this kind of bring us to the question of whether a land based J31 is still going to be produced.
1st possibility is PLAAF will just keep producing J20 at current or higher rate and skip J31, which in the end will result in over 1000 J20 by 2030, combined with ~700 J11b/J16, PLAAF will have close to 2000 dual engine heavy fightets(!), plus the 300 J10b/c, total 2300 gen4.5/gen5. The composition is heavily tilted towards long range fighters.
Second is the current dramatic ramp up in J20 is an emergency respond to the geo politic situation. They could continue to produce at cuurent rate for several years but ramp down earlier, J31 production will kick in at later in the decade, which will result in a more balanced fleet.
3rd one is gen6 fighter will kick in earlier than 2030, which will natrually result in J20 production to ramp down in 2030 and J31 skpipped. What Yang Wei mentioned during the airshow few days ago could refer to that but we never know.
IMHO, first is more likely as J31 is too late to the game and PLA planner now dont have the luxary to wait for it
J31's still fills a role in China's air force. China's modern fleet excluding planes like the J7/J8/JH7 is still relatively small compared to the US. A cheaper/smaller jet that China can mass produce is still crucial along with eventually replacing the J10 fleet.
To begin with, there are
2 major fighter class in the PLAAF:
Heavyweight fighters (those in the
30-ton-ish weight range, i.e. J-11, J-16 & J-20), and
mediumweight fighters (those in the
20-ton-ish weight range, i.e. J-10).
As
@Blitzo had previously mentioned, the PLAAF has been heavily pivoted towards heavyweight fighters, especially with their growing procurement of the J-16s and J-20s in recent years. The possible reduction or stopping in J-10's production also seems to reinforce this viewpoint.
However, even for the global-reaching USAF, they also operate a sizeable force of mediumweight fighters, i.e. F-16s, despite them having large numbers of heavy-weight fighters in service across the air force as well, i.e. F-15s and F-22s. Had it not been the expensive price tags of the F-22, the USAF could have hundreds of F-22 in service right now instead of just 180. This is considering that the
F-22s were meant to play the role of the
F-15s as
air superiority fighters, while the
F-35s were meant to play the role of the
F-16s as
multi-role fighters.
In my opinion, this shows that even when the focus and scope of operations in the PLAAF have been gradually widened over the past 2 decade
from local and national defense to regional power projection and strike capability, there is still the need for mediumweight fighters like the ones of the J-10 for
territorial and regional defense roles, which is pretty similarly to those played by the F-16.
Which means, instead of sending mediumweight fighters like the J-10s out to combat enemy forces or conduct strikes in faraway oceans or enemy territories, they would
operate closer to China and their home bases. Their main tasks would be to
fight and defend against enemy forces that are intruding and attacking targets within China's home soil and PLA's theater of operations in times of war.
Recall that the chief designer of the SAC has mentioned that there would be
4 variants for the FC-31/J-31/J-35 fighter series. I think these 4 variants could be
J-35 single-seater,
J-35 twin-seater,
J-31 single-seater and
J-31 twin-seater.
The
J-35 variants would be
exclusive for PLAN use (since there isn't any navy anywhere that aims to operate carriers on a large scale like the US and China), while the
J-31 variants would be for
land-based use.
Therefore, I believe that the PLA
would introduce J-31s into active PLAAF service, supplementing and gradually replacing the J-10s starting from the 2030s and 2040s, and eventually become the mainstay mediumweight fighters of the PLAAF. Furthermore, since SAC is aiming the FC-31 for export, having the J-31 in service with the PLAAF would definitely be beneficial for promoting the FC-31 to their foreign customers.
Meanwhile, regarding the possible slowdown or stopping of J-10 production, I believe there are 3 possible explantions:
1. The PLAAF is feeling confident enough regarding the number of J-10s in active PLAAF serivce that they don't need anymore new J-10s;
2. The PLAAF is waiting for the possible J-10D to be ready before resuming production; or
3. The possible transfer of the J-10 production line from CAC to GAC has not been completed yet, and that the need for higher J-20 production rates has eaten into the production line that were originally meant for J-10s.