





The ACK A-30.5 is a TSO-approved gray code altitude encoder providing accurate pressure altitude data to compatible transponders for reliable Mode C operation.
| Condition | Factory New |
| Certification | FAA 8130 or EASA Form 1 |
| Warranty | 24 Months |
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The ACK A-30.5 Altitude Encoder is a TSO-approved pressure altitude reporting device designed to supply accurate gray code altitude data to compatible aircraft transponders. It enables proper Mode C altitude reporting, supporting air traffic control separation and surveillance requirements.
Using industry-standard gray code output, the A-30.5 is compatible with a wide range of legacy and modern transponders commonly installed in general aviation aircraft. Its compact design allows for flexible installation, making it suitable for both new avionics installations and replacement of older altitude encoders.
Manufactured by ACK Technologies, the A-30.5 is engineered to meet aviation reliability and accuracy standards. When installed and calibrated in accordance with approved aircraft data and manufacturer instructions, it provides dependable altitude information critical for safe and compliant flight operations.
| Certifications | FAA TSO C-88a German LBA 10.221/4 |
|---|---|
| Range | MOD 5: –950 to 30,750 ft |
| Accuracy | ±20 ft, typical ±50 ft, maximum |
| Operating voltage | 10 VDC to 32 VDC |
| Operating current | 160 mA, typical |
| Operating temp | -4°F to 131°F -20°C to 55°C |
| Warm-up current draw | 14 VDC @ 160 mA 28 VDC @ 220 mA |
| Warm-up time | 70°F ambient 60 seconds 0°F ambient 210 second |
| Altitude resolution | Gray code (parallel) output 100 ft |
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