FOR...
RG.58 cable was indeed an aviation industry standard for many years and may well be present on this aircraft depending on its age. It's use was phased out about 10 years ago when it was realised that the dielectric (pvc) would give off noxious fumes in the event of a fire. It's also a bitch to work with for soldered connectors.
In my last job we removed all RG58 from our fleet and replaced it with either RG.142 or RG.400 depending on the application. Generally speaking both RG142 and RG400 can use the same type of BNC, TNC, N, and C connectors as the old RG58.
As I recall RG.400 can be used for most applications up 1030/1090 Mhz.
Beyond this RG393 is the cable of choice. But RG.393 is a replacement for RG213 / RG214 which was outlawed at the same time and for the same reasons as RG.58.
RG.400 is double screened and proved to be very good at system noise reduction and inter system interference where RF cables for different systems are run close together. Insertion loss is also substantially less than an equal length of RG.58
pp