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T.O. GR1F16CJ1 1216 AIRSPEED/MACH INDICATOR The airspeed/mach indicator is pneumatically operated by total and static pressure supplied by the pitotstatic system. The indicator displays indicated airspeed and mach number. Indicated airspeed is displayed by a moving airspeed/mach pointer against a fixed airspeed scale. Mach number, which is read against the airspeed/mach pointer, is displayed by a rotating mach scale. The range of the indicator is from 80850 knots and from 0.52.2 mach. The maximum allowable airspeed pointer indicates 800 knots at sea level. Higher airspeeds are indicated as altitude is increased. This indication is not a valid maximum allowable airspeed cue; it should be disregarded. Refer to MAXIMUM AIRSPEED OPERATING LIMITATIONS, Section V. The SET INDEX knob is used to set the airspeed reference index. STANDBY ATTITUDE INDICATOR (SAI) The SAI is a selfcontained, electrically powered vertical gyroscope that mechanically positions the attitude sphere of the indicator to display aircraft pitch and roll attitudes. Manual caging of the gyroscope is accomplished by pulling the PULL TO CAGE knob at the lower right corner of the indicator. The knob is held out until the sphere is caged to zero pitch and roll indication and then released. Adjust ment of the miniature aircraft reference symbol is accomplished by rotation of the PULL TO CAGE knob. Since the SAI is mounted in the instrument panel at an angle, it indicates a pitch angle of 4 degrees less than the ADI when pitch trim knobs on both indicators are set at the pitch trim index. If caging is required, the aircraft should be flown wings level, constant altitude, and at an AOA of approximately +4 degrees. When caged on the ground, allow 2 minutes prior to taxi. An OFF warning flag appears whenever electrical power is lost or whenever the PULL TO CAGE knob is pulled. After power loss, the indicator continues to provide usable attitude information for approxi mately 9 minutes. The gyroscope of the indicator is unrestricted in roll but is limited to approximately " 85 degrees in pitch. The indicator can develop errors during aerobatic maneuvering, primarily when pitch is near 90 degrees. If these errors exceed 7 degrees after returning to level flight, erection is cut off. If this occurs, the gyro does not automatically erect and must be manually caged to eliminate the error. The indicator is powered by battery bus No. 2. VERTICAL VELOCITY INDICATOR (VVI) The VVI displays rate of climb/descent information provided by the CADC. The indicator has a vertically moving tape display with a range of 6000 fpm climb or dive. The VVI is powered by emergency ac bus No. 1. MAGNETIC COMPASS The magnetic compass is a selfcontained indicator which shows the heading of the aircraft with respect to magnetic north. Adjustable compensating magnets in the compass provide the means for cancelling magnetic disturbances originating within the air craft. A deviation correction card for the compass is located immediately below and aft of the compass. ATTITUDE DIRECTOR INDICATOR (ADI) Refer to figure 188. The ADI displays pitch and roll attitude information supplied by the EGI/INS. The ADI is not limited in pitch or roll and displays any aircraft attitude accurately. In certain modes of operation, the indicator displays ILS glide slope and localizer deviation information. The instrument displays turn rate which is presented in standard turn needle format. The turn rate needle is driven by the rate gyroscope transmitter which senses the aircraft turn rate and displaces one needle width in response to a 11/2degree/second turn rate. The slip indicator (ball) is a selfcontained item. The pitch trim knob is used to adjust the attitude sphere to the desired pitch attitude in reference to the miniature aircraft. The OFF warning flag may indicate failure of either the EGI/INS or the ADI. A momentary OFF and/or AUX flag, even with proper attitude being displayed, may indicate impending failure of the ADI or EGI/INS data to the ADI. The GS warning flag indicates that the glide slope deviation bar is unreliable. The LOC warning flag indicates that the localizer signal is unreliable. The AUX warning flag signifies that the EGI/INS has failed or is operating in a less precise attitude condition and that HSI heading must be set to a known heading by the C
DF INSTR HDG knob on the INSTR MODE select panel. HORIZONTAL SITUATION INDICATOR (HSI) Refer to figure 189. The HSI displays horizontal or plan view of the aircraft with respect to the navigation situation. The miniature aircraft symbol in the center of the HSI is fixed and comparable to an aircraft superimposed on a compass rose. The face of the HSI is a compass card driven by the EGI/INS so that aircraft magnetic heading is always read at the upper lubber line. |