

1. The AH-64E sounds slightly more refined, a bit less "agricultural" than the Apache AH1.
2. Open panels. The AH-64E has a primer/undercoat that has more of a blue-ish hue compared to the yellowish colour of Apache AH1.
3. Navigation lights. The AH-64E lights are brighter, and the green starboard light is more blue-green compared to the green of Apache AH1.
4. Super-sized serial number on the fin of AH-64E.
5. Super-sized "ARMY" titles on the side of AH-64E.
6. Distinctive "egg-whisk" SatCom antennae on the boom of AH-64E, aft of the engines.
7. Additional large V/UHF aerial fitted above the right hand engine of AH-64E.
8. 2 distinct vertical black fan blade warning lines on the engines of AH-64E.
There are numerous other smaller differences too, but the ones listed here are the most obvious.