Exam (elaborations)
F15 PROPULSION SYSTEMS EXAM QUESTIONS AND VERIFIED ANSWERS
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F15 PROPULSION SYSTEMS EXAM QUESTIONS AND VERIFIED ANSWERS...
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How much thrust is produced by the -220? - ANSWER 14,700lbs at Miland 23,800 at Max
Nozzle closing does what to backpressure/ to N1 turbine/ fan section? -
ANSWER Increases backpressure on N1 turbine which decreases fan
speed
Where will nozzles go if ENG CONTR switch off? - ANSWER Closed
position
Engine RPM indicated in the cockpit is taken from which engine
component? - ANSWER N2 Turbine
What controls the nozzle schedule? - ANSWER Throttle position input
to the MFC, which houses the hydromechanical components controlled
by the DEEC with ENG CONT "ON"
What are the advantages of a turbofan? - ANSWER More power at low
altitude due to bypass air, Engine can operate at higher temps internally
due to increased bypass air, more fuel efficient at high altitudes
What are the disadvantages of a turbofan? - ANSWER Slow to respond
to throttle increases and vulnerable to pressure spikes caused by
malfunctioning nozzles
What hydro system powers the left ramp? Right Ramp? - ANSWER
Left = Utility A
Right = Utility B
, At what airspeeds does the diffuser ramp operate? - ANSWER Starts
to open at .5 Mach and reaches full open at 1.5Mach
What is the small computer that programs movement of the ramps
based on inputs from three probes located forward of the air inlet ducts?
- ANSWER The Air Inlet Controllers (AIC)
How long is operation limited when the TOT TEMP HI caution light
illuminates? - ANSWER Three minutes
What inputs do each AIC receive? - ANSWER Pitot probes on the
forward fuselage, duct pressure proves in the air inlets, AOA and total
temperature probes, and ramp position
What is the emergency position for the ramps? - ANSWER Ramps up
and locked, bypass door closed, and diffuser ramp up and locked
What does illumination of an INLET caution light indicate when ramp
switches are in AUTO? - ANSWER 1. Diffuser ramp has not locked or
unlocked at the appropriate Mach or
2. AIC has failed or is not scheduling properly or
3. The utility hydro system for the inlet has failed
What controls the airframe mounted fuel shutoff valve? - ANSWER
Controlled electrically by the engine master switches or the engine fire
pushbutton
In SEC mode what will the MFC schedule and how? - ANSWER
Engine fuel flow, start bleed position and RCVV position.
Hydromechanically in response to throttle movement, inlet static
pressure, and engine inlet total temp
What is the altitude limitation on the SEC? - ANSWER Unrestricted,
subsonic, below 40,000
What is inhibited when in SEC mode? - ANSWER AB operation
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