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canaaatr
ctiauencjer
OPERATING MANUAL
PSP 601A-6
SECTION 9
FIRE PROTECTION
TABLE OF CONTENTS
Page
1. GENERAL 1
2. FIRE AND OVERHEAT DETECTION 1
A. Fire Sensing Cables 2
B. Fire and Overheat Detection Units 2
C. Operation 2
D. Fire Warning Circuit Testing 3
E. Engine Jet Pipe/Pylon Overheat Detection System 3
(1) Operation 3
(2) System Testing 3
3. APU AND POWER PLANT FIRE EXTINGUISHING 4
A. APU Fire Extinguishing 4
B. Power Plant Fire Extinguishing 4
C. System Operation 4
D. System Reset 4
LIST OF ILLUSTRATIONS
Figure
Number Title Page
1 Power Plant Fire and Overheat Detection Zones 5
2 Fire Warning and Fault Detection 6
3 Power Plant Zone B Overheat Warning and Fault Detection 7
4 Fire Extinguishing System Discharge Lines - Schematic 8
5 Fire Extinguishing Controls and Firex Monitor Panel 9
6 APU Fire Detection and Extinguishing Sequence 10
7 Power Plant Zone A Fire Detection and Extinguishing Sequence 11
9-CONTENTS
Page 1
Apr 02/87

canadair
ctianencter
OPERATING MANUAL
PSP 60M-6
SECTION 9
FIRE PROTECTION
1. GENERAL
Fire protection, consisting of f i r e detection, warning and extinguishing, is
provided by two independent systems: one for the auxiliary power unit (APU)
and one for the two power plants. Each system includes f i re detection and
extinguishing electrical circuits. The f i re extinguishing agent (Firex)
bottles, two for the power plants and one for the APU, are located in the rear
fuselage equipment bay.
Both systems are capable of detecting false fire warning signals generated by
electrical shorts in the sensing cable circuits. The malfunctioning circuit is
automatically isolated and a warning light in the flight compartment comes on
to indicate a f i r e detection failure.
Titanium firewalls on the engine pylon serve to isolate the power plant fire
zones from the adjacent aircraft structure. The fuel, hydraulic and engine
bleed air lines are all isolated from the power plant f i r e zones by shutoff
valves located on the inboard side of the firewall. The APU is surrounded by a
banadized aluminum enclosure designed to contain an APU f i r e.
A separate system for overheat detection in the engine jet pipe and pylon area
aft of the engine firewall is provided.
2. FIRE AND OVERHEAT DETECTION (Figure 1)
Fire and overheat detection is provided for five detection zones, two for each
power plant and one for the APU. The power plant f i r e zones are: the area
within the core cowling and around the engine combustor section, designated
zone A; and the area around the engine jet pipe and a part of the pylon
assembly behind the firewall, designated zone B. The APU f i r e zone is the area
within the APU fireproof enclosure.
Heat sensing cables are routed through the f i r e zones and are connected to fire
or overheat detection units in the flight compartment. The detection units
discriminate between valid f i r e warnings and system faults and cause either
warning or fault warning lights to come on in the flight compartment.
SECTION 9
Page 1
Apr 02/87
chattenaer
OPERATING MANUAL
PSP 601A-6
Fire Sensing Cables
Each fire sensing cable is a co-axial electrical cable consisting of two
conductors, a stainless steel outer conductor grounded to the airframe and
an inner conductor connected in a closed loop to a detection unit. The two
conductors are separated by a semi-conductor medium which decreases in
electrical resistance as temperature increases. When the resistance of the
semi-conductor decreases to a preset limit, a warning is sent to the flight
compartment via one of the detection units.
A single break in a cable does not impair its warning capabilities but if a
cable is broken in more than one place, any section between breaks will not
function.
The left and right power plants each have four fire sensing cables: two
connected in series and routed through fire zone A, one routed around the
jetpipe in fire zone B and one routed through the pylon in fire zone B.
The APU fire zone contains one cable attached to the APU enclosure walls.
Fire and Overheat Detection Units
Three fire and overheat detection units are installed below the copilot's
side console. Two of the units serve the left and right power plant zone A
detection zones respectively and the remaining unit serves the APU. Two
separate alarm circuits discriminate between valid fire or overheat
warnings and false warnings. The system compares the speed and extent of
sensing cable resistance change and initiates fire and overheat or fault
warnings.
Two fire and overheat detection units, identical to those described above,
serve the left and right power plant zone B detection zones.
Operation (Figures 1 and 2)
When a fire or overheat condition occurs in one of the fire zones, it is
detected by the associated fire or overheat detection unit and interpreted
as either a valid fire warning or as a fault.
If a valid fire warning is received, the detection unit causes the
appropriate fire warning light to come on and activates the fire warning
bell. In addition, if a valid APU fire warning is received, the APU fire
or overheat detection unit initiates a shutdown of the APU. The fire
warning light and the fire warning bell continue to operate as long as a
fire/overheat condition exists. The fire warning bell is silenced via the
TONE MUTED switch/light on the copilots side panel.
If a fire detection unit detects a false warning signal caused by a short
circuit in a sensing cable, it powers the appropriate amber FIRE WARN FAIL
light and automatically isolates the defective fire warning circuit.
SECTION 9
Page 2
Apr 02/87
ctianencjer
OPERATING MANUAL
PSP 601A-6
Fire Warning Circuit Testing
A fire warning test circuit is used to check the serviceability of the fire
detection warning and fault circuits.
This test circuit simulates fire conditions in both power plants and in the
APU. If the fire detection system is functioning correctly, the usual fire
warnings take place.
NOTE: The APU fire shutoff relay is isolated from the fire warning
circuits when a test is initiated. This permits operation of the
APU during testing of the fire warning system.
The fire warning test circuit can also check the operation of the fault
detection circuits in the detection units by simulating a short in each of
the sensing cable circuits. If the fault detection circuits are
functioning correctly, the usual fault warnings take place.
Engine Jet Pipe/Pylon Overheat Detection System (Figure 3)
This system consists of an ENGINE JET PIPE/PYLON panel, two overheat
detection units and fire sensing cables in the zone B detection zones.
(1) Operation
When one of the overheat detection units receives a valid overheat
signal from its associated zone B f i re sensing cable, i t causes the
appropriate OVHT light on the ENGINE JET PIPE/PYLON panel to come on
flashing. The light continues to flash until the overheat condition
is corrected by reducing power or shutting down the engine.
I f an overheat detection unit detects a short circuit in one of the
f i r e sensing cables, the appropriate OVHT WARN FAIL light comes on.
The detection unit also isolates the defective overheat warning
circuit.
(2) System Testing
A test circuit is used to check the serviceability of the system. The
test is successful if the usual overheat warnings take place.
The ability of the system to detect false overheat signals can also be
tested by pressing the OVHT WARN FAIL switch/lights.
SECTION 9
Page 3
Apr 02/87
ctvanenoer
OPERATING MANUAL
PSP 601A-6
3. APU AND POWER PUNT FIRE EXTINGUISHING (Figure 4)
The power plant bottles are interconnected, which allows both bottles to be
used on one power plant if necessary. The APU bottle is completely independent
and discharges into the APU enclosure only. Firex bottle low-pressure warning
lights and test switches for the bottle discharge cartridges (squibs) are
provided (refer to Figure 5).
A. APU Fire Extinguishing (Figure 4)
The APU Firex bottle is clamped to the rear fuselage structure above the
left side of the APU enclosure and charged with Halon 1301. a non-toxic and
non-corrosive fire extinguishing agent* pressurized by dry nitrogen at
600 to 625 psig (at 15°C). The bottle is equipped with a f i l l valve and is
protected against thermal overpressure by a pressure relief valve.
Discharge is made through a pipe into the rear fuselage bay. A pressure
gauge, mounted on the bottle, allows ground service personnel to monitor
the charge pressure. A bottle low-pressure warning is also provided in the
flight compartment.
B. Power Plant Fire Extinguishing (Figure 4)
Two Firex bottles for the power plant fire extinguishing system are bolted
to the APU support structure in the rear fuselage equipment bay. The
bottles are filled with Halon 1301 extinguishing agent pressurized by dry
nitrogen at 600 to 625 psig (at 15°C). Each bottle is equipped with a
pressure relief and f i l l valve and a pressure gauge, similar to the units
on the APU Firex bottle. Two discharge valves are installed on each bottle
to permit interconnection of the discharge lines, making i t possible to
discharge both the bottles into one power plant i f necessary.
The discharge cartridges (squibs) for the power plant Firex bottles are
identical to the APU bottle and operate in a similar manner.
C. System Operation (Figures 4, 5, 6 and 7)
For system operation, refer to the f i re detection and extinguishing
sequence, Figures 6 and 7.
D. System Reset
After a fire warning occurs and the appropriate f i r e warning switch/light
(LH or RH ENG FIRE PUSH or APU FIRE PUSH) is pressed, the fire warning and
extinguishing system can be reset, i f circumstances warrant, by pressing
the f i re warning switch/light a second time which returns the system to the
pre-warning condition. The f i re warning light goes out, the f i re warning
bell stops and the APU or engine previously shut down can be restarted.
Attempting to reset the system with a f i re or overheat condition still
present in the affected fire zone(s) results in the immediate reactivation
of the fire warning.
SECTION 9
Page 4
Apr 02/87
ctianehejer
OPERATING MANUAL
PSP 601A-6
DETECTION ZONE B
(ENGINE JETPIPE/
PYLON OVERHEAT)
CORE
COWL ENGINE FIREWALL
JET PIPE
AFT MOUNT RING
DETECTION ZONE A
Power Plant Fire and Overheat Detection Zones SECTION9
Figure 1 Page 5
Apr 02/87
OPERATING MANUAL
PSP 601A-6
LH ENG, RH &iG AND APU FIRE PUSH SWITCH/LIGHTS
Each switch/light is electrically connected to a fire and overheat
detection unit.
Red LH BIG, RH ENG or APU FIRE PUSH lights come on if a
valid fire warning is received by the associated fire and overheat
detection unit.
When pressed in. switch/lights shut down power plants or APU
and arm assocaited BOTTLE ARMED PUSH TO DiSCH iightis)
(refer to Figure 5). For system operation, refer to Figure 6 and 7.
LH ENG
FIRE
PUSH
RH ENG
FIRE
PUSH
GLARESHIELD
FIRE WARNING TEST
LEFT APU RIGHT
FIRE
WARN
FAIL
FIRE
WARN
FAIL
FIRE
WARN
FAIL
FIRE WARNING TEST SWITCH
Three-position, spring-loaded toggle switch with the following
functions:
WARN TEST - Simulates fire condition by grounding the fire
sensing cables. Fire warning befl sounds and at) the FIRE PUSH
and the BOTTLE ARMED PUSH TO DISCH lights come on.
FAULT TEST - Simulates an electrical short in the fire sensing
cables. All three FIRE WARN FAIL lights come on.
FIRE WARN FAIL LIGHTS
Amber FIRE WARN FAIL fights come on if a false warning,
generated by an electrical short in a sensing cable circuit, is
received by the associated fire and overheat detection unit. Light
remains on and faulty detection circuit remains isolated from
system until fault is corrected.
COPILOTS CONSOLE
Fire Warning and Fault Detection SECTION9
Figure 2 Page 6
Apr 02/87
ctiauenc/er
OPERATING MANUAL
PSP 601A-6
OVHT WARN FAIL SWITCH/LIGHTS
Amber lights come on if an overheat warning,
generated by an electrical short, in a zone B
sensing cable circuit, is received by associated
overheat detection unit. Lights remain on and faulty
detection circuit remains isolated from system until
fault is corrected.
Pressing lights test overheat detection circuits.
Correct operation of system is indicated by OVHT
WARN FAIL lights coming on.
OVHT SWITCH/LIGHTS
Each switch/light is electrically connected to a zone
B overheat detection unit.
Red left and right OVHT lights come on flashing if
a valid 2one B overheat warning is received by the
associated overheat detection unit.
Pressing lights test functioning of warning circuit
and sensing cable continuity. Correct operation of
system is indicated by OVHT lights coming on.
CENTRE INSTRUMENT PANEL
Power Plant Zone B Overheat Warning and SECTION 9
Fault Detection Page 7
Figure 3 Apr 02/87
RIGHT POWER PLANT
DISCHARGE NOZZLES
OPERATING MANUAL
PSP601A-6
APU
APU
'FIREX
BOTTLE
RIGHT POWER
PLANT
DISCHARGE
UNE
FIREX BOTTLES
A N D
DISCHARGE LINES
LEFT POWER PLANT
DISCHARGE NOZZLES
LEFT POWER PLANT
DISCHARGE LINE
POWER PLANT LEFT
RREX BOTTLES " - M I I I NG
LEFT POWER PLANT HREZONE A REAR FUSELAGE EQUIPMENT BAY
POWER
PLANT
RREX
BOTTLE
2
DISCHARGE
NOZZLE
LEFT
TWO-WAY
CHECK VALVE
RIGHT
TWO-WAY
CHECK VALVE
. THERMAL RELIEF
DISCHARGE UNE
APU FIREX
BOTTLE
DISCHARGE
CARTRIDGE
(TYPICAL)
\ APU ENCLOSURE
TO
RIGHT
ENGINE
Fire Extinguishing System Discharge Lines - Schematic
Figure 4
SECTION 9
Page 8
Apr 02/87
OPERATING MANUAL
PSP 601A-6
BOTTLE 2
ARMED
PUSH TO
DISCH
BOTTLE 1 AND BOTTLE 2 ARMED PUSH TO DISCH SWITCH/LIGHTS
When the appropriate LH or RH ENG FIRE PUSH switch/light is pressed in after a
power plant fire warning. BOTTLE 1 and BOTTLE 2 ARMED PUSH TO DISCH lights
come on if pressure is associated firex bottles exceeds 225 to 275 psi.
After LH ENG FIRE PUSH switch/light is pressed in. pressing either BOTTLE ARMED
PUSH TO DISCH switch/light fires the left squib on the associated Firex bottle, i.e.
pressing the BOTTLE 1 ARMED PUSH TO DISCH switch/tight fires left squib on Firex
bottle 1 and pressing BOTTLE 2 ARMED PUSH TO DISCH switch/light fires left squib
on Firex bottle 2. Right squibs are fired in a similar manner rf RH EM6 FIRE PUSH
switch/light is pressed in response to a fire condition in the right power plant.
APU BOTTLE ARMED PUSH TO DISCH SWITCH/LIGHT
Following an APU fire warning, and after the APU FIRE PUSH
switch/light has been pressed in. the green BOTTLE ARMED
PUSH TO DISCH light comes on if pressure in APU Firex bottle
exceeds 225 to 275 psi. Pressing switch/light m fires squib on
APU Firex bottle.
GLARESHIELD
PRESS TO TEST SQUIB SWITCH/LIGHTS
When pressed in. test electrical continuity of ignition circuits to both the ignition
elements inside the associated squib. Green light comes on if ignition circuit is
servicabie. Test current across ignition element is maintained at safe level by
switch/light circuit.
BOTTLE LOW PRESS LIGHTS
Energized by circuits across electrical pressure switches integral with bottle-mounted
pressure gauges. Amber LOW PRESS light comes on when associated bottle pressure
drops below 275 to 225 psi and remains on until pressure increases to above 450 psi.
COPILOTS CONSOLE
Fire Extinguishing Controls and Firex Monitor Panel SECTION 9
Figure 5 Page 9
Apr 02/87
OPERATING MANUAL
PSP 601A-6
FLIGHT COMPARTMENT INDICATIONS
CO
CO
O
—J
BOTTLE
ARMED
PUSH TO
DISCH
APU
FIRE
PUSH
EVENT RESULT
L
OUT
OUT
OUT
ON
until APU bottle
Is recharged I
5 5 5 §
- APU FIRE PUSH light comes on.
- If aircraft Is on the ground, the APU
fire shutoff relay Is automatically
energlied to shut down the APU.
- BOTTLE ARMED PUSH TO OISCH
light comes on.
- If airborne, APU fire shutoff relay
Is energlied to shut down the APU.
- APU squib Is armed.
• APU bleed air load control valve closes.
- APU fuel shutoff valvea close.
- APU squib fires.
• FlreN egent starts discharging Into APU
enclosure.
-Pressure switch on bottle opens as
pressure drops below 225 to 278 psl end
APU LO PRESS light on Flrex monitor
panel comes on.
- APU fire goes out.
Fire or overheat condition occurs
In the APU fire tone.
APU FIRE PUSH switch/light Is 1
pressed in. j
BOTTLE ARMED PUSH TO OISCH
switch/light Is pressed In.
APU bottle fully discharges.
v CM CO ^ 1
APU Fire Detection and Extinguishing Sequence
Figure 6
SECTION 9
Page 10
Apr 02/87
canaaair
cftauenQer
OPERATING MANUAL
PSP 601A-6
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Power Plant Zone A Fire Detection and
Extinguishing Sequence
Figure 7
SECTION 9
Page n
Apr 02/87

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MANUAL 8 MANUAL 8 MANUAL 8 MANUAL 8 MANUAL 8 MANUAL 8

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好好学习

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