Aircraft performance is accomplished by controlling the  aircraft attitude and power output. Aircraft attitude is the  relationship of its longitudinal and lateral axes to the Earth’s  horizon. When flying in instrument flight conditions, the  pilot controls the attitude of the aircraft by referencing the  flight instruments and manipulating the power output of the  engine to achieve the performance desired. This method can  be used to achieve a specific performance level enabling a  pilot to perform any basic instrument maneuver. The instrumentation can be broken up into three different  categories: control, performance, and navigation. The control inst ruments depict immediate attitude and power  changes. The  instrument for attitude display is the attitude  indicator. Powe r changes are directly reflected on the manifold  pressure gauge and the tachometer.  [Figure 6-25]  All three  of these  instrume nts can reflect small adjustments, allowing  for precise control of aircraft attitude. XPDR 5537 IDNT LCL23:00:34  VOR 1  270 °  2  1  1  2  4300  4200  4100  3900  3900  3800  4300  3600  3500  3400  3300  3200  3100  20 80 4000 4000  130  120 110 90 80 70  1 100 9 TAS 100KT  OAT 7°C  ALERTS  NAV1 117.60 117.90 NAV2 117.90 117.60 132.675 120.000 COM1 118.525 132.900 COM2 $_{WPT }$_ _ _ _ _ _$_{ DIS }$_ _ ._ $_{NM}$ $_{DTK }$_ _ _$_{°}$ TRK 360° N-S  E-W  VOLTS  27.3 2090 NAV1 117.60 117.90 NAV2 117.90 117.60 132.675 120.000 COM1 118.525 132.900 COM2 $_{WPT }$_ _ _ _ _ _$_{ DIS }$_ _ ._ $_{NM}$ $_{DTK }$_ _ _$_{°}$ TRK 360° MAP - NAVIGATION MAP  XPDR 5537 IDNT LCL23:00:34  VOR 1  270 °  2  1  1  2  - 5 00 4300  4200  4100  3900  3900  3800  4300  3600  3500  3400  3300  3200  3100  20 80 4000 4000  130  120 110 90 80 70  1 100 9 TAS 100KT  OAT 7°C  ALERTS  NAV1 108.00 113.00 NAV2 108.00 110.60 134.000 118.000 COM1 123.800 118.000 COM2 $_{WPT }$_ _ _ _ _ _$_{ DIS }$_ _ ._ $_{NM}$ $_{DTK }$_ _ _$_{°}$ TRK 360° N-S  E-W  $_{5}$338  $_{1}$1652  200  46  13.7  2300  23.0  Figure 6-24.  Emergency back-up of the airspeed indicator, attitude indicator, and altitude indicator. Figure 6-25.  Control instruments. Control Instruments Control and Performance Method 6-18