Incident Overview
A Cessna 182 and a Grumman F6F-5 collided in flight on the downwind leg of the airport traffic pattern for runway 19. The Cessna was departing on runway 19 with a left climbing turnout northbound, while the Grumman F6F-5 warbird was returning to land and had entered the airport traffic area from the north. The collision occurred about midfield on the left downwind leg for runway 19 when the Grumman overtook the climbing Cessna.
Pilot Actions and Communication
The Grumman pilot was monitoring the Unicom frequency and reported several miles from the airport inbound for the overhead approach to runway 19. He overheard other aircraft in the pattern and decided to follow an F-86 warbird that was turning base to final for an overhead approach. He flew over the runway centerline about 600 feet above ground level. Near the departure end of the runway he looked left to see if there was any traffic on the downwind leg. No traffic was observed so he announced that he was in the left break for downwind and turned left to the downwind leg and climbed to the pattern altitude. At pattern altitude he was abeam the departure end of the runway. He located his reported traffic in the pattern; one was on final, one on base, and the F-86 was on his right on a wide downwind and ahead of him. He chose to follow the F-86. About midfield, while straight and level on the downwind leg, the pilot started the Before Landing Check List. During that procedure he checked his position relative to the runway. At that instant, another aircraft came into view from below and ahead of him and the collision occurred.
Collision and Damage
The left wing of the Grumman impacted at the base of the rudder and vertical stabilizer of the Cessna, severing it from the airplane. The Grumman pilot transmitted the collision information and subsequently landed with substantial damage to the left wing.
Airport and Radio Information
The uncontrolled airport was sponsoring an Air Expo, which consisted of static and aerial formation flights, flybys, and parachuting events. The airport routinely provides an aeronautical advisory station (CTAF) on 122.725 MHz, and provides wind and preferred runway information. The CTAF operator at the airport did not recall hearing the Cessna on frequency. Visual examination of the Cessna's two damaged communication radios with only 25 kHz frequency spacing revealed the top radio was selected to 122.7 MHz, and the other was 121.902 MHz. The Grumman airplane had one radio with 25 kHz frequency spacing; however, the pilot was using a handheld VHF radio for transmissions on 75 kHz spacing for the airport's CTAF frequency, 122.725 MHz.