N98ZZPiper PA 46-350P · 2024

On October 23, 2009, at 2017 eastern daylight time, a Piper PA 46-350P, N98ZZ, was substantially damaged when it collided with wooded terrain, during an emergency approach to Zephyrhills Municipal Airport (ZPH), Zephyrhills, Florida, following a reported loss of engine power. The certificated commercial pilot and two passengers were killed. The personal flight was conducted under the provisions of 14 Code of Federal Regulation Part 91. Visual meteorological conditions prevailed and an instrument flight rules flight plan was filed for the planned flight to Lakeland Linder Regional Airport (LAL), Lakeland, Florida. The flight departed Gainesville Regional Airport (GNV), Gainesville, Florida at 1943.

According data from the Federal Aviation Administration (FAA), at 2006, the pilot was in radar and radio contact with Tampa terminal radar approach control (TRACON). At that time, the airplane was in cruise flight at 5,000 feet mean sea level (msl). About 2 minutes later, the TRACON controller cleared the flight to descend to 3,000 feet, which the pilot acknowledged. At 2014, the controller cleared the flight to descend to 2,000 feet, and instructed the pilot to report LAL in sight. The pilot acknowledged the clearance and reported LAL in sight. The controller then cleared the flight for a visual approach to runway 27 at LAL, which the pilot acknowledged. About 30 seconds later, the pilot declared an emergency and requested assistance to the nearest airport. The controller provided a vector and distance to the nearest suitable airport, ZPH, and the pilot subsequently reported "engine out, engine out." The airplane impacted wooded terrain about 4 miles northeast of runway 22 at ZPH. A postcrash fire consumed a majority of the wreckage.

Fueling records revealed that the pilot fueled the airplane with 16.4 gallons of 100 low-lead aviation gasoline, prior to departure from GNV.

The pilot, age 44, held a commercial pilot certificate, with ratings for airplane single-engine land, airplane multiengine land, and instrument airplane. The pilot's most recent FAA second-class medical certificate was issued on September 26, 2007. The pilot's logbook was not recovered. According to an insurance application dated January 21, 2008, the pilot had a total flight experience of 2,750 hours; of which, 110 hours were in the same make and model as the accident airplane.

The pilot applied for an FAA second-class medical certificate on October 27, 2008; however, that application noted 3+ glucose in the urine and was deferred due to “possible diabetes.” On November 27, 2008, the FAA sent a written request to the pilot for a “...report from your treating physician to include a statement of any complications and a current glycosylated hemoglobin (i.e., hemoglobin A1c) test…” The FAA did not receive any further correspondence from the pilot or a treating physician and the application remained in a deferred state.

The six-seat, low-wing, retractable-gear airplane, serial number 4636169, was manufactured in 1998. It was powered by a Lycoming TIO-540, 350-horsepower engine and equipped with a three-bladed, constant-speed Hartzell propeller.

Review of the airplane's maintenance logbooks revealed that its most recent annual inspection was completed on December 9, 2008. At that time, the accident engine was installed on the airplane. The accident engine had accumulated 493.1 hours since new. The airframe had accumulated 1,910.5 hours since new.

Further review of the engine logbook revealed that it had been removed from another airplane on February 17, 2006. The engine was stored and subsequently sold to the owner of the accident airplane.

Tampa Executive Airport (VDF), Tampa, Florida, was located about 15 miles south of ZPH. The recorded weather at VDF, at 2020, was: wind calm, visibility 10 miles, sky clear, temperature 21 degrees Celsius, dew point 19 degrees Celsius, altimeter 29.90 inches of mercury.

The airplane came to rest inverted, oriented on a heading of 240 degrees magnetic. An approximate 100-foot debris path was observed, originating with tree strikes and terminating at the front of the main wreckage. The outboard left stabilizer was located near the beginning of the debris path, to the right of the path. The left wing was located next along the debris path, suspended about 10 feet in a tree along the right side of the path. The right wing was located on the left side of the main wreckage. The majority of right wing had separated near the root, and was embedded around a tree near the termination of the debris path. The right aileron and portion of right flap remained attached to the airframe.

The flaps and landing gear were retracted. The radar pod was located to the right of the main wreckage. The engine and two propeller blades were partially buried. None of the three propeller blades exhibited evidence of rotation. The cockpit and cabin area, including the fuel selector, were consumed by fire. The empennage remained partially intact and was charred. The vertical stabilizer, right horizontal stabilizer, and inboard left horizontal stabilizer remained attached and were partially consumed by fire.

Flight control continuity was confirmed from the forward cockpit area, to the elevator horn, elevator trim jackscrew, and rudder horn, respectively. Continuity was also confirmed from the left and right ailerons, to cable separations near the left and right wing roots, respectively. Measurement of the elevator trim jackscrew revealed eight exposed threads, which equated to an approximate neutral trim setting.

The wreckage was recovered to a hangar on October 24, 2009. The ignition system and fuel system were consumed by fire. A cursory examination of the engine, which included a borescope inspection of the cylinders, did not reveal any preimpact mechanical malfunction. The three-bladed propeller remained attached to the engine and two of the blades were partially consumed by fire. The remaining blade exhibited minor damage. The engine was retained for further teardown examination.

An autopsy was performed on the pilot by the State of Florida District Six Medical Examiner’s Office, Largo, Florida, on October 25, 2009. The autopsy report noted the cause of death as "thermal injuries."

Toxicological testing was performed on the pilot by the FAA Bioaeronautical Science Research Laboratory, Oklahoma City, Oklahoma. Review of the toxicology report revealed:

" 845 (mg/dl ) GLUCOSE detected in Urine

6.3 (%) HEMOGLOBIN A1C detected in Blood"

A teardown examination of the engine was performed at the manufacturer's facility, under the supervision of an NTSB investigator, on January 12 and 13, 2010. The examination did not reveal any evidence of catastrophic failure; however, the fuel system and ignition system could not be tested due to the postcrash fire damage. During the teardown examination, three teeth were observed separated from the propeller governor drive gear. The gear and teeth were subsequently forwarded to the NTSB Materials Laboratory, Washington, DC.

Further examination of the propeller governor drive gear and teeth revealed that the three teeth separated consistent with overstress. No additional damage or malfunction was noted with the gear, which was consistent with the separation occurring during impact or recovery of the wreckage.