This is a rare sound effect that is not available on the Hanna-Barbera Sound Effects Library, It's a higher-pitched version of H-B CARTOON, AIRPLANE - PROP PLANE DIVE AND SWOOP BY 01, version of Sound Ideas, AIRPLANE, PROP - TWO PLANES DIVE It's a Clearly Version With Mostly a CRASH, CARTOON - KEN'S BASS, DRUM AND CYMBAL CRASH, MUSIC, PERCUSSION, mixed with a wood crash sound.