FCOM 3.04.34 p6:
FLIGHT INSTRUMENT TOLERANCES
The values given below apply to aircraft in symmetrical flight (no sideslip), in clean configuration, and in straight and level flight.
ALTITUDE TOLERANCES
- PFD 1 or 2 at ground check : ± 25 feet (8 m) - standby altimeter at ground check : ± 300 feet (91 m)
Note: On ground, as the standby altimeter’s vibrator is off, the standby altimeter’s tolerance value is high. In flight, the vibrator is on and the value is lower.
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SUPPLEMENTARY TECHNIQUES 3.04.34 P 6
NAVIGATION SEQ 001 REV 32
FLIGHT INSTRUMENT TOLERANCES (non ISIS fit)
The values given below apply to aircraft in symmetrical ight (no sideslip), in clean
conguration, and in straight and level ight.
ALTITUDE TOLERANCES
- PFD 1 or 2 at ground check : ± 25 feet (8 m)
- standby altimeter at ground check : ± 300 feet (91 m)
Note: On ground, as the standby altimeter’s vibrator is off, the standby altimeter’s
tolerance value is high. In ight, the vibrator is on and the value is lower.
MAX IMUM DIFFERENCES BETWEEN ALTITUDE IN DICATIONS
FL/SPEED
ALTITUDE (ft) COMPARISON BETWEEN
(1) ADR 1 and ADR 2 (on PFD)
(2) ADR 3 and ADR 1 or ADR 3 and ADR 2 (on PFD)
(3) STBY ALTI and any ADR 1 or 2 or 3
(1) (2) (3)
GND CHECK 20 (6 m) 20 (6 m) *
FL50/250 kt 50 (15 m) 80 (24 m) 130 (40 m)
FL100/250 kt 55 (17 m) 80 (24 m) 185 (56 m)
FL200/300 kt 90 (27 m) 145 (44 m) 295 (90 m)
FL300/.78 130 (40 m) 355 (108 m) 390 (119 m)
FL390/.78 130 (40 m) 365 (111 m) 445 (136 m)
* On ground, the check is meaningless because the standby altimeter’s vibrator is off.
ISIS fit:
ALTITUDE TOLERANCES
- PFD 1 or 2 at ground check : plus or minus 25 feet (8 meters)
MAX IMUM DIFFERENCES BETWEEN ALTITUDE IN DICATIONS
FL/SPEED
ALTITUDE (ft) COMPARISON BETWEEN
(1) ADR 1 and ADR 2 (on PFD)
(2) ADR 3 and ADR 1, or ADR 3 and ADR 2(on PFD)
(3) ISIS and any ADR 1, or 2, or 3
GND CHECK 20 (6 m) 20 (6 m) 100 (30 m)
FL50/250 kt 50 (15 m) 65 (20 m) 130 (40 m)
FL100/250 kt 55 (17 m) 80 (24 m) 185 (56 m)
FL200/300 kt 90 (27 m) 135 (41 m) 295 (90 m)
FL300/.78 130 (40 m) 195 (59 m) 390 (119 m)
FL390/.78 130 (40 m) 195 (59 m) 445 (136 m)