Book 3 - Fire Detection and Protection Flashcards
fire detectors must be fitted in the designated ____ zones of all power plants, except those of low-powered piston engined aircraft with a maximum authorised weight of 12,500lb or ____
fire detectors must be fitted in the designated FIRE zones of all power plants, except those of low-powered piston engined aircraft with a maximum authorised weight of 12,500lb or LESS
a designated fire ____ is a region where a potential fire risk may exist following a failure, or leakage, of any component, equipment or part of the power plant
a designated fire ZONE is a region where a potential fire risk may exist following a failure, or leakage, of any component, equipment or part of the power plant
detection systems must be capable of providing rapid ________ of a localised fire or overeat and identification of the ____ in which some corrective action is required
detection must ___ automatically operate main power unit extinguishers
detection systems must be capable of providing rapid DETECTION of a localised fire or overeat and identification of the AREA in which some corrective action is required
detection must NOT automatically operate main power unit extinguishers
the main power plant fire detection system should contain an ______ warning device to supplement the visual indications
the main power plant fire detection system should contain an AUDIBLE warning device to supplement the visual indications
there are two types of detectors:
- unit - suitable for _______, known as _____ detectors
- continuous - suitable for ____ detection
there are two types of detectors:
- unit - suitable for OVERHEAT, known as POINT detectors
- continuous - suitable for FIRE detection
thermal expansion switches are point detectors
in the event of a sufficient temperature rise (typically 300 celsius), the steel case expands, allowing the contacts to _____ and complete the circuit
thermal expansion switches are point detectors
in the event of a sufficient temperature rise (typically 300 celsius), the steel case expands, allowing the contacts to CLOSE and complete the circuit
differential expansion switches are point detectors
operates on the principle of __________ linear expansion of different metals, usually invar and steel
during slow temp rise, both metallic strips expand at same rate. once threshold is hit, however, one contacts the threshold stop whilst the other carries on, separating the contacts
during fast temp rise, insulation prevents one strip from expanding whilst bare strip expands and contacts separate and warning is generated
differential expansion switches are point detectors
operates on the principle of DIFFERENTIAL linear expansion of different metals, usually invar and steel
during slow temp rise, both metallic strips expand at same rate. once threshold is hit, however, one contacts the threshold stop whilst the other carries on, separating the contacts
during fast temp rise, insulation prevents one strip from expanding whilst bare strip expands and contacts separate and warning is generated
fusible link switches are point detectors
fusible (melting) link holds contacts off, when predetermined temperature is met, link melts and spring pressure causes plunger to rise and make contacts
___ use only
fusible link switches are point detectors
fusible (melting) link holds contacts off, when predetermined temperature is met, link melts and spring pressure causes plunger to rise and make contacts
___ use only
pyrotechnic flame switch is a point detector
contains pyrotechnic chord in capillary tube housing. pyrotechnic chord ______ takes place in high temperatures, increasing pressure in tube and operating switch mechanism
not used on commercial aircraft
pyrotechnic flame switch is a point detector
contains pyrotechnic chord in capillary tube housing. pyrotechnic chord IGNITION takes place in high temperatures, increasing pressure in tube and operating switch mechanism
not used on commercial aircraft
there are two types of thermocouple detectors:
- standard thermocouple - point detectors, control box sends signal when temp reaches pre-determined level. may also give temperature indication on ______
- continuous thermocouple - allows for an _______ number of measuring points along the sensors length
there are two types of thermocouple detectors:
- standard thermocouple - point detectors, control box sends signal when temp reaches pre-determined level. may also give temperature indication on GAUGE
- continuous thermocouple - allows for an INFINITE number of measuring points along the sensors length
firewire detection systems can be split into two types:
- continuous loop
- continuous length
a continuous loop unit has, as the name indicates, a loop of wire going from, and returning to, the ______ unit. they are further split into ________ and capacitative types
the continuous length types have a wire which extends from the control unit and _________ in a dead end. they are further split into _________ and liquid detectors
firewire detection systems can be split into two types:
- continuous loop
- continuous length
a continuous loop unit has, as the name indicates, a loop of wire going from, and returning to, the CONTROL unit. they are further split into RESISTIVE and capacitative types
the continuous length types have a wire which extends from the control unit and TERMINATES in a dead end. they are further split into PNEUMATIC and liquid detectors
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