N127CA

HISTORY OF FLIGHT

On December 12, 2001, approximately 2231 central standard time, a Piper PA-23-250 twin-engine airplane, N127CA, operating as Swiftwing 200, struck power lines and terrain at the Duncan/Halliburton Field (DUC) near Duncan, Oklahoma, during a localizer (LOC) approach. The airplane was operated by Safewing Aviation Company, Inc., of Kansas City, Missouri, and was registered to Delta Sales Company of Davenport, Iowa. The positioning flight, which was operating under 14 Code of Federal Regulations (CFR) Part 91, departed Wiley Post Airport (PWA), Oklahoma City, Oklahoma, about 2130 with a destination of DUC. The instrument rated commercial pilot received serious injuries, and the airplane sustained substantial damage. Night instrument meteorological conditions prevailed for the flight, and an instrument flight rules (IFR) flight plan was filed with PWA as the alternate.

Prior to the flight, the pilot called the McAlester Automated Flight Service Station (AFSS) at 2126:24 and received his requested abbreviated weather briefing on the current conditions for southern Oklahoma including DUC and Lawton. The pilot was briefed on an Airmet for IFR conditions throughout the night with the current conditions at DUC showing wind calm, visibility 1 1/2 mile, fog, ceiling broken clouds at 100 feet, temperature and dew point equal at 6 degrees Celsius (43 degrees Fahrenheit). The DUC AWOS was showing wind calm, visibility 1/4 mile, fog, 100 scattered clouds, ceiling broken at 1,000 feet, temperature and dew point at 4 degrees Celsius ( 39 degrees Fahrenheit). The Chickasha Airport, located approximately 35 nautical miles north of DUC, reported a ceiling of 100-foot overcast, 1/4 mile visibility. The Fort Sill (Lawton) Airport, located approximately 24 nautical miles northwest of DUC, reported a 1,200-foot broken ceiling with 3/4 mile visibility and mist.

The pilot of Swiftwing 200 requested and received radar vectors from the Fort Sill approach controller. At 2227, the flight was 2-3 miles south of the initial approach fix (IAF)(GYROE) and was cleared for the localizer 35 approach. Approximately 2229, Swiftwing 200 was identified at GYROE, and cleared to change to the airport advisory frequency (122.8 Megahertz). Approximately 2231, the controller noted static on his radio frequency and a power fluctuation at the approach facility. Subsequently, radio contact could not be established with Swiftwing 200. The approach facility personnel contacted the fixed base operator (FBO) at the airport, who reported that the airplane had not landed at the airport. Search and rescue was initiated by Fort Sill and airport personnel.

A witness/company pilot, who was located at the approach end of runway 35 in his vehicle, with a handheld radio turned to the frequency of 122.8 Megahertz (MHz), reported that he heard the pilot of Swiftwing 200 report reaching GYROE, and transmit "Duncan traffic Swiftwing 200 GYROE inbound, are the lights full intensity." The witness replied "Roger Swiftwing 200." At 2232, according to the clock in his vehicle, the witness observed the airport power fluctuations with the airport lights. When Swiftwing 200 did not land, the witness initiated a search for Swiftwing 200.

The pilot reported that his weather briefing indicated fog at the destination airport. En route, the pilot noted patchy fog, and during the controller's vector of the airplane, he recalled seeing the entire airport. He recalled the following sequence: descent to 2,700 feet, base leg, localizer intercept, the approach clearance, approach checklist, seeing the runway and continuing the descent, respectively.

Personnel of the power company reported the height of the power lines was 38 feet 6 inches above the ground (AGL) at the point of impact. Physical evidence at the accident site was consistent with the aircraft striking the electrical static wires near mid-span between two H-frame structures, which were approximately 47 feet 6 inches agl. The power company recorded a power spike (fault) at 22:31:11 on the night of the accident.

PERSONNEL INFORMATION

A review of FAA records and company data revealed that the pilot was issued a first class medical certificate without limitations on June 28, 2001. The commercial pilot held airplane single-engine land, twin-engine land, and instrument ratings. He was a certificated flight instructor for the single-engine land and instrument ratings.

The pilot was employed by Safewing Aviation Company, Incorporated, in July 2001, and he completed their training program for the PA-23 airplane. He satisfactorily completed the CFR Part 135 airman competency/proficiency check in a PA-23-250 airplane on July 16, 2001.

According to the company records and the Pilot/Operator Aircraft Accident report (NTSB 6120.1), the accumulated flight time at the time of employment, was 1,211.9 hours, of which 199.3 hours were the pilot-in-command of multiengine land airplanes. At the time of the accident, the accumulated flight time was 1,660.5 hours of which 45.3 hours was actual instrument flight time. The accumulated flight time for the pilot under CFR Part 135 was 423.7 hours.

At the time of the accident, the company was authorized to conduct on demand operations under CFR Part 135. The company operated 3 multiengine airplanes for passenger and/or cargo flight, and 6 single-engine aircraft for cargo only flights. The airplane, N127CA was flown on two round trip cargo flights Monday through Friday of each week. Three pilots rotated the flights. The commercial pilot of Swiftwing 200 flew both round trip cargo flights on the day of the accident. The first route trip of the day consisted of four segments: DUC to LAW, LAW to OKC, OKC to TUL, and TUL to DUC. The second route trip of the day consisted of four segments: DUC to OKC, OKC to TUL, TUL to OKC, and OKC to DUC. During the second route trip, on the day of the accident, Swiftwing 200 diverted to PWA due to weather at OKC during the TUL to OKC route segment.

AIRCRAFT INFORMATION

The original registration number, N40365, was changed to N7FV in 1975, and to N127CA prior to the accident date. The Piper PA-23-250 airplane, serial number 27-7305125, was registered to the current owner on December 29, 1999. The aircraft was maintained under CFR Part 135 by Safeway Aviation Company, Inc. The last annual inspection was performed on August 1, 2001, at a total airframe time of 8,611 hours (Hobbs 2,695 hours). The accumulated time on the aircraft at the time of the accident was 8,664 hours (53 hours since the last annual inspection).

The left engine, a Lycoming IO-540-C4B5, serial number L-11296-48, was overhauled at T.W. Smith Engine Company., Inc., Cincinnati, Ohio, and re-installed in June 1996. At the last annual inspection, this engine had accumulated 730 hours since major overhaul (SMOH), the left propeller, a Hartzell HC-E2R-2RBSF, serial number BP3570, had accumulated 470 hours SMOH.

The right engine, a Lycoming IO-540-C4B5, serial number L-8996-48, was overhauled at T. W. Smith Engine Company., Inc., Cincinnati, Ohio, and re-installed in June 1996. At the last annual inspection, this engine had accumulated 730 hours SMOH, the right propeller, serial number 54, had accumulated 720 hours SMOH.

In May 1978, the navigation equipment was installed. In April 1983, an overhauled turn coordinator was installed. In March 1984, the right vacuum pump was replaced. In April 1986, the manifold pressure gage was replaced. In February 1987, the standby horizon was replaced with an overhauled unit. In September 1999, the HSI on the left instrument panel was installed following repair. In October 1999, the Apollo model GX-50-GPS unit was installed and interfaced with the HSI via MD41-724 annunciator panel. In August 2000, the ADF was removed and replaced with an overhauled unit. In November 2000, the directional gyro was removed, repaired, and re-installed. In February 2001, the left vacuum pump was replaced. In August 2001, the altimeter was certified.

METEOROLOGICAL INFORMATION

At 2005, the Automated Weather Observation System (AWOS) at DUC recorded the wind from 110 degrees at 3 knots, 1/4 statute mile visibility, fog, ceiling broken at 100 feet, overcast at 3,900 feet, temperature 9 degrees Centigrade (C.) (48 degrees Fahrenheit), dew point 9 degrees C., and the altimeter 29.95 inches of Mercury.

At 2105, the AWOS at DUC recorded calm wind, 1/4 statute mile visibility, fog, ceiling overcast at 100 feet, temperature 6 degrees C. (43 degrees Fahrenheit), dew point 6 degrees C., and the altimeter 29.97 inches of Mercury.

At 2205, the AWOS at DUC recorded calm wind, 1/4 statute mile visibility, fog, ceiling overcast at 100 feet, temperature 5 degrees C. (41 degrees Fahrenheit), dew point 5 degrees C., and the altimeter 29.97 inches of Mercury.

At 2235, the AWOS at DUC recorded calm wind, 1/4 statute mile visibility, fog, overcast ceiling at 100 feet, temperature 5 degrees C., dew point 5 degrees C., and the altimeter 29.99 inches of Mercury. Airport personnel and local authorities reported areas of dense patchy fog in the general vicinity of the airport.

AERODROME INFORMATION

The Duncan/Halliburton Field (DUC), Latitude 34 degrees 28.25 minutes north; Longitude 97 degrees 57.59 minutes west, is a non-towered airport with one runway, runway 17/35. Runway 17/35 is a concrete surfaced runway, 6,650 feet long, and 100 feet wide. The airport elevation is 1,113 feet, and runway 35 has a touchdown zone elevation of 1,097 feet. Runway 35 is equipped with a runway end identified lights (REIL) lighting system and 2.94 degree glide path angle 4-box visual approach slope indicator (VASI) on the left side of the runway. The medium intensity runway lights (MIRL) runway lights are pilot activated on the common traffic advisory frequency (CTAF) 122.8 Megahertz. A timer operates the runway lights and the taxiwa...