Revision of Class D Airspace; San Diego-Gillespie Field, CA

This action will revise the Class D airspace at San Diego- Gillespie Field, CA by lowering the ceiling of the Class D airspace area from 2,900 feet Mean Sea Level (MSL) to 2,400 feet MSL. The proposed modification of the San Diego, CA, Class B airspace area would create a narrow 300 foot corridor northeast of Gillespie Field. This corridor would reduce the available airspace for aircraft that are approaching or overflying Gillespie Field from the northeast. Lowering the Gillespie Field Class D airspace ceiling will create an 800 foot corridor along this same route, thereby increasing navigable airspace for aircraft operating under Visual Flight Rules (VFR).