26-22-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
F. Test the APU/CARGO FIRE Control Panel installation by use of the ENG/APU/CARGO test switch on FIRE/OVHT Test Panel, M10445.
S 864-034
(1)
Supply electrical power (AMM 24-22-00).
S 864-035
(2)
Make sure these systems operate:
(a)
EICAS (AMM 31-41-00).
(b)
Warning System (AMM 31-51-00).
(c)
Master Dim and Test System (AMM 33-16-00).
S 284-040
(3)
Try to pull the APU fire switch handle out, on the aft pilot's control stand, P8. See that it is locked in place.
S 864-041
(4)
Push the ECS/MSG switch on the EICAS MAINT panel on the right side panel, P61.
S 864-042
(5)
Push and hold the ENG/APU/CARGO test switch on the FIRE/OVHT Test Panel, P8.
NOTE: Use the ECS/MSG switch as necessary to advance EICAS pages
____
until all messages have been shown.
(a)
Make sure that the EICAS maintenance messages APU FIRE LP 1 and 2 are shown on the bottom display.
(b)
After a 2-4 second delay, make sure that these conditions occur: 1) The red APU fire switch handle, on P8, lights up. 2) The red FIRE light, on captain's instrument panel P1-3,
comes on.
3) The EICAS warning message, APU FIRE, is shown on the top display.
4) The red master WARNING lights, on glareshield panels P7, come on.
5) The fire bell can be heard on the flight deck aural warning speakers.
6) The red APU FIRE light, on Lts/APU/Interphone panel P62, comes on. P62 is located on the right side of the nose landing gear.
7) The APU fire warning horn, on P62, can be heard, when the airplane is on the ground.
S 864-045
(6) Pull the APU fire switch handle out (P8). Do NOT turn the handle.
(a) Make sure these conditions occur: 1) The fire bell goes off. 2) The red APU FIRE light (on P62) goes off.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
3) The APU fire warning horn stops.
S 864-047
(7)
Push the APU fire switch back in.
S 864-048
(8)
Release the ENG/APU/CARGO switch.
(a) Make sure that all the above conditions stop.
S 864-001
(9) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11B20, FIRE DETECTION L ENGINE 1
(b)
11B21, FIRE DETECTION L ENGINE 2
(c)
11B22, FIRE DETECTION R ENGINE 1
(d)
11B23, FIRE DETECTION R ENGINE 2
(e)
GUN 051;
11B26, CARGO SMOKE FIRE DET 1
(f)
GUN 051;
11B27, CARGO SMOKE FIRE DET 2
(g)
GUN 001-050, 051-999;
11B26, FIRE DETECTION CARGO 1
(h)
ON ALL EXCEPT GUN 051;
11B27, FIRE DETECTION CARGO 2
(i)
11J24, FIRE DET ALTN PWR CARGO
(j)
11J25, FIRE DET ALTN PWR APU
(k)
11J26, FIRE DET ALTN PWR ENGINE LEFT
(l)
11J27, FIRE DET ALTN PWR ENGINE RIGHT
G. Test the APU/CARGO FIRE Control Panel installation by use of the pressure switch manual-override button.
S 864-050
(1) Make sure that this circuit breaker on the P6 panel is closed:
(a) 6G1, FIRE EXTINGUISHING APU
S 014-021
WARNING: STAY OFF THE SERVICE ACCESS DOOR, 311AL AND THE ELEVATOR
_______ CONTROL ACCESS DOOR, 313AL. YOUR WEIGHT CAN CAUSE THE SPRING-LOADED LATCHES TO RELEASE. IF YOU FALL THROUGH THE DOOR, INJURY CAN OCCUR.
(2) Open the controls bay access door, 313AL (AMM 06-42-00).
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