(b)
The appropriate overheat caution message - L or R ENG OVHT, is displayed on EICAS (P2).
(c)
The amber master caution lights, on glareshield panels P7, come on.
(d)
The caution annunciation tone sounds, on the flight deck aural warning speakers.
(5)
A dual-loop failure indication is given by the following:
(a)
The amber FAIL P-RESET switchlight, on the P8 control stand, comes on.
(b)
The advisory message, FIRE/OVHT SYS, is displayed on EICAS (P2).
(c)
The appropriate system status/maintenance messages are displayed on EICAS: 1) L STRUT OH DET 1 and 2 2) R STRUT OH DET 1 and 2
(6)
The FAIL P-RESET switchlight is pressed to reset the fail light circuitry of the failed system. This also turns off the FAIL P-RESET switchlight, and clears the EICAS advisory message -FIRE/OVHT SYS.
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MAINTENANCE MANUAL
(7) A single-loop failure indication is given by the following:
(a) The appropriate status/maintenance message is displayed on
EICAS (P2):
1) L STRUT OH DET 1 and 2
2) R STRUT OH DET 1 and 2
(8) A single loop alarm signal indication is given by the following:
(a) The appropriate amber engine overheat light - L or R ENG OVHT,
on the P8 control stand, comes on.
(b) The appropriate overheat caution message - L or R ENG OVHT, is
displayed on EICAS (P2).
(c) The amber master caution lights, on glareshield panels P7, come
on.
(d) The owl caution annunciation tone sounds, on the flight deck
aural warning speakers.
(9) Detector, card, or associated wiring failures may not provide a
failure indication at the moment of failure. These inoperative
loops can only be detected during a system test.
B. Test____
(1) When a test occurs, the AFOLTS cards send out signals to each loop
of the detection systems. Returned signals indicate operating
loops. If any loop is found faulty, AFOLTS reconfigures that system
to operate on the remaining loop. If the remaining loop sustains an
alarm condition, then an overheat warning indication results.
(2) Power-up mode:
(a) Whenever power is first applied, an automatic system self-test
occurs. All loop status/maintenance messages are momentarily
displayed on EICAS (P2). If any loop is found failed, then the
appropriate loop message remains on EICAS display, and the
system is reconfigured to the other loop. If both loops of a
system are found failed, then the FAIL P-RESET switchlight (on
P8) comes on, and EICAS displays the advisory message -
FIRE/OVHT SYS. Cockpit overheat warnings will not be initiated
by a power-up test.
(3) Manual system test:
(a) When the ENG switch on the fire/overheat test panel (on P8) is
pressed and held, the strut overheat and engine turbine cooling
overheat detection systems go through a self-test. All loop
messages are displayed on EICAS. Loop messages will disappear
from the status page during fire/overheat output, but will
remain on maintenance page. After a two to four second delay,
a successful test terminates with all fire and overheat
indications. The engine indications are:
1) The red L and R fire switch handles light up, and unlock
(on P8).
2) The red L and R fuel control switches light up (on P10).
3) The red FIRE light comes on (on P1-3).
4) The amber L and R ENG OVHT lights come on (on P8).
5) EICAS displays L and R ENGINE FIRE (warnings), and L and R
ENG OVHT (cautions).
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