@Deino, is that a serial number on the intake?
Well, if only I knew!
Since a few months additionally to the individual aircraft or bort numbers (here no. 31) and the typical construction numbers PLAN Naval Aviation aircraft and helicopters were seen carrying some new serial numbers according to a HXXXXxxx or HXXXXXxx pattern.
Even if I do not fully understand the system, at least xxx or xx correlates to the bort number and for the XXXX or XXXXX I suspect some sort of unit designation. Seen so far on PLAN NA J-15, JL-9H, JH-7A, Z-8C, Z-9D and KQ-200 ... but there are surely more and so a pattern.
More here: