Model Variants (Including Prototypes)
EC-137D - Two Examples Prototype AWACS; fitting JT3D series engines; first prototype fitting Westinghouse-brand radar system whilst second prototype fitting Hughes-brand radar system; later converted to E-3A standard and fitting TF33 series engines.
E-3A - Initial Production Model Designation; fitted with TF33 engines; AN/APY-1 series radar system; 25 examples produced for USAF (later converted to E-3B standard); 18 examples produced for NATO usage fitting TF33 series engines; 5 examples produced for Saudi Arabia fitting CFM56 engines.
E-3B - Based on E-3A models but featuring improvements; 24 conversion examples.
E-3C - Fitted with AN/APY-2 radar system; system improvements throughout; 9 examples produced.
JE-3C - One-Off Trials Aircraft utilized by Boeing; later becoming an E-3C.
E-3D - British production E-3C model; fitted with CFM56 engines; 7 examples produced.
E-3F - French production E-3C model; fitted with CFM56 engines; 4 examples produced.
E-3G - Block 40/45 modification; Airframe Modernization Program (AMP); USAF usage.
KE-3A - Saudi Arabian tankers fitted with CFM56 engines; 8 examples produced.
Sentry AEW.1 - British Designation of E-3D model.