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adverse weather conditions. The ignition system consists of the ignition power
supply ,engine ignition control, 2 ignition exciters, 2 spark igniters and 2 triaxial
shielded ignition leads.
[3] Bleed air is extracted from the high pressure compressor for the following
systems:
air-conditioning
cabin pressurization
wing and engine inlet cowl anti-icing
hydraulic tank pressurization
potable water tank pressurization
Fan air is used as cooling air for the precooler to limit the temperature of the bleed
air in the pneumatic manifold. Fan air is also used for cooling the generator and
thrust reverser.
[4] The thrust reverser system reverses the direction of the fan exhaust during
landing and provides additional braking of the airplane. The reverser sleeve is part
of the engine cowling. The actuating system is on the reverser. The control and
indicating system are located remote from the engine. The reverser can only be
deployed on the ground with hydraulic pressure available. Prior to deployment the
engine thrust lever must be at idle position.
Fig 17-1 Thrust reverser operation
In figure 17-1 ,10 blocker doors are arranged around the forward section of the
thrust reverser sleeve. The forward section of the blocker door is attached to the
sleeve with two bolts, the blocker door drag link attaches the blocker door to the
inner duct. The drag link attaches to the blocker door with a link attachment fitting
and to the inner duct with a bolt. As the sleeve translate aft , the blocker doors rotate
into a blocking position, due to sleeve movement and the doors attachment to the
inner duct. When extended, the blocker doors block the fan exhaust, forcing air in
the reverse direction through the cascade segments. When retracted, the doors form
part of the outer duct for fan exhaust air.
[5] The engine and hydraulic parameters are displayed on two engine instrument
panel (EIS ) using light emitting diodes (LED ).
Fig 17-2 Engine instrument panel
Engine displays and controls on the center panel consist of the following
 N1 displays indicate fan speed in percent rpm.
 N2 displays indicate high pressure compressor speed in percent rpm.
 Exhaust gas temperature (EGT) displays
1. indicate temperature of exhaust gas in ℃.
2. a red light above each N1, N2, and EGT display illuminates if that
engine exceed its redline.
 Fuel flow displays
1. indicate fuel flow in weight of fuel per hour and also total fuel
consumed per engine.
the FUEL FLOW/FUEL USED switch is used to change display from FUEL FLOW
to FUEL USED, after 10 seconds the FUEL USED display reverts to FUEL FLOW.
 The FUEL USED RESET—display a sequence: fuel used since last reset
or power-up, then 000, and finally fuel flow.
 Engine oil pressure displays—display engine oil pressure in psi.
 Engine oil temperature displays—display engine oil temperature in ℃.
 Engine oil quantity displays—display oil quantity of engine in percent of
full.
 Engine vibration displays—display engine maximum vibration. Hydraulic
pressure displays—display hydraulic systems pressure in psi.
 Hydraulic quantity displays—display hydraulic system quantity in % of
full.
EXERCISE
A. Find out the explanations of the following words in your “English-chinese
technical dictionary”
1. start valve [ P1-143 ]
2. ignition system [ P1-79 ]
3. ignition exciter [ P1-79 ]
4. torque tube [ P1-156 ]
5. acceleration [ P1-1 ]
6. stage [ P1-142 ]
7. igniter [ P1-78 ]
8. precooler [ P1-116]
9. blocker door [ P1-21 ]
10. cascade [ P1-27 ]
11. cascade vane [ P1-27 ]
12. light emitting diode [ P1-91 ]
13. exhaust gas temperature [ P1-55 ]
B. Translate the following sentences into chinese.
1. The engine starting system provides air, fuel , ignition and torque for rotating
the engine to an rpm at which the engine can accelerate to idle rpm.
2. The engine may be started with air from the APU, from a ground source, or by
using engine crossbleed.
3. The purpose of the ignition system is to produce a high current electrical spark to
ignite the fuel/air mixture in the engine combustion chamber during starting.
4. The thrust reverser system reverses the direction of the fan exhaust during
landing and provides additional braking of the airplane.
5. The engine and hydraulic parameters are displayed on two engine instrument
panel (EIS), the N1 displays indicate fan speed in percent rpm, a red light above
each N1 display illuminates if that engine exceed its redline.
　
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