Fire Detection and Protection

Question 1

Type of ice

Answer 1

• Hoar Frost
• Rime Ice
• Clear or Glaze Ice

Question 2

effect

Answer 2

stall speed increase
performance reduce
surface restricted
block instrument and give error value

Question 3

counter effect for engine

Answer 3

de-icing - remove ice present in flight or in the ground

anti-icing avoid the creation of ice

Question 4

type of counter-effect

Answer 4

Hot bleed air
Hot engine oil
Elecrically heated
pneumatically operated
fluid de-icing

Question 5

the position

Answer 5

wing leading edges
tail surface
windscreen
engine and intake inlets
propeller
pitot static-  flight instr probes
warning light

Question 6

Ice detector type

Answer 6

the ice detector head. (Accretion principle)
• the mechanical ice detector. (Accretion principle )
• the element ice sensing unit. (Inferential principle)

Question 7

ice detector head

Answer 7

• Teddington consists of an aerofoil shaped mast rotruding into the airflow and visible from the cockpit heater element and a light to illuminate the mast at night
• Smiths consists of a hollow tube, attached to the aircraft has holes drilled in the leading 4 and 2 trailing faces, it feel the pressure in case of ice there is a differen pressure

Question 8

mechanical ice detector

Answer 8

Rotary a serrated rotor shaft is continuously driven by an electric motor, in case of ice the torque is greater
Rosemount consists of a short cylindrical probe mounted on a vibrator housing 35 kHz If ice is on the probe, the + mass reduces the resonant frequencies

Question 9

Eleme ice weston detector

Answer 9

Moisture Detector Controller.
The Sangamo Weston Ice Detector
is situated in the base of the unit and senses the T difference between the “wet” and “dry” sensing bulbs. When the T difference reaches a predetermined value a switch is activated

Beta Particle Ice Detection Probe
Two probes, mounted perpendicularly from the forward uselage, plus a warning constitute the basic system.
Under nil ice conditions the forward probe, an emitter, will emit Beta particles which are detected by the rear probe, ice absorb Beta particles so in icing conditions, less particles are sensed by the detector.

Ice Formation Spot Light. Many aircraft have two ice formation spot lights mounted one each side of the fuselage, in such a position as to light up the leading edges of the mainplanes, when required, to allow visual examination for ice formatio