Altimeter Calibration Card. W.O#: 2772. Certified To: 20. Test Point / Ind. Error readings: -1000: -10, 0: 0, 500: +10, 1000: +10, 1500: 0, 2000: +10, 3000: +30, 4000: +20, 5000: NA, 6000: +30, 8000: +10, 10000: +40, 12000: +40, 14000: +30, 15000: NA, 16000: +40, 18000: +30, 20000: +20, 22000: (blank), 25000: (blank), 30000: (blank), 35000: (blank), 40000: (blank), 45000: (blank), 50000: (blank), 55000: (blank), 60000: (blank), 70000: (blank), 80000: (blank).