Bus Guide THS, Thr Lvrs, Switching Panel

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Author:
jsperry843
ID:
210881
Filename:
Bus Guide THS, Thr Lvrs, Switching Panel
Updated:
2013-04-02 01:39:08
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Bus Guide
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Description:
THS, TLs, Switching Panel
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  1. TRIMMABLE HORIZONTAL STABILIZER (THS)

    How is the THS normally operated in flight?
    The flight control computers control trim functions automatically.
  2. TRIMMABLE HORIZONTAL STABILIZER (THS)

    If NO hydraulic power is available can the THS be positioned?
    No - the THS requires hydraulic power from the Green or Yellow systems.
  3. TRIMMABLE HORIZONTAL STABILIZER (THS)

    If a complete flight control computer failure occurs can the THS be positioned?
    Yes - mechanical trimming is possible by manually positioning the Pitch Trim Wheel.
  4. TRIMMABLE HORIZONTAL STABILIZER (THS)

    Can you move the Pitch Trim Wheel if all systems are working normally?
    Manual inputs have priority over computer inputs. CAUTION - The A/P will disconnect!
  5. TRIMMABLE HORIZONTAL STABILIZER (THS)

    What happens to the THS after landing?
    The trim automatically resets to zero. *Part of the walk around preflight check.
  6. ENGINE / THRUST LEVERS

    What controls the engine in all operating regimes?
    FADECs (Full Authority Digital Engine Controls)
  7. ENGINE / THRUST LEVERS

    What functions does the FADEC control?
    • Fuel metering
    • Engine limits based on thrust lever angle.
    • Start sequencing
    • Provides engine indications and thrust limit displays on the E/WD.
  8. ENGINE / THRUST LEVERS

    What redundancy does the FADEC have?
    Dual channel - one channel is active while the other is standby.
  9. ENGINE / THRUST LEVERS

    What is the power source for the FADEC?
    • Has it's own alternator making (independent of the aircraft electrical sys.) electric when N2 is above a set value.
    • If this alternator fails, the FADEC auto switches to aircraft electrical power.
  10. ENGINE / THRUST LEVERS

    When will FADEC abort a start?
    • Hot start
    • Stalled start
    • No ignition
  11. ENGINE / THRUST LEVERS

    If the FADEC detects a fault during auto start, is any crew intervention req'd?
    No - FADEC will discontinue the start, clear the engine and attempt a restart (if warranted) automatically.
  12. ENGINE / THRUST LEVERS

    When does FADEC command a higher engine idle speed?
    • Bleed demands
    • Appr Config
    • High engine or IDG temps
  13. ENGINE / THRUST LEVERS

    How many igniters fire during a Normal auto ground start sequence?
    • 1 - only A or B, igniter with the other acting as backup
    • The FADEC auto. alternates the A/B igniters every start.
  14. ENGINE / THRUST LEVERS

    How many igniters fire on manual or in-flight starts?
    2 - Both A & B
  15. ENGINE / THRUST LEVERS

    When does continuous ignition auto operate?
    • Engine Anti-ice ON
    • Engine flameout detection
    • Failure of the EIU
  16. ENGINE / THRUST LEVERS

    What are the 5 detent positions of the thrust levers?
    • TOGA
    • FLX MCT
    • CL
    • IDLE
    • MAX REV
  17. ENGINE / THRUST LEVERS

    On the ground, how do you arm the A/THR?
    • By setting the thrust levers in the TOGA or FLEX gate (when a FLEX temperature is inserted in the MCDU).
    • At least one FD must be ON for A/THR to arm during takeoff.
  18. ENGINE / THRUST LEVERS

    What is the active range of the A/THR?
    • Just above IDLE to the CL detent (2 engines).
    • Just above IDLE to the MCT detent (1 engine).
  19. ENGINE / THRUST LEVERS

    What is the normal operational detent position of the thrust levers when A/THR is active?
    The CL detent.

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