGE TO EQUIPMENT.
(c)
Set the CARGO FIRE FWD switch on the P5 overhead panel to ARMED.
(d)
Make sure that after 40 seconds these messages are not shown: ~.................................................. | EICAS caution | EQUIP COOLING | .................................................... | EICAS status | EE CLNG OVRD | .................................................... | EICAS status | FLT DK LOW FLOW | .................................................... | EICAS status | EQUIPMENT TEMP | .................................................... | EICAS status | EQUIP LOW FLOW | 2.....................…............................1
(e)
Make sure the E6/E9 valve is closed.
(f)
Set the CARGO FIRE FWD switch on the P5 overhead panel to off.
(g)
Make sure the E6/E9 valve is open.
(h)
Make sure that after 32 seconds there are no equipment cooling messages shown on EICAS.
(i)
Set the CARGO FIRE AFT switch on the P5 overhead panel to ARMED.
(j)
Make sure that after 40 seconds these messages are not shown: ~.................................................. | EICAS caution | EQUIP COOLING | .................................................... | EICAS status | EE CLNG OVRD | .................................................... | EICAS status | FLT DK LOW FLOW | .................................................... | EICAS status | EQUIPMENT TEMP | .................................................... | EICAS status | EQUIP LOW FLOW | 2.....................…............................1
(k)
Make sure the E6/E9 valve is closed.
(l)
Set the CARGO FIRE AFT switch on the P5 overhead panel to off.
(m)
Make sure the E6/E9 valve is open.
(n)
Make sure that after 32 seconds there are no equipment cooling messages shown on EICAS.
CAUTION:_______ DO NOT KEEP THE CARGO FIRE SWITCH IN THE ARMED POSITION
FOR MORE THAN FIVE MINUTES. BOTH EQUIPMENT COOLING FANS
WILL STOP. EXTENDED OPERATION OF AIRPLANE SYSTEMS WITHOUT
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