Engine Flashcards
How much thrust do the engines produce?
(ISA) 13,000 lbs. 14,200 lbs when ATTCS active.
How many igniters per engine?
Two per engine.
How many igniters activate for engine start?
Ground - 1 igniter. Flight- 2 igniters.
What happens when ignition switch is selected to OVRD?
Activates both igniters on the ground or in flight.
What is the OFF position of the igniters used for? Can you turn the ignitors OFF inflight?
OFF is used for dry motoring on the ground. It deactivates ignition and inhibits fuel flow. In-flight, the off position is ignored by the FADEC.
What controls the engines?
Each engine has a 2-channel FADEC. One channel is active and the other channel remains in standby as a backup. They alternate each engine start.
What does the cyan line on the N1 gauge represent during approach? When does it appear?
The minimum N1 bleed requirements in icing conditions. Configured for landing.
What sources are available for engine starting? (4)
APU. Ground Pneumatic (huffer cart or air bottle). Cross Bleed. Windmill start
What engine start protection does the FADEC provide on the ground? (3) In flight?
Hot. Hung. No Light-off. Protection ONLY on the ground.
Describe the engine start sequence.
Start switch momentarily to START:
7% N2 ignition, 20% N2 fuel flow (unless N2 is >120), 20% N2 +5 sec light off, 50% N2 ignition off, starter cutout.
What does WML mean on the engine indications?
Windmilling engine. The FADEC has detected a flame-out and is attempting an auto relight, or an assisted start has been commanded
What heats the fuel and cools the engine oil?
Fuel/Oil heat exchanger.
What is ATTCS?
Automatic Takeoff Thrust Control System. Provides Max Thrust Reserve (RSV). FADEC controlled.
When will ATTCS activate?
N1 difference of 15% or more during;
Takeoff, Go-Around, Windshear Warning.
When is thrust reverse available?
Weight-on-wheels. Triggers are locked in-flight.
What happens if a thrust reverser inadvertently deploys?
FADEC limits respective engine thrust to IDLE.
What is FLEX?
Reduced take off thrust based on assumed temperature. Telling the FADEC that it is warmer than it actually is so it will reduce the thrust.
What types of engines are on the aircraft?
General Electric CF-34-8E5, high-bypass and dual rotor turbofan.
What does the cyan < mean on the N1 gauge?
How about the green - ?
< is Target N1 at TOGA.
- is Target N1 at Max Thrust.
What pre-requisite must be met before the engine will turn off when the START/STOP selector is moved to STOP?
The Thrust Lever must be at IDLE.
What is the Air Turbine Starter (ATS)?
A turbine that accelerates the engine to a self-sustaining RPM level.
What is the starter operation of the engines?
The Starter Control Valve (SCV) opens, providing bleed air to the Air Turbine Starter (ATS) to increase rotor speed for engine start.
What does FADEC provide? (3)
Engine protection. Control of the requested and max N1. Control of the ATTCS.
How many FADEC channels does each engine have?
2 channels. One channel is active and the other channel remains in standby as a backup. They alternate each engine start.
Explain T2.
T2 sensor monitors the engine inlet air temperature for use in FADEC calculations.
Explain N1.
N1 sensor provides fan speed data for the FADEC and airplane vibration monitoring system.
When do we manually abort an engine start?
OIL! No positive oil pressure indication within 10 seconds after N2 speed starts to increase. Oil pressure stabilizes below engine limits. ITT! Hot start, ITT exceeds >815*C. No light off, no ITT within 30 seconds after initiation of fuel flow. N1/N2! Hung start; N1/N2 failing to accelerate to stable idle speed. Tailwind; positive increase of N1 not indicated before starter cut-out (50% N2). MISCELLANEOUS! Intermittent electrical pneumatic or starter malfunction occurs before the starter disengagement.
