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Anti-Air Cut-in

Akizuki performing the ID 1 AACI.

Using special equipment setups, ships may perform one of multiple special Anti-Ait Cut-In mostly referred to as AACI, during Stage 2.

  • AACI are mostly referred to by their "ID" (see the below table).
  • Some older AACI may be referred to by their abbreviation, such as BBR for AACI 5.

AACI will:

  • Grant a multiplier to the "Fixed Shootdown" of all allied ships, referred to as the K-value, regardless of what ship triggers it,
  • Remove a fixed number of planes from each enemy bomber slot.

These effects make depleting the entirety of enemy planes much more feasible.

Even is multiple ships are equipped with proper AACI setups, only one ship can perform an AACI per battle.

  • The ship who triggers the AACI will depend on the AACI ID in use, followed by the trigger rolls, thus, for a given fleet & setup, some ships will take priority over others always the same way.
  • If one ship fulfills the requirement for multiple setups at once, then it will be able to roll each individual AACI in "Priority Order" (see the below table).
  • It is possible for all AACI rolls in a fleet to fail, triggering no AACI.
  • If Stage 2 happens multiple times, like in an Air Battle node, then each Air Phase's Stage 2 might roll an AACI.

If the enemy fleet has a valid setup, it may as well activate an AACI. If that happens, no animation will be shown, but the effects will function normally.

  • It can activate during the regular airstrike phase, but not during other phases like the Jet Assaults, LBAS phases, OASW, or Shelling phases.
  • There is a bug that allows enemy ships to activate AACI even if they were sunk[1].

The trigger chance of a given AACI is solely determined by its ID (its API value), and is arbitrary. Fleet AA, Ship AA, Adjusted AA, Air State, or any other parameter like Luck and LoS have no bearing in AACI trigger rates. Most trigger chances were datamined from KanColle Vita, and tests in the Browser version corroborated the results.

AACI Table

AACI Patterns
ID Priority
Order
Type Shot down
per slot
K-value Rate Users Notes
None - +1A = 1, B = 0 1.0 N/A Player's fleet only Triggers if no other AACI is activated
1 11 High-Angle Gun High-Angle Gun RADAR +8A = 3, B = 5 1.7 65% Akizuki-class HA Gun x2 + Radar
2 16 High-Angle Gun RADAR +7A = 3, B = 4 1.7 58% HA Gun + Radar
3 26 High-Angle Gun High-Angle Gun +5A = 2, B = 3 1.6 50% HA Gun x2
4 15 Large Caliber Main Gun Anti-Aircraft Shell Anti-Aircraft Fire DirectorAir RADARAir +7A = 5, B = 2 1.5 52% All Large Main Gun + AA Shell + AAFD + Air Radar
5 27 High-Angle Gun8+ AA High-Angle Gun8+ AA Air RADARAir +5A = 2, B = 3 1.5 55% All
(except Akizuki-class)
HA Gun (≥8 AA) x2 + Air Radar
6 28 Large Caliber Main Gun Anti-Aircraft Shell Anti-Aircraft Fire Director +5A = 4, B = 1 1.45 40% All Large Main Gun + AA Shell + AAFD
7 36 High-Angle Gun Anti-Aircraft Fire Director Air RADARAir +4A = 2, B = 2 1.35 45% All
(except Akizuki-class)
HA Gun + AAFD + Air Radar
8 33 High-Angle Gun8+ AA Air RADARAir +5A = 2, B = 3 1.4 50% HA Gun (≥8 AA) + Air Radar
9 45 High-Angle Gun Anti-Aircraft Fire Director +3A = 1, B = 2 1.3 40% All HA Gun + AAFD
10 6 High-Angle Gun Anti-Aircraft Gun9+ AA Air RADARAir +9A = 3, B = 6 1.65 60% Maya Kai NiMaya Kai Ni HA Gun + AA Gun (≥9 AA) + Air Radar
11 9 High-Angle Gun Anti-Aircraft Gun9+ AA +7A = 2, B = 5 1.5 55% HA Gun + AA Gun (≥9 AA)
12 40 Anti-Aircraft Gun9+ AA Anti-Aircraft Gun3+ AA Air RADARAir +4A = 1, B = 3 1.25 45% All AA Gun (≥9 AA) + AA Gun (≥3 AA) + Air Radar
13 34 High-Angle Gun8+ AA Anti-Aircraft Gun9+ AA Air RADARAir +5A = 1, B = 4 1.35 35% All
(except Maya Kai NiMaya Kai Ni)
HA Gun (≥8 AA) + AA Gun (≥9 AA) + Air Radar
14 25 High-Angle Gun Anti-Aircraft Gun Air RADARAir +5 1.45 62% Isuzu Kai NiIsuzu Kai Ni HA Gun + AA Gun + Air Radar
15 35 High-Angle Gun Anti-Aircraft Gun +4 1.3 55% HA Gun + AA Gun
16 24 High-Angle Gun Anti-Aircraft Gun Air RADARAir +5 1.4 62% Kasumi Kai Ni BKasumi Kai Ni B &
Yuubari Kai NiYuubari Kai Ni (not Toku/DYuubari Kai Ni Toku
Yuubari Kai Ni D
)
HA guns + AA Gun + Air Radar
17 42 High-Angle Gun Anti-Aircraft Gun +3 1.25 55% Kasumi Kai Ni BKasumi Kai Ni B HA Gun + AA Gun
18 43 Anti-Aircraft Gun9+ AA +3 1.2 60% Satsuki Kai NiSatsuki Kai Ni AA Gun (≥9 AA)
19 21 High-Angle Gun7- AA Anti-Aircraft Gun9+ AA +6 1.45 58% Kinu Kai NiKinu Kai Ni HA Gun (≤7 AA) + AA Gun (≥9 AA)
20 37 Anti-Aircraft Gun9+ AA +4 1.25 65% AA Gun (≥9 AA)
21 22 High-Angle Gun Air RADARAir +6 1.45 60% Yura Kai NiYura Kai Ni HA Gun + Air Radar
22 44 Anti-Aircraft Gun9+ AA +3 1.2 60% Fumizuki Kai NiFumizuki Kai Ni AA Gun (≥9 AA)
23 46 Anti-Aircraft Gun3~8 AA +2 1.05 80% UIT-25/I-504UIT-25
I-504
AA Gun (3 to 8 AA)
24 38 High-Angle Gun Anti-Aircraft Gun3~8 AA +4 1.25 40% Tenryuu-class Kai NiTenryuu Kai Ni
Tatsuta Kai Ni
HA Gun + AA Gun (3 to 8 AA)
25 10 Equipment Card 12cm 30-tube Rocket Launcher Kai 2.png Air RADARAir Anti-Aircraft Shell +8 1.55 60% Ise-class Kai/NiIse Kai
Ise Kai Ni
Hyuuga Kai
Hyuuga Kai Ni
RLK212cm 30-tube Rocket Launcher Kai Ni + Air Radar + AA Shell
26 14 Equipment Card 10cm Twin High-angle Gun Mount Kai + Additional Machine Guns.png Air RADARAir +7 1.4 55% Yamato-class Kai NiYamato Kai Ni
Yamato Kai Ni Juu
Musashi Kai Ni
10cm Twin HA Mount Kai10cm Twin High-angle Gun Mount Kai + Additional Machine Guns + Air Radar
27 19 Equipment Card 10cm Twin High-angle Gun Mount Kai + Additional Machine Guns.png Equipment Card 12cm 30-tube Rocket Launcher Kai 2.png Air RADARAir +6 1.55 55% (5%)when accounting for ID 8 rate Ooyodo KaiOoyodo Kai 10cm Twin HA Mount Kai10cm Twin High-angle Gun Mount Kai + Additional Machine Guns + RLK212cm 30-tube Rocket Launcher Kai Ni + Air Radar
28 29 Equipment Card 12cm 30-tube Rocket Launcher Kai 2.png Air RADARAir +5 1.4 55% Ise-class Kai/NiIse Kai
Ise Kai Ni
Hyuuga Kai
Hyuuga Kai Ni
&
Musashi Kai/NiMusashi Kai
Musashi Kai Ni
RLK212cm 30-tube Rocket Launcher Kai Ni + Air Radar
29 23 High-Angle Gun Air RADARAir +6 1.55 60% Hamakaze B KaiHamakaze B Kai &
Isokaze B KaiIsokaze B Kai
HA Gun + Air Radar
30 32 High-Angle Gun High-Angle Gun High-Angle Gun +4 1.3 45% Tenryuu Kai NiTenryuu Kai Ni &
Gotland Kai/AndraGotland Kai
Gotland Andra
HA Gun x3
31 41 High-Angle Gun High-Angle Gun +3 1.2 52% Tenryuu Kai NiTenryuu Kai Ni HA Gun x2
32 39 Equipment Card 16inch Mk.I Triple Gun Mount Kai + FCR Type 284.png Equipment Card QF 2-pounder Octuple Pom-pom Gun Mount.png
OR
Equipment Card 20-tube 7inch UP Rocket Launchers.png Equipment Card QF 2-pounder Octuple Pom-pom Gun Mount.png
OR
Equipment Card 20-tube 7inch UP Rocket Launchers.png Equipment Card 20-tube 7inch UP Rocket Launchers.png
+4 1.2 50% Royal Navy Ships &
Kongou-class Kai Ni/B/C
16inch Mk.I Triple + FCR16inch Mk.I Triple Gun Mount Kai + FCR Type 284 + QF 2-pounderQF 2-pounder Octuple Pom-pom Gun Mount
OR
20-tube 7inch UP20-tube 7inch UP Rocket Launchers + 20-tube 7inch UP20-tube 7inch UP Rocket Launchers / QF 2-pounderQF 2-pounder Octuple Pom-pom Gun Mount
33 31 High-Angle Gun Anti-Aircraft Gun4+ AA +4 1.35 45% Gotland Kai/AndraGotland Kai
Gotland Andra
HA Gun + AA Gun (≥4 AA)
34 12 Equipment Card 5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37.png Equipment Card 5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37.png +8 1.6 55% Fletcher-class 2 5inch Mk.30 + GFCS Mk.375inch Single Gun Mount Mk.30 Kai + GFCS Mk.37
35 17 Equipment Card 5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37.png Equipment Card 5inch Single Gun Mount Mk.30.png
OR
Equipment Card 5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37.png Equipment Card 5inch Single Gun Mount Mk.30 Kai.png
+7 1.55 55% 5inch Mk.30 + GFCS Mk.375inch Single Gun Mount Mk.30 Kai + GFCS Mk.37 + 5inch Single Gun Mount Mk.305inch Single Gun Mount Mk.30 / Kai5inch Single Gun Mount Mk.30 Kai
36 37 Equipment Card 5inch Single Gun Mount Mk.30.png Equipment Card 5inch Single Gun Mount Mk.30.png Equipment Card GFCS Mk.37.png
OR
Equipment Card 5inch Single Gun Mount Mk.30 Kai.png Equipment Card 5inch Single Gun Mount Mk.30.png Equipment Card GFCS Mk.37.png
OR
Equipment Card 5inch Single Gun Mount Mk.30 Kai.png Equipment Card 5inch Single Gun Mount Mk.30 Kai.png Equipment Card GFCS Mk.37.png
+7 1.55 50% 2 5inch Single Gun Mount Mk.305inch Single Gun Mount Mk.30 / Kai5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37GFCS Mk.37
37 30 Equipment Card 5inch Single Gun Mount Mk.30 Kai.png Equipment Card 5inch Single Gun Mount Mk.30 Kai.png +5 1.45 40% 2 5inch Single Gun Mount Mk.30 Kai5inch Single Gun Mount Mk.30 Kai (not base)
38 1 Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png +11 1.85 57% Atlanta-classAtlanta 2 GFCS Mk.37 + 5inch Twin CDGFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)
39 2 Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png +11 1.7 57% GFCS Mk.37 + 5inch Twin CDGFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment) + 5inch Twin CD5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)
40 3 Equipment Card 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card GFCS Mk.37.png
OR
Equipment Card 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card GFCS Mk.37.png
OR
Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card GFCS Mk.37.png
+11 1.7 56% 2 5inch Twin CD5inch Twin Dual-purpose Gun Mount (Concentrated Deployment) / GFCS Mk.37 + 5inch Twin CDGFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment) + GFCS Mk.37GFCS Mk.37
41 5 Equipment Card 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png
OR
Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png
OR
Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png Equipment Card GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment).png
+10 1.65 55% 2 5inch Twin CD5inch Twin Dual-purpose Gun Mount (Concentrated Deployment) / GFCS Mk.37 + 5inch Twin CDGFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)
42 4 Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Very Large RADARSp Anti-Aircraft Gun6+ AA +11 1.65 ?% Yamato-class Kai NiYamato Kai Ni
Yamato Kai Ni Juu
Musashi Kai Ni
Very large radar15m Duplex Rangefinder + Type 21 Radar Kai Ni
15m Duplex Rangefinder Kai + Type 21 Radar Kai Ni + Skilled Fire Direction Center
+ 1 or 2 10cm Twin HA Gun CD10cm Twin High-angle Gun Mount Battery Concentrated Deployment + 0 or 1 AA Gun (≥6 AA)
43 7 Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Very Large RADARSp +9 1.6 ?%
44 13 Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Very Large RADARSp Anti-Aircraft Gun6+ AA +7 1.6 ?%
45 20 Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Very Large RADARSp +6 1.55 ?%
46 8 Equipment Card 35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage).png Anti-Aircraft Gun9+ AA Air RADARAir
OR
Equipment Card 35.6cm Twin Gun Mount Kai 4.png Anti-Aircraft Gun9+ AA Air RADARAir
8 1.55 49.5% Haruna Kai Ni BHaruna Kai Ni B 35.6cm Twin K3 (Dazzle)35.6cm Twin Gun Mount Kai San (Dazzle Camouflage) / 35.6cm Twin K435.6cm Twin Gun Mount Kai Yon + AA Gun (≥9 AA) + Air Radar

oui²

Notes
  • If multiple ships can trigger AACI, the ship that rolls the highest ID number takes priority.
    • If ID numbers are tied, priority goes by fleet slot order from top to bottom.
  • If a single ship fulfills multiple AACI requirements:
    • A single roll is done to check for all AACIs.
    • This means that an AACI with higher priority and higher trigger rate completely blocks lower priority AACI from activating.
      • For example, Akizuki with a High-Angle Gun8+ AAHigh-Angle Gun8+ AAAir RADARAir setup fulfills the requirements of the AACIs with ID 1, 2, 3, 5, and 8, with 1 being the highest priority. Due to this, the only ID that Akizuki can trigger is 1, because a success will activate it, and a failure implies that the roll wouldn't meet the 58%, 50%, 55%, and 50% trigger rates as it has failed to meet a 65% rate roll.
    • Conversely, an AACI with lower priority but higher trigger rate has a chance of occurring, if the roll fails to pass the higher priority AACI.
      • For example, Isokaze B Kai with High-Angle Gun8+ AAHigh-Angle Gun8+ AAAir RADARAir fulfils 5 (55% rate) and 29 (60% rate), with 5 having priority. This means that in total, 5 will occur 55% of the time, and 29 will occur the leftover 5% of the time (60% - 55%).
    • Priority is: (1 > 2 > 3, 10 > 11, 14 > 15, 16 > 17, 19, 21, 25, 42 > 43 > 44 > 45) > 4 > 5 > 6 > 8 > 7 > (26 > 27 > 28, 29) > 9 > (33) > 12 > 13 > (18, 20, 22, 23, 30 > 31 > 24, 32)[2][3]
      • Examples:
        • Kinu Kai Ni can trigger both ID 20 and 19.
        • The same ship can activate IDs 20, 5, and 29.
      • Note: At some point during 2018-2019(?), priority was changed from 7 > 8 to 8 > 7. Prior to this, both 7 and 8 could be triggered with High-Angle Gun8+ AAAnti-Aircraft Fire DirectorAir RADARAir[4], whereas now only 8 can be triggered.


Sequential AACIs

The Sequential AACIs were the AACIs introduced with the implementation of Johnston, allowing to a single ship to roll multiple AACI IDs at once, greatly increasing the trigger rate. Since the 26/05/2023 update, this mechanic is defunct, being available to all ships.

  • See here for more details.


Main Sources: [1] [2]