DATA CORRESPONDANCE BETWEEN AUTOMATICALLY REPORTED PRESSURE
ALTITUDE DATA AND PILOT'S ALTITUDE REFERENCE.
person may operate any automatic pressure altitude reporting
equipment associated with a radar beacon transponder--
(a) When deactivation of that equipment is directed by
Unless, as installed, that equipment was tested and calibrated
to transmit altitude data corresponding within 125 feet
(on a 95 percent probability basis) of the indicated or
calibrated datum of the altimeter normally used to maintain
flight altitude, with that altimeter referenced to 29.92
inches of mercury for altitudes from sea level to the
maximum operating altitude of the aircraft; or
Unless the altimeters and digitizers in that equipment
meet the standards of TSO-C10b and TSO-C88, respectively.