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N1 Speed Control (N1 >79%)
At takeoff, climb and cruise power settings (N1 above 79%), the N1 control amplifier controls the engine N1 rpm. The amplifier trims the FCU fuel output to achieve the desired N1 rpm.
With the ENG SPEED switches selected to ON, automatic switchover from N2 to N1 speed governing occurs at 79% N1. Matched movement of the thrust levers produces nearly matched N1 rpm and nearly matched thrust between the engines.
NOTE
If an ENGINE SPEED switch is moved from ON to OFF at high power settings, the engine will revert to N2 speed control. A rapid increase in engine acceleration will occur, and an overtemperature limit may be exceeded.
ENGINE CONTROL Panel
Figure 19.10.3
AUTOMATIC PERFORMANCE RESERVE SYSTEM Description During takeoff, the APR system monitors the N1 rpm of both engines. If a significant loss of N1 rpm is sensed on one engine, the APR system automatically increases the thrust of the remaining engine to the APR thrust rating.
POWER PLANT Description Vol. 2 19.10.6
Oct 05/06
APR activation does not override thrust lever input to the FCU, nor does it restrict movement of the thrust lever.
Operation
The APR system is armed during takeoff when the APR switch is selected to ARM, and both
engines’ N1 rpm is above 79% (N1 speed mode). This is indicated by the APR ARM advisory EICAS message. During a normal takeoff, the advisory message is removed five minutes after APR arming.
During takeoff, the APR system monitors the N1 rpm of both engines through the DCUs. If an N1
rpm drop below 67.6% rpm is sensed at either engine, the system automatically commands both engines to increase N1 speed. Only the normally operating engine can respond, which it does by increasing the N1 fan speed by a minimum of 2%. This increase in rpm equates to an increase of approximately 500 pounds of thrust. No roll-back in N1 rpm occurs when APR thrust has been commanded and the APR system times-out.
When the APR system is activated, a green APR icon appears in the center of the N1 gauge of the operating engine.
APR Test
The APR TEST switches allow the system to be tested on the ground. The system can only be tested successfully with the engines operating. Normal system test operation results in the APR TEST 1 (2) OK advisory EICAS message. If the system fails, an APR INOP caution EICAS message is displayed.
ENGINE CONTROL Panel
Figure 19.10.4
ENGINE OIL SYSTEM Description Oil from each engine nacelle tank is circulated under pressure to lubricate the engine and accessory gearbox.
Components and Operation
The gearbox-driven main lubrication pump pressurizes the lubrication system. Oil flows from the pump through an oil filter, a fuel/oil heat exchanger, and continues through the engine sumps to the bearings and gearbox.
POWER PLANT Description Vol. 2 19.10.7
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