Left Instrument Panel
Servopneumatic Altimeter
Control and indicator for the servopneumatic altimeter.
| No. | Control/Indicator | Function |
|---|---|---|
| 1 | Altimeter readout | Displays altitude digitally on three drums showing 10,000, 1,000, and 100 of feet respectively. It also displays altitude on a pointer on a circular scale indicating 100’s of feet. |
| 2 | Baroset knob | Sets local pressure in inches of mercury (in.Hg). Only used locally on the altimeter readout, all other digital indicators (via CADC) use a set 29.92 in.Hg value. |
| 3 | Local Barometric Pressure | Indicates barometric pressure setting, also called the Kollsman Window. |
| 4 | Mode switch | Three-position switch, spring-loaded to return from RESET. If power and altitude data from CADC are present, the switch can be held in RESET for 3 seconds to allow normal (servoed) mode of operation. If set to STBY or power or CADC data is absent for more than 3 seconds the system switches to backup (pressure) mode. |
| 5 | STBY flag | Red flag reading STBY that appears if the system is in backup (stand-by) mode. |
Airspeed Mach Indicator
Indicated airspeed and Mach number display.
| No. | Control/Indicator | Function |
|---|---|---|
| 1 | Airspeed dial | Shows indicated airspeed on three scales, two for indicated airspeed and one moving for Mach number. |
| 2 | Indicated airspeed scale (outer) | Used to indicate indicated airspeed up to 200 knots. |
| 3 | Indicated airspeed scale (inner) | Used to indicate indicated airspeed from 200 knots to 850 knots. Covered by the airspeed dial until relevant. |
| 4 | Mach number scale | Moving scale used to indicate Mach number. Moved to show the correct Mach number relative to indicated airspeed. |
| 5 | Indicated airspeed index pointer | Can be set to the desired indicated airspeed. |
| 6 | Mach number index pointer | Can be set to the desired Mach number. Not visible in image. |
| 7 | Safe Mach number index pointer | Shows safe Mach number calculated by the CADC. Not visible in the image. |
| 8 | Index knob | Knob with a pull-out and push-in position. One sets the indexer for indicated airspeed and the other for Mach number. |
Standby Attitude Indicator
Standalone standby attitude indicator.
An OFF flag is visible on the left side when caged or when un-powered.
The knob below and to the right of the indicator cages/un-cages the indicator and allows trim to correct pitch. In the pulled-out position, the indicator is caged. When pushed in, un-cages the indicator and allows pitch trim by turning the knob.
UHF Remote Indicator
Remote indicator displaying set frequency or channel on UHF 1 (AN/ARC-159). Displays a readout of the frequency or channel set for the UHF 1 radio.
The TEST button initiates a test for the indicator, no fault results in a readout of 888.888.
The DIM knob controls display brightness.