ATI 767 ORAL part 4

  1. ANTI-ICE - Which items are heated electrically?
    • Windows
    • pitot tubes
    • static ports
    • AOA vanes 
    • TAT probe (TAT in flight only)
  2. ANTI-ICE - Which items are heated Pneumatically?
    • Outboard 3 slats (757)
    • 3 mid wing leading edge slats (767)
    • leading edge of the engine inlet cowl
    • window defog
  3. ANTI-ICE - Wing control valves
    Wing anti-ice control valves: electrically controlled and pneumatically operated valves (one each wing)
  4. ANTI-ICE - Wing switch/VALVE light
    • WING switch ON: Open wing shutoff valves allow engine bleed air flow to outboard 3 slats.
    • VALVE light: -valve not in commanded position.
    • Operations: Inhibited on the ground as a function of air/ground logic.
  5. ANTI-ICE - STATUS - Flight: (Descent)
    • STATUS - Flight: (Descent) ON at or below 22,000 ft., TEMPERATURE: TAT 10°C or less including SAT less than -40°C;
    • CONDITIONS: Visible Moisture; Runway and/or taxiway is contaminated with standing water, slush, or snow.
  6. ANTI-ICE - Engine Cowl - Switch/VALVE light
    • electrically controlled and pneumatically operated.
    • a. ENGINE L or R switch ON: Engine inlet cowl leading edge is heated using engine bleed air. Engine idle is Increased.
    • VALVE light-valve not in commanded position.
  7. ANTI-ICE - Engine Cowl AUTO
    • Ignition is turned on automatically if ignition switch is in AUTO. (The other AUTO operation is ignition on continuously with flaps extended.)
    • TAI and N1 bug appear as a function of switch position and is no indication that engine anti-ice is working properly.
  8. ANTI-ICE - Engine Cowl Operations
    • Operations: i. Do not use engine anti-ice below -40°C OAT.
    • STATUS: All Ground Ops - TEMPERATURE: OAT 10°C and below
    • CONDITIONS: Visible moisture: precipitation; visibility 1 mile or less (1600m); RVR 5000 or less.
    • STATUS: Flight (Climb & Cruise) - TEMPERATURE: TAT 10°C to SAT-40°C
    • CONDITIONS: visible moisture present or anticipated.
    • STATUS: Flight (Descent) - TEMPERATURE: TAT 10 C or less, including SAT less than - 40°C
    • CONDITIONS: visible moisture present or anticipated.
  9. WINDOW HEAT - how are they heated? Which ones are heated?
    • Electrically heated for anti-ice and anti-fogging. The side windows electrically heated for anti-fogging only. (No anti-ice.)
    • Overheat protection is provided for all windows.
    • Window cracked or crazed - no restrictions
    • lights auto illuminate for any of the following:
    • a. Landing Gear not up and locked, or
    • b. Flap Lever not UP, or
    • c. Cabin Altitude above 10,000 ft or
    • d. MN DK ALERT
    • USE OXY selected or
    • Pressing the CARGO/DEPR switch
  11. MN DK ALERT - 3-position rotary switch
    • AUTO position, MN DK ALERT activated if:
    • Cabin alt exceeds 10,000' 
    • MN DK Cargo Fire Depress switch is pushed

    • MN DK ALERT indications:
    • Cabin entry lights, lavatory dome light, and alternating main deck cargo lights flash.
    • Warning horn sounds in cabin; chime in lavatory.

    • The Main Deck Alert system resets after 20 seconds.
    • Rotate switch to RTS position, cabin lights flash (if ON) for 20 seconds but no horn.
    • Rotate switch to USE OXY position, the entire Main Deck Alert system is activated for 20 seconds.
    • a. AUTO 1 and 2 both identical but independent systems to auto control outflow valve.
    • b. Auto 1 uses L AC, Auto 2 uses R AC.
    • c. MAN uses STBY DC.
    • d. AUTO 1/AUTO 2 - control outflow valve at rate set on AUTO RATE knob.
    • a. Index mark approx. 500 fpm climb/300 fpm descent.
    • b. Min 50 fpm, max 2,000 fpm
    • both auto AC controllers inop or select switch
    • in MAN
  15. CABIN ALTITUDE CONTROL - Loss of either AUTO 1/AUTO 2
    • No EICAS message, but will get a Status message.
    • MANUAL Climb/Descend selector only active when Mode select switched to MAN. Directly drives outflow valve using STBY DC motor.
  16. CABIN ALTITUDE CONTROL - Auto Rate Controller
    • Sets limit for cabin rate of climb, descent, proportional to acft climb/descent.
    • Enters cruise mode after acft in level flight for one minute
    • leaving cruise altitude +/- 500 ft will cause the controller to enter climb/descent mode
  17. When will outflow valves close automatically?
    • Above 11,000' automatically closes the outflow valve with aneroid switch.
    • Resets when cabin descends below 9,500' (8,500)?
  18. Pressure differntial for TO and LDG
    • .125 psi differential for takeoff and landing.
    • When both throttles advanced greater than 10°, cabin pressurizes to slightly below airport elevation
  19. Max diff press? Positive and negative press relief?
    • 8.6 psid reached at FL350 and is maintained up to FL431.
    • 2 positive press relief valves, left side of the fuselage aft of the left wing
    • open at 9.1 psid.
    • 2 negative press relief valves on each electrically operated cargo door.
    • Automaticly switches to other Auto mode.
    • Failure of both auto controllers -outflow valve position freezes.
  21. LOSS OF PRESSURIZATION (cabin at 10,000)
    • a. Siren sounds
    • b. Master warning and CABIN ALT and CABIN ALTITUDE discrete lights ON.
    • c. EICAS warning message, CABIN ALTITUDE.
    • d. Cabin alt warning resets when cabin alt reaches 8,500 feet.
  22. EQUIP COOLING - Valves
    • Inboard Supply Valve: supplies air from the left utility tunnel of the fwd lower cargo compartment to the cooling system.
    • Overboard Exhaust Valve: ports equipment exhaust air overboard; if left open during takeoff, the acft will not pressurize. Closed in flight; closed on ground if fuselage skin 
    • temperature is 45°F.
    • c. Override Valve: ports air overboard from the equipment cooling system. Normally closed in flight and ground.
    • d. Bypass Valve: allows equipment exhaust air to reach the skin heat exchanger. Open when acft skin temp is 45°F.
    • Air Conditioning Manifold Interconnect Valve: Allows conditioned air from the flight compartment to enter the equipment cooling system. 767-281, normally open to the flight compartment in flight as long as the left pack is ON. 767-300, normally closed unless OVRD is selected.
  23. OVHT light (Advisory msg: FWD EQPT OVHT)
    • Low airflow or high temperature is sensed.
    • Selection of STBY extinguishes and inhibits light for 5 minutes to allow cooling to start up before looking at it again.
    • Selection of OVRD deactivates OVHT light, opens the override valve to port equipment cooling airflow overboard
  24. SMOKE light (Advisory msg: FWD EQPT SMOKE)
    • Smoke is sensed in the forward equipment cooling ducts.
    • Placing the EQUIP COOLING selector in OVRD allows conditioned air to be drawn in reverse through the system by differential pressure and exhausted overboard through the SMOKE/OVRD valve.
  25. NO COOLING light (Caution msg: FWD EQPT COOLING)
    • No cooling airflow is sensed after selecting OVRD and indicates there is no reverse air flow for the E/E compartment avionics.
    • STBY should be used if the NO COOLING Light illuminates after OVRD is selected.
    • STBY ensures equipment cooling, but smoke removal will be with the normal flow of airplane exhaust air.
  26. EQUIP COOLING - on the ground
    On ground both exhaust and supply fans operate and if the engines are shut down.
    • AUTO-Ground: The sys is automatically configured dependent on engine operation, pack operation, air/ground logic and ambient temp. Both fans normally operate.
    • AUTO-Flight: only the exhaust fan operates and the bypass shutoff valve is open. If the Exhaust fan fails the supply fan automatically switches on.
    • STBY: positions equipment cooling system for inboard airflow.
    • OVRD: positions equipment cooling system for reverse airflow.
  28. What happens if there is and Equipment cooling overheat on the ground?
    • warning horn in the nose wheel well will sound
    • Selecting OVRD on the ground causes the warning horn in the nose wheel well to sound.
  29. CARGO HEAT Switch
    • provides power for shut off valve to open and heat control valve to cycle open and closed for automatic temperature control.
    • The 3 lower cargo compartments regulated 45°F-90°F. No temp indicators
  30. CARGO OVHT light (Advisory msgs: FWD, AFT, BULK CARGO OVHT)
    • cargo compartment temperature above standard control range (90°F).
    • Shutoff valve signaled closed.
    • If both valves are closed, OVHT light inhibited
  31. PNEUMATICS  - AIR sources
    • Engines
    • APU
    • ground air source
  32. PNEUMATICS - What is bleed air used for?
    • Air conditioning
    • Pressurization
    • Engine start
    • Cargo Heat
    • Wing Anti-Ice and Engine Anti-Ice
    • Center Hydraulic system Air Driven Pump (ADP)
    • Hydraulic reservoir pressurization
    • Thrust reverser operation (CF6-80C2 engines)
  33. PNEUMATICS - High and Low pressure air?
    • LP used during high power settings
    • HP used during low power settings (like during descent)
    • HP is controlled by an electrically-controlled pressure actuated valve called the High Stage Valve (HSV).
    • LP is protected from HP air by a check valve, which is closed during low-thrust settings.
    • As thrust is increased, the HSV closes and the LP check valve opens to supply bleed air.
    • Armed when the engine bleed air switches are selected ON.
    • The valves are pressure actuated and remain closed until engine bleed air pressure is sufficient to cause forward flow.
    • The valves may close when the APU is starting either engine.
    • The valves may close when Ground Pneumatic Air is connected or during periods of low engine bleed air demand, such as when Air Conditioning Packs are OFF.
  35. PNEUMATICS - BLEED light (Caution msg: L, R ENG HPSOV)
    • Overpressure problem
    • HPV is open when commanded closed
  36. PNEUMATICS - HI STAGE light (Advisory msg: L, R ENG HI STAGE)
    • Overheat problem
    • HP shutoff valve commanded closed
  37. PNEUMATICS - APU bleed Air Supply
    • Primarily used during ground ops for pack operation and engine starting.
    • Can be used up to 17,000 feet.
    • APU bleed air is connected to the center pneumatic duct.
    • Controlled by APU bleed air switch.
    • VALVE light (Advisory msg: APU BLEED VAL) indicates valve not in commanded position.
    • APU protected against reverse airflow from engines by a check valve.
    • Bleed valve closes after first engine is started; opens again after engine bleed auto closes to start the next engine.
  39. PNEUMATICS - Ground Pneumatic Supply
    • Two connectors Located on the left side of the fuselage, near the wing root.
    • Check valves prevent air from leaking overboard or into ground pneumatic cart, when connected.
  40. Bleed Air Duct System - C Duct
    • Supplies ADP
    • Supplies aft and bulk cargo heat
    • Supplies TAT for aspiration
    • Supplies C Hyd Reservoir
    • Can be protected from reverse airflow from the crossover duct by a normally-open electrically-operated isolation valve.
    • C duct ISLN valve guarded in the ON (open) position.
  41. Bleed Air Duct System - L Duct
    • Supplies L Pack
    • Supplies L wing anti-ice
    • Supplies L Hyd Reservoir
    • Protected from reverse airflow from the crossover duct by a one-way check valve.
    • L ISLN Valve - allows bleed air to flow from crossover duct to the L sys duct. Normally OFF (closed) for flight.
  42. Bleed Air Duct System - R Duct
    • Supplies R Pack
    • Supplies R wing anti-ice
    • Supplies R Hyd Reservoir
    • Protected from reverse airflow from the crossover duct by a one-way check valve.
    • L ISLN Valve - allows bleed air to flow from crossover duct to the R sys duct. Normally OFF (closed) for flight.
  43. Bleed Air Duct System - Cross-over duct
    • Supplies air through Land R isolation valves (normally closed, electrically-operated valves) to respective Land R ducts for engine starting and/or non-normal situation.
    • Supplies forward cargo compt heat.
    • Normal to fly with ISLN valves OFF (closed).
  44. DUCT LEAK light (Caution msgs: L, R BLD DUCT LEAK; BODY DUCT LEAK)
    • Bleed air leak detected along the respective pneumatic duct.
    • Leak detection accomplished using continuous loop type element that activates at a predetermined temperature.
    • Bleed must be isolated and source turned off to prevent structural damage.
    • When area in question cools sufficiently, the message disappears and light extinguishes.
  45. Air Conditioning
    • 2 identical electrically-controlled, pneumatically operated PACKS (Pressurization/Air-Conditioning Kit)
    • Supplies conditioned air to flight deck, fwd and aft cabin zones.
    • Pack control, zone temperature control, fault detection and overheat protection are all automatic when the pack selector is in AUTO
  46. Air Conditioning - How are packs controlled?
    • Each pack is controlled by two identical Auto Pack Controllers.
    • Pack output automatically increased (high flow) during high pack demand periods (like a failed pack).
    • Pack output automatically limited (low flow) during high bleed air demands, such as with a failed engine.
  47. Air Conditioning - Pack Valve
    • Electrically-controlled, pneumatically-operated
    • Shut off valve for Pack
    • Flow control valve for Pack; controls flow rate to a schedule based on airplane altitude.
    • PACK OFF light = Pack Valve closed
    • Pack selector to AUTO or STBY sends an open signal to this valve.
  48. Air Conditioning - Air conditioning auto mode (Pack selector in AUTO)
    • Pack output temp determined by Land R Cabin Temp Controllers. Output temp is determined by the coldest request.
    • Pack internal overheat protection is active when Pack is active.
    • Pack exit air is monitored by the "exit air overheat" sensors.
    • Zone temp is satisfied by the Zone Temp Controllers using trim air.
    • Air is ducted to a mix manifold
    • Compartment temp detects actual temp sensed in the compartment.
  49. Air Conditioning - PACK HIGH FLOW
    • Armed whenever pack is on. Higher than normal air flow is provided:
    • On ground, when APU or ground pneu cart is supplying air
    • 1 pack inop
    • Max engine thrust limit automatically reduced.
  50. Air Conditioning - PACK HIGH FLOW INHIBIT
    • Wing anti-ice is ON and only one engine supplying bleed air.
    • 1 engine inop
    • Flaps not up
    • Aft cargo compt BTL DISCH arming switch pushed
  51. Air Conditioning - Air Conditioning STBY Mode
    • Pack output temp determined by pack selector position.
    • N(normal) yields a constant, moderate temperature. 24°C
    • W (warm) yields an output temp that is controlled by ram air flowing across the pack heat exchangers and will be dependent upon ambient condition
  52. Air Conditioning - Ground Conditioned Air
    • Plugs into the L distribution system
    • Dumps into mix manifold.
  53. Air Conditioning - Zone INOP light (Advisory msg: L, R PACK TEMP)
    • Fault in the zone temp controller
    • The compartment temp selector is OFF. (FWD/AFT cabin only)
    • The Trim Air switch is OFF if all 3 come on.
  54. Air Conditioning - Fit Deck MAN
    If Fit Deck MAN -(manual control) for flight deck and is spring loaded to 6 o'clock position when selected.
  55. Pack INOP light (Advisory msg: L, R PACK TEMP)
    • Exit air overheat. Selecting STBY will NOT extinguish the light. After 5 minute cooling period, attempt to restore pack operation by pushing Pack Reset Switch
    • Pack internal overheat
    • Auto controller fault. Selecting STBY will extinguish light
  56. Air Conditioning - PACK OFF light
    pack valve is closed. The other pack goes to Hi flow to compensate.
    • APU fire (on P40 panel on back of nose strut).
    • Ground crew call horn in nose wheel well sounds if the equipment cooling selector is put to OVRD on the ground.
    • Ground crew call horn in nose wheel well sounds if IRUs still on 5 minutes after main AC power is shut down.
Card Set
ATI 767 ORAL part 4
ATI 767 ORAL part 4