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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 types
  • Each AACI is defined by its "ID" (its API value), and is arbitrary (see the below table).
    • They are then mostly referred to by their "ID".
    • Some older AACI may be referred to by their abbreviation, such as BBR for AACI 5.
  • For all AACI, the "ID" therefore fully determines:
    • The setup of the AACI and the ships able to trigger it,
    • The "Trigger Rate" and the "Priority Order",
    • The "K-value" and "shot down per slot" value,


AACI effects
  • 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 ("shot down per slot").

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


AACI triggering
  • Only one AACI can be performed per battle,
  • Only a ship equipped with proper AACI setups can trigger one (see the below table),
  • If multiple ships are equipped with AACI setups, each ship will roll their available AACI in ID's "Priority Order" (see the below table).
    • If IDs are tied, priority goes by fleet order from top to bottom.
    • 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 ID's "Priority Order".
  • The trigger rate is unaffected by Stats like the damage status, Fleet AA, Ship AA, Adjusted AA, Air State, or any other parameter like Luck and LoS.
  • It is possible for all AACI rolls in a fleet to fail, triggering no 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].


For the following table:

Do note that some setups also required a maximal or minimal base Anti-Air AA stat for the equipment to be counted.

AACI Patterns
ID Priority
Order
Setup Shot down
per slot
K-value Rate Users
None Triggers if no other AACI is activated +1A = 1, B = 0 1.0 N/A Player's fleet only
1 11 High-Angle Gun High-Angle Gun RADAR +8A = 3, B = 5 1.7 65% Akizuki-class
2 16 High-Angle Gun RADAR +7A = 3, B = 4 1.7 58%
3 26 High-Angle Gun High-Angle Gun +5A = 2, B = 3 1.6 50%
4 15 Large Caliber Main Gun Anti-Aircraft Shell Anti-Aircraft Fire DirectorAir RADARAir +7A = 5, B = 2 1.5 52% All
5 27 High-Angle Gun8+ AA High-Angle Gun8+ AA Air RADARAir +5A = 2, B = 3 1.5 55% All
(except Akizuki-class)
6 28 Large Caliber Main Gun Anti-Aircraft Shell Anti-Aircraft Fire Director +5A = 4, B = 1 1.45 40% All
7 36 High-Angle Gun Anti-Aircraft Fire Director Air RADARAir +4A = 2, B = 2 1.35 45% All
(except Akizuki-class)
8 33 High-Angle Gun8+ AA Air RADARAir +5A = 2, B = 3 1.4 50%
9 45 High-Angle Gun Anti-Aircraft Fire Director +3A = 1, B = 2 1.3 40% All
10 6 High-Angle Gun Anti-Aircraft Gun9+ AA Air RADARAir +9A = 3, B = 6 1.65 60% Maya Kai NiMaya Kai Ni
11 9 High-Angle Gun Anti-Aircraft Gun9+ AA +7A = 2, B = 5 1.5 55%
12 40 Anti-Aircraft Gun9+ AA Anti-Aircraft Gun3+ AA Air RADARAir +4A = 1, B = 3 1.25 45% All
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)
14 25 High-Angle Gun Anti-Aircraft Gun Air RADARAir +5 1.45 62% Isuzu Kai NiIsuzu Kai Ni
15 35 High-Angle Gun Anti-Aircraft Gun +4 1.3 55%
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
)
17 42 High-Angle Gun Anti-Aircraft Gun +3 1.25 55% Kasumi Kai Ni BKasumi Kai Ni B
18 43 Anti-Aircraft Gun9+ AA +3 1.2 60% Satsuki Kai NiSatsuki Kai Ni
19 21 High-Angle Gun7- AA Anti-Aircraft Gun9+ AA +6 1.45 58% Kinu Kai NiKinu Kai Ni
20 37 Anti-Aircraft Gun9+ AA +4 1.25 65%
21 22 High-Angle Gun Air RADARAir +6 1.45 60% Yura Kai NiYura Kai Ni
22 44 Anti-Aircraft Gun9+ AA +3 1.2 60% Fumizuki Kai NiFumizuki Kai Ni
23 46 Anti-Aircraft Gun3~8 AA +2 1.05 80% UIT-25/I-504UIT-25
I-504
24 38 High-Angle Gun Anti-Aircraft Gun3~8 AA +4 1.25 40% Tenryuu-class Kai NiTenryuu Kai Ni
Tatsuta Kai Ni
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
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
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% Ooyodo KaiOoyodo Kai
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
29 23 High-Angle Gun Air RADARAir +6 1.55 60% Hamakaze B KaiHamakaze B Kai &
Isokaze B KaiIsokaze B Kai
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
31 41 High-Angle Gun High-Angle Gun +3 1.2 52% Tenryuu Kai NiTenryuu Kai Ni
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
33 31 High-Angle Gun Anti-Aircraft Gun4+ AA +4 1.35 45% Gotland Kai/AndraGotland Kai
Gotland Andra
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
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%
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%
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%
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
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%
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%
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%
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 64% Yamato-class Kai NiYamato Kai Ni
Yamato Kai Ni Juu
Musashi Kai Ni
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 59%
44 13 Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Very Large RADARSp Anti-Aircraft Gun6+ AA +7 1.6 54%
45 20 Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.png Very Large RADARSp +6 1.55 40%
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 50% Haruna Kai Ni BHaruna Kai Ni B
Examples
  • Akizuki with High-Angle Gun8+ AAHigh-Angle Gun8+ AAAir RADARAirAnti-Aircraft Gun fulfills the requirements of the AACIs with ID 1, 2, 3, 13 (in this order).
    • The resulting trigger rate is 95.22%.
  • Fletcher with Equipment Card 5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37.pngEquipment Card 5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37.pngEquipment Card 5inch Single Gun Mount Mk.30 Kai.pngAnti-Aircraft Fire Director fulfills 34, 35, 8, 9 (in this order).
    • The resulting trigger rate is 93.93%.
  • Musashi with Equipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.pngEquipment Card 10cm Twin High-angle Gun Mount Battery Concentrated Deployment.pngEquipment Card 12cm 30-tube Rocket Launcher Kai 2.pngVery Large RADARSp fulfills 42, 43, 44, 45, 5, 28, 8, 13 (in this order)
    • The resulting trigger rate is 99.73%.
  • Isokaze B Kai with High-Angle Gun8+ AAHigh-Angle Gun8+ AAAir RADARAirAnti-Aircraft Gun fulfills 29, 5, 8, 13 (in this order)
    • The resulting trigger rate is 94.15%.


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]