Power plant Flashcards
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What type of starter
Air turbine starter, drives gear box that drives the N2 section
When does the start valve close
Stop switch light pressed or
When N2 is above 55%
What happens when engine start switch pushed
- L and R 10th stage bleed SOVs open
- 10th stage ISOL valve open
- Start valve for associated engine
N2 speed control
N1 speed control
Up to 79% N1 the FCU Hydromechanically controls the N2 speed
• above 79% N1 control amplifier controls the engine RPM, speed switches must be on for this to happen
What equipment on the accessory gearbox
- Alternator N1 control amplifier
- Lubrication pumps
- HYD pumps
- Fuel pumps, FCU
- Integral Drive Generator IDG
- Air turbine starter
Automatic Performance Reserve APR
When does it activate
• When an engine N1 decreases to 67.6% and the APR
is armed
• APR is armed above 79% N1
IDG FAULT light
Hot temp
Lo oil pressure
What powers the A&B ignition
A is AC essential bus
B is from DC battery bus through a static inverter
Continuos Ignition
On automatically when approaching a stall
T2 Probe
Anti iced with 14th stage bleed air
