Today we are going to look at the pinout for a Sperry Rand Airspeed/Mach Indicator part number 2594621-014. You would, of course, find two of these in the cockpit of the L-1011 with one on the pilot and the other first officer's side. The two A/S indicators would be coupled together as you can see later in the posting.
The airspeed/mach indicator has mechanical elements for airspeed in knots indicated by a pointer, the mach number indicated by a digital readout and a VMO pointer for maximum airspeed. The instrument also a number of flags for Airspeed, Mach and VMO.
Below is the schematic for this instrument and you can see that the data for the instrument would have been provided by the Central Air Data Computer (CADC) via a synchro transmitter.
The pilot and first officer's instruments are able to receive data from each CADC and can be switch from primary CADC to alternate CADC. Below is the schematic showing how the two airspeed/mach indicators are coupled:
Lastly, here is the pinout of the Sperry Rand Airspeed/Mach Indicator:
Format: Connector | Pin | Function
| | |
|---|
| J1 | 02 | Chassy Ground |
| J1 | 03 | 115 VAC 400Hz Power Input |
| J1 | 04 | 115 VAC 400 Hz Power (Lo) - Ground |
| J1 | 05 | Airspeed (X) |
| J1 | 06 | Airspeed (Y) |
| J1 | 07 | Airspeed (Z) |
| J1 | 12 | Airspeed Valid |
| J1 | 13 | Airspeed Valid To/From Opp Indicator |
| J1 | 14 | Airspeed Valid to Opposite Indicator J1 Pin 13 |
| J1 | 16 | Airspeed 26V 400Hz Exciter to ICM |
| J1 | 17 | Airspeed (X) from Opp Indicator |
| J1 | 18 | Airspeed (Y) from Opp Indicator |
| J1 | 19 | Airsped (Z) from Opp Indicator |
| J1 | 20 | Null to ICM |
| J1 | 24 | VMO Speed (X) |
| J1 | 25 | VMO Speed (Y) |
| J1 | 26 | VMO Speed (Z) |
| J1 | 29 | 26 VAC / 400 Hz From Other Side J2 Pin 23 for Instrument Source Select |
| J2 | 01 | Instrument Lighting (Hi) |
| J2 | 02 | Instrument Lighting (Lo) - Ground |
| J2 | 05 | Mach Speed (X) |
| J2 | 06 | Mach Speed (Y) |
| J2 | 07 | Mach Speed (Z) |
| J2 | 09 | VMO Speed 26V 400Hz Excitation to Opposite Indicator J2 Pin 26 |
| J2 | 10 | Mach Speed 26V 400Hz Excitation to Opposite Indicator J2 Pin 25 |
| J2 | 11 | Mach Valid from Opp Indicator |
| J2 | 12 | Mach Valid |
| J2 | 13 | MACH Sped Valid To Opposite Indicator J2 Pin 11 |
| J2 | 15 | Rack Lockout Common |
| J2 | 16 | Rat Lockout Below 100K |
| J2 | 17 | Rack Lockout Pin 1 |
| J2 | 20 | Mach Speed To Opp Indicator (X) |
| J2 | 21 | Mach Speed To Opp Indicator (Y) |
| J2 | 22 | Mach Speed To Opp Indicator (Z) |
| J2 | 23 | Airspeed 26V 400Hz Excitation to Opposite Indictor J1 Pin 29 |
| J2 | 24 | Airspeed 26 VAC / 400Hz Exciter Input from ICM |
| J2 | 25 | Mach Speed 26V 400Hz Exciter from Opposite Indicator J2 Pin 10 |
| J2 | 27 | VMO Speed (X) To/From Opp Instrument |
| J2 | 28 | VMO Speed (Y) To/From Opp Instrument |
| J2 | 29 | VMO Speed (Z) To/From Opp Instrument |
| J2 | 34 | Overspeed Warning Switch Input |
| J2 | 35 | Overspeed Warning Switch - Output |
| J2 | 36 | VMO Valid |
| J2 | 37 | VMO Valid from Opp Instrument |
| J2 | 41 | VMO Valid Output to Opp Indicator J2 Pin 37 |
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