O & P Airframe

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O & P Airframe
2014-02-06 16:31:10
O & P Airframe
O & P Airframe
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  1. What wood other than solid are used
    laminated and ply
  2. what is a laminated wood assembly
    two or more layers, with parallel grain
  3. aircraft ply construction
    odd ply grain @ 45 degrees or 90 degrees
  4. primary wood species
    Sitka spruce
  5. how do you inspect for rot?
    discoloration and grey stains along grain
  6. what types of glue
    • casein and resin
    • *note - glue joint to be under pressure for 7 hours
  7. what effects do temp have on glue
    cure time and joint strength
  8. are mineral streaks OK
    if no rot is present
  9. are knots ok
    yes, within specfications
  10. why is compressed wood NOT ok
    serious loss of strength
  11. why is it necessary to inspect stains
    determine level of decay
  12. why are bushings used in wood
    prevent crushing the wood grain
  13. results of low glue pressure
    thick and weak joint
  14. pressure methods
    • brads
    • nails
    • screws
    • clamps
    • pressure
  15. type of joint used in structural wood
    • scarf
    • *note - scarf cut is 12 to 1
  16. Why does the strength of a beveled scarf depend on the accuracy of cut?
    Glue area is reduced if bevels are not the same.
  17. Always splice and reinforce plywood with?
    Same type plywood.
  18. Types of fabric are?
    • Organic
    • Sythetic
    • Fiberglass
  19. Organic fabrics are?
    • Cotton
    • Linen
  20. Synthetic fibers are?
    • Fiberglass
    • Heat shrinkable synthetic (nylon, orlon, dacron)
  21. What determines the quality of fabric and strength requirements?
    • VNE
    • loading
  22. What strength should be used in recovering?
    Equal in quality and strength.
  23. Warp?
    Direction along the length.
  24. Purpose of reinforcing tape?
    Prevent stitching cord from cutting fabric.
  25. Types of machine-sewn seams are?
    • French-fell
    • Folded-fell
    • Plain overlap
  26. What structure prep for doped fabric?
    Dope proof with paint or tape.
  27. Where is surface tape used?
    • Sewed seams
    • lapped edges
    • ribbed stitching
    • screws
  28. What is the advantage of the envelope method of covering?
    Most sewing is done by machines.
  29. Where are anti-tear strips recommended?
    VNE of more than 250 MPH
  30. How are vent and drain holes reinforced?
    Plastic, aluminum, or brass grommets
  31. How do you test fabric?
    Punch test or lab test if results are marginal
  32. Max deterioration?
  33. Type of fabric not affected by moisture or mildew is?
  34. What is the Selvage edge for?
    Edge woven to prevent raveling
  35. What rib lacing spacing is used when original is not known?
    Chart AC 43.13 1B
  36. Tie off knot
    Modified seine used on all but starting the stitch.
  37. In which direction is the warp and selvage applied?
    Parallel to flight TSO # on selvage edge.
  38. Common types are?
    • Primers
    • enamels
    • laquers
    • epoxies
  39. Thin zinc chromate with?
  40. Types of dope?
    • Nitrate
    • Butyrate
  41. Why not use dope over paint or enamel
    Tends to soften
  42. Too much drier?
    Thin and brittle film causing cracking and peeling.
  43. Purpose of zinc chromate?
    Corrosion resistance and base for paint.
  44. Advantage of butyrate?
    Less flammable.
  45. Safety using solvents
    Wear a respirator.
  46. Methods of application
    • Dipping
    • brushing
    • spraying
  47. What system is compatible with epoxy top coats?
    Any in good condition.
  48. Cause for dust (cover spray)?
    Pressure and distance.
  49. Sags and runs?
    Too much paint and bad prep.
  50. Orange peel?
    Viscosity, gun setting, air, and distance.
  51. Blushing?
    Clouding or blooming of the film
  52. Cause of blushing?
    Moisture in air supply, adverse humidity, temp up and down.
  53. Too high temperature when applying dope causes?
  54. What areas must be protected during stripping?
    • Synthetic rubber
    • Composites
    • Fabric
    • Acrylics
    • Bonded surfaces
  55. Purpose for touch ups is to?
    Prevent corrosion
  56. Control surface balance after paint?
    Service manual.
  57. Marking regs?
    Part 45
  58. What is done with the stem of a friction lock rivet?
    Trimmed flush with head.
  59. Example of self-plugging rivet
    Cherry lock, cherrymax, or Huck.
  60. Tool to install Cherrylock?
    Hand or air puller.
  61. Proper rivet shop head?
    Width = 1 1/2 diameter of rivet shank / height = 1/2 of diameter of rivet shank
  62. What is bonded with honeycomb construction?
    Laminar (two metal sides bonded to honeycomb)
  63. Materials used in bonded honeycomb?
    • Stainless
    • Titanium
    • Magnesium
    • Plywood
    • Glass
    • Nylon and cotton cloth (Jep 3-34)
    • Aluminum
    • Kevlar
    • Carbon
    • Steel
    • Paper
  64. What causes the delaminating of honeycomb?
    • Sonic vibe
    • Liquid
    • Internal condensation
    • Manual flaw
  65. What is potting compound used for?
    Fill holes in honeycomb (NOTE: 1" Max)
  66. What is done with the damaged area of honeycomb?
    It must be removed.
  67. What causes crazing?
    • Stress
    • Improper handling
    • Harmful solvents.
  68. How do you drill plex?
    Back up with wood, feed drill slowly.
  69. What should be done to twist drills used to drill plex?
    • 60° tip angle
    • Zero rake on cutting edge
    • Back lip angle increased to 12° to 15°

    NOTE: ASA says 140°
  70. Calculations made when bending sheet metal?
    Bend allowance and set back.
  71. What must be done where two bends intersect?
    Relief holes drilled.
  72. What type of weathering damage may be found on aluminum aircraft?
  73. Methods of forming sheet metal are?
    • Shrinking
    • Stretching
    • Bumping
    • Crimpling
    • Folding
  74. Factors of setback are?
    Bend radius and thickness
  75. Purpose of lightning holes is to?
    Reduce weight.
  76. What is a joggle?
    Offset formed to allow for clearance.
  77. Total length of a rivet installation is?
    Grip length and 1 1/2 times shank diameter.
  78. Proper material in repair is?
    Same as original.
  79. Single row spacing and ED edge (distance) of protruding heads is?
    • ED is 2d
    • Spacing is 3d
  80. Describe rivet head markings.
    • 1100 plain
    • 2017 raised dot
    • 2024 raised double dash
    • 2117 recessed dot
    • 5056 raised cross
    • 7075 three raised dashes
  81. Types of alloys are?
    • 1xx Alum
    • 2xx Copper
    • 3xx Manganese
    • 4xx Silicon
    • 5xx Magnesium
    • 6xx Magnesium & Silicon
    • 7xx Zinc
    • 8xx other
    • 9xx unused series
  82. Dimpling vs. countersink?
    Determined by material thickness
  83. Most common rivet failure is?
    Shear loading
  84. REplace a 2024 with 2117
    • For 5/32 or use next larger size of 2117
    • NOTES: Bolts with a triangle is close tolerance, Dash is a corrosion resistant bolt.
  85. Preferred method for welding magnesium
    Gas shielded arc
  86. Safety hazard with magnesium
    If ignited, hard to extinguish
  87. Why is flux needed for silver soldering?
    Chemically clean base metal
  88. Type of flame for silver solder is?
  89. Dented tube at a cluster?
    Formed steel patch
  90. Insert tight sleeve into tube
    Dry ice
  91. What are three types of welding
    • Gas
    • Arc
    • Resistance
  92. How do you get a soft flame and not lose heat
    Larger tip size and adjust pressure
  93. What is common method for welding aluminum
    Gas shielded arc
  94. Which valve should be turned off first
  95. how control expansion
    tack weld along joint
  96. precaution when completed
    turn off valves, relieve all pressure
  97. aluminum alloy heat treated parts after welding
  98. insufficient penetration in welding causes what
    weak welds
  99. type of welding that causes less buckling and warping than gas
    Metallic arc
  100. Gas shielded arc welding, also known as Shielded Metal Arc Welding (SMAW), Manual Metal Arc (MMA) Welding, Flux-shielded Arc Welding, or informally as stick welding
    • arc welding process that uses a consumable electrode coated in flux to lay the weld.
    • An electric current in the form of either alternating current or direct current from a welding power supply is used to form an electric arc between the electrode and the metals to be joined.
    • As the weld is laid, the flux coating of the electrode disintegrates giving off vapors that serve as a shielding gas and providing a layer of slag, both of which serve to protect the weld area from atmospheric contamination.
  101. advantages of gas shield arc welding
    stronger, more ductile, corrosion resistant
  102. size of torch tip determines
    • amount of heat not temp
    • *note - flame for aluminum is soft and neutral
    • **note - flame for stainless steel slightly carburizing
  103. Servo trim tab
    auxiliary control aids pilot in movement of control surfaces
  104. balance trim tab
    auxiliary control aids in movement of primary control surfaces by keeping a direct proportion of deflection to the aerodynamic load imposed on the surface.
  105. 4 high lift devices
    • leading edge flaps
    • slots
    • slats
    • flaps
  106. 3 mechanical methods to move flight controls
    • cable
    • push pull
    • torque tube
  107. the cyclic pitch purpose is
    changes pitch of each main rotor blade
  108. collective does what
    varies lift simultaneously
  109. compensates for torque
    tail rotor
  110. controls tail rotor
    foot pedals
  111. primary flight controls are
    • ailerons
    • rudder
    • elevators
  112. secondary flight controls are
    • trim tabs
    • spring tabs
  113. auxiliary flight controls
    • flaps
    • spoilers
    • speed brakes
    • slots
  114. axes of flight are
    • longitudinal
    • lateral
    • vertical
  115. where do cables break most
    • over pulleys
    • through fairleads
  116. what must be known before using a rigging chart
    • cable size
    • outside temperature
  117. cable tension regulators do what
    maintain tension
  118. failed
    cable guide
  119. vortex generators are
    • boundary layer air control
    • pulls high energy air down to prevent airflow from separating from the airfoil
  120. why lock control surfaces
    prevent damage
  121. primary tools used to check travel
    • protractors
    • rigging fixtures
    • contour templates
    • rulers
  122. A&P signoff on
    100 hour inspections
  123. when may a mechanic perform an annual inspection
    when he/she becomes and IA
  124. When is an Annual due
    12 calendar months
  125. a checklist for 100 hour
    any checklist that meets or exceeds 43 appendix D.
  126. Record entry info after 100 hour (FAR)?
  127. Who may supervise a progressive inspection?
    • A&P
    • IA
    • Certified repair station
    • Aircraft manufacturer
  128. When must a part 91 aircraft use 100 hour?
    When used for hire and/or flight training.
  129. When is the first 100 due after discontinuance of progressive?
    100 hours after last complete inspection of the progressive.
  130. Does a progressive plane need a 100 hour if used for hire?
  131. A&P limits on props?
    No major repairs.
  132. Out of annual aircraft flight, what must you do?
    Permit, ferry permit, or special airworthiness certificate
  133. Rating needed for complete 100 hour
  134. FAR that requires 100 hour inspection is?
    Part 91 409b
  135. Log book entries for 100 hour?
  136. What is the necessary info on electrical system?
    Manufacturers manual.
  137. Who must approve radios installed with an STC (supplemental Type Certificate)?
  138. Can you overfly 100 hour?
    Yes, not more than 10 hours.
  139. If 100 hours overflown?
    102 next due 98.
  140. Where do you get an approval for progressive inspection?
    FSDO (Flight Standar District Office)
  141. Is a turbine run up due on 100 hour?
  142. What is used to inflate strut?
    Dry air or nitrogen
  143. What is done a regular inspection of a strut?
    • Inspect for cleanliness
    • Evidence of damage
    • Check for proper extension
  144. Purpose of torque links are to
    Keep gear pointed straight
  145. Power sources used for retraction are
    Hydraulic and electric (9-14)
  146. Steering type on small aircraft
    Mechanical links from pedals (9-11)
  147. What prevents nose wheel vibration?
    Shimming dampener
  148. Types of brake systems are
    • Independent
    • power boose
    • power control
    • (9-25)
  149. Purpose of de-booster cylinders are
    Reduce pressure and increase volume (9-25)
  150. What do you do before brake inspections?
    Pressurize systems
  151. What prevents a split wheel from leaking?
    O-ring seal (9-6)
  152. Most important function fore tire life is what?
    Proper inflation
  153. Effects of under-inflation?
    Rapid or uneven wear/creep or slip during braking
  154. When should gear retraction be performed
    Annual, component replacement, hard landings
  155. Indication of excessive heat on bearing is?
    discoloration (9-8)
  156. Purpose of anti-skid is?
    Stop without skidding
  157. Purpose of fusible plug is?
    Relieve pressure and prevent blow out (9-10)
  158. Methods of brake bleeding
    • Gravity
    • Pressure
    • (9-32)
  159. Methods for transmitting control movements in large aircraft?
    • Mechanical
    • Electrical
    • Hydraulic
    • (9-11)
  160. Nose wheel centerings cans or external track?
    Keep wheels in line when retracting into hub
  161. Types of hydraulic fluid are (8-7)
    • Vegetable
    • Mineral (petroleum)
    • Phosphate ester (Skydrol)
  162. Mineral color is
    • Red (8-7)
    • Vegetable 7644 blue
    • phosphate ester (skydrol) light purple
  163. Skydrol (phosphate ester) can?
    Soften, damage, or peel vinyl, enamel, lacquer, oil base paints
  164. Feature in pumps to prevent damage in case of seizure?
    Shear section in shaft
  165. How to minimize contamination during component change?
    Cap lines
  166. What could cause a filter to bypass
    • Clogged
    • NOTE: FAA rule filter must bypass if it becomes clogged.
  167. Power sources of hydraulic pressure in aircraft are?
    • Hand pumps
    • Engine driven pumps
    • Electrically driven pumps
    • (8-12)
  168. Methods of pressurization on reservoirs are?
    • Cabin pressurization
    • turbine
    • aspiration
    • venturi tee
    • (8-16)
  169. How does a gear type pump operate
    A 2 gear type pump driven by engine by upper gear with splined shaft. Fluid is trapped by gear teeth and pump wall at 15 PSI
  170. Two types of engine drive pumps are
    • Constant delivery (8-23)
    • Variable delivery (8-25)
  171. Purpose of a pressure regulator is to
    Maintain pressure and unload pump (8-25)
  172. Purpose of pressure relief valve is to
    Limit pressure and prevent damage
  173. What is used to supplement pumps?
  174. Different types of accumulators?
    • Diaphragm
    • Bladder
    • Piston
  175. Purpose for pneumatic systems (drives) is?
    • Brakes
    • doors
    • drive pumps
    • starting
  176. Sources of pneumatic power are
    • bottles
    • vane preens
    • turbine compressors
  177. What happens if excessive pressure builds up in a pneumatic system?
    Relief valve bleeds air to atmosphere
  178. Restrictors do what?
    Control air flow.
  179. Why purge pneumatics?
    Remove moisture and contamination
  180. What steps to do before disassembling accumulators?
    MUST dump pre-load air pressure!
  181. Two groups of independent cabin compressors are
    • positive displacements
    • centrifugal
  182. Principal control of pressure systems is
    Outflow valve
  183. Method used by some turbines
    Bleed air
  184. Roots blower is
    engine driven compressor
  185. what controller will change the position of the outflow valve?
    cabin pressure controller
  186. methods of providing heat on reciprocating aircraft
    • gas combustion heater
    • electric
    • exhaust gas air to air heat exchanger
  187. function of ventilating air in combustion heater
    more heat where needed
  188. what are the sources of ventilating air in combustion heater
    • blower
    • ram air
    • cabin compressor
  189. components of air cycle cooling system
    • expansion turbine
    • air to air heat exhangers
    • various valves
  190. what causes the temp drop in air cycle
    expansion turbine. air does work and undergoes a pressure and temperature drop.
  191. how does a water separator work
    vanes swirl the air and water is collected
  192. vapor cycle is?
    freon cooling
  193. components of vapor cycle are?
    • evaporator
    • compressor
    • condenser
    • expansion valves (fig 14-36)
  194. how does continuous flow oxygen work
    oxygen flows fro a cylinder through a line to reducing valve and to mask outlets
  195. how does the pressure demand systems work
    oxygen flows from cylinder to pressure regulator and each member adjusts as needed.
  196. if system is open two or more hours?
    must be purged to remove moisture
  197. used to purge
    • dry nitrogen
    • air
    • O2 (oxygen)
  198. type of O2 (oxygen) used?
    aviators breathing oxygen
  199. why is oil added to vapor cycle systems
    provide lube for compressor
  200. safety handling O2 is?
    oil free tools, clothing, hands, and wear eye protection
  201. reference for range markings come from where?
    TCDS, flight manual
  202. yellow arc means what?
  203. markings on dial face
    instrument repair station
  204. slippage marks are for what purpose?
    loose glass
  205. installing range markings?
    slippage mark is white
  206. how could you check MAP gauge?
    current atmospheric pressure
  207. what instrument may be used to check MAP gauge?
    sensitive altimeter
  208. what indication errors may be found in altimeters?
    • scale
    • hyseresis
    • installation
  209. instruments connected to pilot-static system
    • VSI
    • airspeed
    • altimeter
  210. why not clear obstructions from static holes with a tool?
    holes are critical aerodynamically
  211. what is required after components are replaced in pilot-static system
    leak test
  212. turn and bank indicators driven by
    • vacuum
    • air pressure
    • electricity
  213. what causes an electric driven gyro rotor to tilt when the aircraft turns?
    gyro precession
  214. what is a synchronous type remote indicating system
    transfers unit's information from one point to another.
  215. What does a capacitor type fuel quantity system accurately determine?
    weight of fuel
  216. tachometer indicates?
    crank shaft or main turbine speed
  217. where does an electrical resistance temperature indicator receive a signal?
    temperature sensitive element or bulb
  218. turbine exhaust gas temperature sensing system uses a
    thermocouple type system
  219. swinging a compass
    correcting for deviations by adjusting magnets
  220. items looked for during compass inspection
    • security
    • readings
    • filled
    • readable
  221. what effects to magnetic fields generated by operating electrical equipment or metal components have on a compass?
    • deflect needle from magnetic course
    • NOTE: pitot static includes airspeed indicator, altimeter, & VSI or vertical speed indicator
  222. three auto pilot components are
    • gyro
    • servo
    • amplifier
  223. sensing elements
    • DG
    • turn and bank gyro
    • altitude gyro
    • altitude control
  224. activating elements
    servos that operate the system
  225. basic components of communication system are
    • microphone
    • transmitter
    • antenna
    • receiver
    • headset or speaker
  226. most common com is
  227. transponder cert when?
    24 months
  228. VOR system consists of?
    • receiver
    • visibility indicator
    • frequency selector
    • antennas
    • power supply
  229. two antennas or multi element for ILS are
    • localizer
    • glideslope
  230. glide slope beam
    • vertical guidance
    • correct angle of descent
  231. what is DME
    distance measuring equipment
  232. what do you use VOR for?
  233. where should DME antenna be located?
    bottom of aircraft not blanked out by the wing
  234. ADF means?
    automatic direction finder
  235. transponder atennas are
    shot strike usually on a lower surface
  236. what powers an ELT
    self contained battery
  237. how to do an ELT test
    tune to 121.5 (civilian) on VHF
  238. when do you replace ELT batteries?
    date for replacement or recharging is on ELT and book; aircraft maintenance
  239. coax cable routing is done how?
    • secured every two feet
    • not routed with other wire
    • bends are 10 times wire diameter
  240. purpose of shock mounting bonding jumper is
    low-impedance ground return
  241. when should you check ELT
    within five minutes if not coordinate with FAA after 1 hour or 2.
  242. purpose of a dump system
  243. when would a jettison system be required on a small aircraft?
    takeoff weight is higher than landing weight
  244. why 2 _______ independent systems for each wing?
  245. two types of fuel cells
    • bladder
    • integral
  246. what supports the weight of the fuel in the bladder
    structure of the cavity
  247. wet wing means what
    integral type fuel tank
  248. purpose of temp indicator in turbine fuel cells is to
    determine danger of ice crystals
  249. purpose of cross feed system is
    fuel can be fed from various tanks to any engine
  250. positions on fuel selector valve are
    • cross feed
    • transfer
    • on
    • off
  251. drip gauges and sight gauges
    • under wing
    • bayonette type gauges
  252. shut off valve transit light indicate
    when valve is in motion
  253. pressure fueling AKAS is
    under wing, single point
  254. advantages of single piont are
    • reduces fueling time
    • eliminates skin damage
    • reduces chance of contamination
  255. how to check for leaks in a fuel tank
    • 1/2 psi
    • soap and water
  256. what do you do with old gaskets and seals?
    replace with new
  257. what type of leak may not be visible outside?
    internal leaks in valves
  258. four types of fuel indicators
    • sight glass
    • mechanical
    • electrical
    • electronic
  259. why are electronic more accurate
    measures by weight, not gallons
  260. what is the purpose of baffles
    resist fuel surging
  261. why wait after fueling to check surges?
    allow time for water to settle
  262. determine size of unmarked wire?
    wire gauge (AWG)
  263. why check an electrical system before a load increase?
    ensure wire, cable, or protective device limit will not be exceeded.
  264. what device may cause short time demand load
    • landing gear motors
    • flap motors
    • radio transmitters
  265. what instruments are used to monitor electrical loads?
    ammeters and volt meters
  266. what type breaker should not be used in aircraft
    auto reset
  267. when should a switch be derated?
    when used with high rush in circuits, inductive circuits, DC motors
  268. where are the white position light mounted
    tail, visible from the rear
  269. left position color is? right?
    • red (left)
    • green (right)
  270. factors in wire size selection for electrical power?
    • allowable power loss
    • permissible volt charges
    • current carrying ability
  271. when do electric motors draw several times their rated power?
    start up
  272. how long should bonding wires be?
    short as possible
  273. what hardware should be used to make grounding connections to a structure of dissimilar metal?
    a washer should be used so the corrosion will take place on it.
  274. what should be done to conduit when fittings are not used
    flare the end
  275. what size conduit should be used?
    25% larger than the wire bundle
  276. when is a continuity check made?
    with power off.
  277. three faults associated with electrical systems?
    • opens
    • shorts
    • low power
  278. when is a circuit breaker designed to open
    before the conductor smokes
  279. why would AC electric motor run slow
    • no lube
    • low voltage
    • defective wiring
  280. why would an AC motor run fast?
    • excessive voltage
    • field windings shorted
  281. what controls the output voltage of an alternator
    voltage output of DC exciter
  282. how many lugs can be put on a single terminal strip?
  283. how can a particular wire bundle be identified?
    ID code on wire
  284. where should a circuit breaker be located?
    as close to power source as possible
  285. landing gear warnings or retracts
    • horn or aural device
    • red light
  286. when does an aural device operate in a landing gear system
    throttle retarded and gear is not down and locked
  287. gear down and locked?
    green lights
  288. purpose of MACH warning system is?
    aural warning if speed is exceeded.
  289. difference between take off and landing aural warning.
    • take off = intermittent
    • landing = steady
  290. name items that can cause a take off horn to operate
    • speed brakes
    • flaps stabilizer
    • APU exhaust door open
  291. what does anti skid warning indicate
    • system failure
    • system off
  292. indication of anti skid returning to manual brakes
    warning light
  293. when do you check gear switches, lights, and warning horns or buzzers for ops?
    on a gear retraction check
  294. what gear positions must be indicated
    • secure up
    • secure down
  295. if an aircraft only has one down light, how will the landing gear switches be wired?
    for series
  296. where are the procedures located for checking and adjusting landing gear switches?
    manufacturers manual
  297. what other systems might activate landing warning system?
  298. stall warning is what?
    aural or visual
  299. cabin doors opened or closed
  300. master caution
    alert to system failure
  301. batter over temp is?
    warning lights
  302. purpose of annunciator system is
    to show by warning light the meaning of the condition they announce
  303. source of the anti-skid warning system signal is?
    skid control generator
  304. what will cause a leading edge anti-ice overheat light to illuminate?
    failure of the thermal switch to cause the closure of the anti-ice shut off valve
  305. two methods of inflating boots are
    • engine driven
    • vacuum pump
    • bleed air from turbine
  306. how is deicer boot attached
    cement farring strips and screws or both
  307. function of oil separator
    removes 75% wet pump oil from air
  308. what must be done to a deicer boot prior to cold patch repair?
    return installed tension
  309. what normally keeps deicer boots held down in flight?
    suction is supplied during flight
  310. methods to supply heat for thermal anti-ice systems
    • bleed air
    • engine exhaust heat exchangers
    • ram air heated by combustion heater
  311. how is temp maintained in anti-ice
    mixing heated and cold air
  312. what prevents overheating of the leading edge strip in a thermal anti-ice system that is operated by engine bled air?
    a sensor will cause a valve to close and shut off the flow of hot air
  313. where is a carbon dioxide systems usually used?
    cabins and cockpits
  314. how can you get indications of excess CO2 fumes using a CO2 tester?
    yellow silica gel turns green or tan tablet turns dark gray or black
  315. how does a photo electric smoke detector warn?
    smoke causes an electrical current
  316. how may photo electric detectors be checked?
    switch and test circuit
  317. two types of smoke detection instruments used in aircraft?
    • photo electric
    • visual
  318. what does a thermal switch fire detection system consist of?
    heat sensitive units that complete circuits at certain temps
  319. how are Fenwall spot detectors wired
    parallel between two complete loops of wiring
  320. how are thermal switch switch units wired?
    parallel with each other and in series with lights
  321. how is a thermocouple fire warning system different from a thermal switch system
    thermal switch works at a specific temp; thermocouple system depends on rate of use
  322. what does a continuous loop system consist of?
    one or more wires embedded in a special ceramic core that changes resistance with temperature.
  323. what is a continuous element fire detection system?
    stainless loop containing a discreet element that produces gas when heated and a mechanical switch
  324. types of extinguish systems
    • high rate
    • conventional
  325. most common agent used in a conventional system
  326. agent found in a high rate discharge
    halogenated hydrocarbon (halons)
  327. check freon containers for pressure
    use chart for temperature and pressures
  328. what protects a freon bottle from excessive temp?
    safety disc
  329. purpose of yellow disk in fire system?
    indicates normal discharge.
  330. indications caused by kinks and sharp levels in bends and sensing elements?
    false indicators caused by shorts
  331. how is a freon bottle discharged
    electronically discharge cartridge
  332. service life on discharge cartridge is determined by?
    manual date on cartridge