Book 3 - Fire Detection and Protection Flashcards Preview

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Flashcards in Book 3 - Fire Detection and Protection Deck (12)
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1
Q

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 ____

A

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

2
Q

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

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

3
Q

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

A

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

4
Q

the main power plant fire detection system should contain an ______ warning device to supplement the visual indications

A

the main power plant fire detection system should contain an AUDIBLE warning device to supplement the visual indications

5
Q

there are two types of detectors:

  • unit - suitable for _______, known as _____ detectors
  • continuous - suitable for ____ detection
A

there are two types of detectors:

  • unit - suitable for OVERHEAT, known as POINT detectors
  • continuous - suitable for FIRE detection
6
Q

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

A

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

7
Q

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

A

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

8
Q

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

A

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

9
Q

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

A

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

10
Q

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
A

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
11
Q

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

A

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

12
Q

PAGE 95

A

PAGE 95