RT-2087/ZPX-A User and Installation Guide
UAV-1005667-001 Rev A
ECCN 7A994
Page 14 | 48
5.8 Continued Airworthiness
Maintenance of the ZPX-A is "on condition" only.
Periodic regulatory function checks of the transponder and altitude encoder
must be performed. Every 24 months, or after any maintenance is
performed where data correspondence error could be introduced:
1. The transponder must be tested, inspected, and found to comply with
the requirements of 14 CFR Part 91.413, as described in 14 CFR 43
Appendix F.
2. The internal altitude source must be tested to ensure correspondence
to the primary flight altimeter (if used and applicable), as described in
AC 43-6D and 14 CFR 43 Appendix E, to meet the maintenance
requirements of 14 CFR Part 91.411. If the altitude encoder
demonstrates correspondence errors in excess of ±125 feet, then
calibration as described in Section 10.5 must be performed. If the
error cannot be corrected using the calibration procedure, the unit
must be repaired or replaced.
Annually, confirm the ADS-B software version is current per Service
Bulletins available at the
The aircraft must be returned to service in a means acceptable to the
appropriate aviation authority.
Note:
Transponders certified after January 1, 2020 must not respond
to ATCRBS/Mode S All-Calls (Long P4 interrogation). This may
lead to unexpected results with some transponder test sets.
Note:
Mode S transponders must respond to Mode S Only All- Calls
only when airborne. ZPX-A can be placed in an airborne state
for test purposes by entering “Ground Test Mode” using the
“ping200X Control & Config” Windows application, or by using
certain compatible control heads. For more detail see Section
10.3.
