19VOR systems — periodic checking

19 VOR systems — periodic checking

19.1This clause applies only for the following navigation systems (the relevant systems) of an Australian aircraft engaged in I.F.R. flight for which the holder of the certificate of registration has elected to use the CASA maintenance schedule:

(a) all VOR systems;

(b) all localiser systems;

(c) all glideslope systems.

19.2Check and ensure that the level of interference between the relevant systems, and any combination of other aircraft systems normally operated in flight, is not of a level sufficient to cause either of the following:

(a) a significant deflection of the flight path indicator when the flag is concealed;

(b) any degradation of the readability of the station identification.

19.3For subclause 19.2, a level of interference which is merely intermittent or short-term may be ignored, but only if it does not cause the deflection or degradation mentioned in paragraphs 19.2 (a) and (b).

19.4Check and ensure that the level of interference from any source, intermittent, short‑term or otherwise, is not of a level sufficient to cause the flag to indicate usability in the absence of a usable signal.

19.5The checks mentioned in this clause must be carried out each time a periodic inspection is carried out in accordance with paragraphs 2.4 and 2.5 in Part 2 of Schedule 5 of CAR.