Cat C LWTR Question - A/C fire bottles

[KwikPhix]

got asked a MCQ at glasgow today that went something like this:
When servicing a Nitrogen fire bottle at 15 deg C what pressure should you charge it to (or words to that effect)

a) 600 psi +- 25psi
b)1250 psi +- 25 psi
C)1500 psi +- 25 psi

Could somebody please enlighten me as i have never worked on an Aircraft that has Nitrogen fire bottles. CO 2, BCF, Methel Bromide, yes but never N2. I would also think by the wording of the Q that this is an industry standard to give such precise pressures. Surely the pressures would be as stated in the AMM or CMM (or even dare i say it as stated on the bottle) not some figure that one is expected to remember. Any views or comments out there?

[100LL]

Cant find owt in Caa publications but i found a graph in Jeppersen A+P Aiframe tech hand book and judging by that i would Charge it to 600 +/-25 Psig. But what do the Faa know our beloved Caa KNOW everything.
The main disadvantage of N2 is that it must be stored as a cryogenic liquid. Would have thought it would be weighed.

[ 07 September 2001: Message edited by: 100LL ]

[gaterbait]

if it were up to me i'd use the acft mm & screw the rest