8Type-1 PTSS monitoring, reporting and fault requirements#

A Type-1 PTSS monitoring, reporting and fault requirements shall comply with the requirements specified below.

8.1Type-1 Faults#

In the event of a fault, the traffic controller shall be alerted on the HRC in use with a visual and audible alert indicating the PTSU where the fault occurred.

Alerts shall be providing for the following:

• low battery alarm, shall be active for at least 60 minutes and no more than 90 minutes before PTSU shuts down
• green or yellow aspect fault, and
• critical faults.

8.1.1Type-1 Critical faults#

When a critical fault occurs:

1. a)the PTSS shall go to an all red display on all PTSUs, and
2. b)the HRC shall be unable to operate the PTSS until a self-check has been performed on all PTSUs.

The time taken to reach an all-red display where the PTSUs are inoperable depends on the state of the PTSS prior to the fault:

• Any signal head is displaying green: PTSS all-red and inoperable within 5 seconds.
• Any signal head is displaying yellow: PTSS all-red inoperable within 5-x seconds, where x is the amount of time the unit was displaying yellow before the fault occurred.
• All signal heads are displaying red: PTSS inoperable within 1 second.

In addition to Items c, d, f, g, i and j listed under Section 2.8.2 of AS 4191, critical faults shall include the following:

1. a)movement of the PTSU after installation, detected through:
2. i.monitored GPS location (where a GPS is installed) of the PTSU exceeding the installed location by 30 m
3. ii.monitored directional compass position of the PTSU exceeds installed position by +- 20° (yaw)
4. iii.monitored inclination of the PTSU exceeds installed position by ± 20° (roll or pitch).
5. b)loss of communication
6. c)red aspect fault
7. d)conflicting green signals occurring in shuttle control, and
8. e)undefined behaviour or system crash.