# NTSB FTW97LA263: Bronner Steen Skybolt, N773HD, Brazoria, TX, July 12, 1997 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: July 11, 1997, 19:00 local (Jul 12, 1997, 00:00 UTC) - Place: Brazoria, TX - Coordinates: 29.039875, -95.559921 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=29.0399&lon=-95.5599&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 2 serious - Status: Completed, report June 26, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 20277 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW97LA263 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/20277/pdf - Page: https://openairdocs.org/ntsb/FTW97LA263 ## Probable cause a fuel leak at a wobble pump fuel hose clamp, which resulted in loss of fuel and fuel exhaustion. A related factor was the lack of suitable terrain for a forced landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, maneuvering - fuel system,line - leak (cause) - fluid,fuel - exhaustion (cause) - Forced landing, emergency descent/landing - In flight collision with object, emergency landing - terrain condition - none suitable (contributing factor) - object - tree(s) (contributing factor) - In flight collision with terrain/water, descent - uncontrolled ## Analysis The Skybolt experimental airplane was flying east of the airport when the 'engine start[ed] missing.' The aircraft entered downwind for runway 11 at the Eagle Air Park Airport. The pilot reported that while on crosswind, about 12 minutes after takeoff, he smelled 'raw fuel, looked down on floor board, [and] saw fuel.' The fuel pressure which was normally 30 psi, began to fluctuate 'radically,' and the engine 'cut out.' The pilot turned on the electric fuel pump, and the engine 'came back up to power.' After turning final, the engine started 'cutting in and out, [the] fuel pressure could not be kept up,' and the engine lost power. Unable to reach a suitable area, the pilot landed the airplane in trees; the airplane then 'hit [the] ground flat.' Prior to the accident flight, the pilot fueled the airplane with 15 gallons of 100 octane low lead aviation fuel. An FAA inspector's examination of the fuel system revealed no apparent signs of rupture or lack of integrity, and there was no fuel in the fuel tank. After the airplane was moved another FAA inspector pumped the wobble pump and could smell fuel. The pilot/owner found that one of the hoses that was connected to the wobble pump, which was located under the pilot's seat, had been leaking fuel at its clamp. Fuel stains were found on the fabric aft of the wobble pump. ## Factual narrative On July 11, 1997, at 1900 central daylight time, a Bronner Steen Skybolt experimental airplane, N773HD, registered to and operated by the pilot as a Title 14 CFR Part 91 personal flight, was substantially damaged during a forced landing following a loss of engine power while maneuvering near Brazoria, Texas. Visual meteorological conditions prevailed for the local flight, and a flight plan was not filed. The private pilot and his passenger were seriously injured. The flight had originated from the Eagle Air Park Airport near Brazoria, Texas, about 15 minutes before the accident. During a telephone interview conducted by the investigator-in-charge and on the enclosed Pilot/Operator Accident Report, the pilot reported that prior to the accident flight he cleaned the fuel strainer and fueled the airplane with 15 gallons of 100 octane low lead aviation fuel. The pilot further reported that about 1845, he "took [the] Skybolt up for a run around the patch at Eagle Air Park." After about 12 minutes while on cross wind for runway 11, he smelled "raw fuel, looked down on floor board, [and] saw fuel." The fuel pressure which is normally 30 psi, began to fluctuate "radically," and the engine "cut out." He turned on the electric fuel pump, and the engine "came back up to power." After turning final the engine started "cutting in and out, [the] fuel pressure could not be kept up," and the engine lost power. He took a quick look at the visual fuel indicator, and it showed the fuel level between the 2 and 4 gallon marks. With no place to land he intentionally stalled the aircraft into the trees. The aircraft "hit [the] ground flat and in an area about 150 feet square." According to a witness, the airplane was flying east of the airport when he heard the "engine start missing and [the] power go away. Then [the] power came back again." The aircraft entered downwind and the "engine went away again." After the aircraft turned final approach, "the engine barely came back and then no engine noise at all." Witnesses reported that when they arrived at the crash site there was no smell of fuel. Examination of the airplane at the crash site by the FAA inspector revealed that the airplane came to rest upright .2 miles from the approach end of Eagle Air Park Airport's runway 11. Examination of the airplane's fuel system revealed no apparent signs of rupture or lack of integrity, and there was no fuel in the fuel tank. The airplane sustained structural damage to the left wing and empennage, and the main landing gear were separated from the fuselage. The airplane's engine was partially separated from the fuselage. Another FAA inspector examined the airplane after it was moved to a hangar. When the FAA inspector pumped the wobble pump, he could smell fuel; however, he could not see where the fuel was coming from due to the location of the wobble pump and its fuel hoses. The pilot reported to the investigator-in-charge that he examined the airplane's fuel system and found one of the hoses that was connected to the wobble pump, which was located under the pilot's seat, had been leaking fuel at its clamp. He also found fuel stains on the fabric aft of the wobble pump. ## Aircraft - Registration: [N773HD](https://openairdocs.org/aircraft/N773HD), registered now, S/N 07DB (OpenAirDocs) - Reported make and model: Bronner STEEN SKYBOLT (STEEN SKYB) - Registry model: [Bronner STEEN SKYBOLT](https://openairdocs.org/model/bronner-steen-skybolt) (registry code 0565565) (OpenAirDocs) - Registry engine: [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series) (registry code 41530, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 07DB - Airframe hours: 245 - Engines: Lycoming IO-560 260 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Joseph B. Ware - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, August 16, 1996, 10 hours before - Departed: 2C0 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 40; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: rear; flight hours: 980 total, 150 in this make and model, 980 as pilot in command, 30 in the last 90 days, 10 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 5 knots, gusting 7 - Visibility: 15 statute miles - Lowest ceiling: none - Temperature: 72 °F - Altimeter: 30.00 inHg ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19970711018219A](https://openairdocs.org/incident/19970711018219A), Jul 11, 1997: Amtr STEENSKYBOLT, Brazoria, TX, Substantial damage. Lost power and crash landed. Fuel tanks were empty. Pilot reported fuel leak. Landed due fire threat. (.4)the skybolt experimental airplane was flying east of… ## Other investigations on N773HD (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB FTW91DRA03](https://openairdocs.org/ntsb/FTW91DRA03), Jun 8, 1991: Bronner Skybolt (N773HD), Alvin, TX, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN TERRAIN CLEARANCE. A FACTOR WAS THE PILOT'S DECISION TO PERFORM A LOW PASS. From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.