Radar warning receiver
A Radar Warning Receiver (RWR) is a system that informs the pilot about incoming radar radiation. In game the RWR is a clock display that shows the type of threat (detected by radar or tracked by radar) and its direction.
If a radar is sending a single "ping" at you (a search radar is detecting you), the RWR will sound a short warning and show the direction it is coming from. RWR can show multiple pings at once from different directions and sources. If you hear a constant alarm and see a striped line coming from the ping towards the center of the RWR, a tracking radar has locked you and is constantly tracking your position (which usually precedes a missile launch).
Some helicopter RWR sets in-game have what's known as MAW (Missile Approach Warning), which warns the user about a missile launch that's heading directly to the user's vehicle. A few of these helicopters have the ability to automatically drop countermeasures when a MAW warning is active.
In Update "La Royale", soviet aircraft got a slightly different RWR with non-precise sectors which indicate the approximate location of the ping or lock.
List of planes with a Radar Warning Receiver in game
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VI Rank
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 A-4E Early   F-104C  F-105D  F-100D  F-4C Phantom II  F8U-2  AV-8C   A-10A  F-5C  F-5A  |
◌Hunter F.58  ◄MiG-21 SPS-K  |
Su-7B  Su-7BKL  Su-25  Su-25K  MiG-21S (R-13-300)  |
Buccaneer S.2  |
A-5C  |
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VII Rank
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F-5E  F-4E Phantom II  F-8E  A-10A Late  A-6E TRAM  F-4J Phantom II  A-7D  F-4S Phantom II  A-7E  |
◄F-4F Early  ◊MiG-23MF  ◊MiG-21 "Lazur-M"  |
MiG-21SMT  Su-17M2  Su-22M3  Su-25T  Su-39  MiG-23ML  |
F-4J(UK) Phantom II  Sea Harrier FRS.1  |
F-4EJ ADTW  F-4EJ Phantom II  |
J-7D  |
▄F-104S TAF  |
Mirage F1C-200  |
Saab J35XS  |
Kfir C.2  Kfir Canard 
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VIII Rank
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F-14A Early  F-14B  F-16A  F-16A ADF  |
◄Tornado IDS MFG  |
MiG-23MLD  MiG-27K  MiG-29  Yak-141  |
Harrier GR.7  Tornado F.3  Tornado GR.1  |
F-4EJ Kai Phantom II  F-16AJ  |
␗F-16A MLU  |
▄F-16A ADF  ▄Tornado IDS (1995)  |
Mirage 2000C-S5  Mirage 2000D-R1  |
JA37D  |
Kurnass 2000  Netz  |
