# NTSB DFW05CA157: Grumman AA1B, N1466R, Llano, TX, July 5, 2005 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Data collection · Final report - Date: July 5, 2005, 18:45 local (23:45 UTC) - Place: Llano, TX - Coordinates: 30.783611, -98.657218 - Nearby events: https://openairdocs.org/map.md?lat=30.7836&lon=-98.6572&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious, 1 minor - Status: Completed, report October 27, 2005 - Report: Approved by Office Director - Parties: San Antonio, Air Safety Investigator, Lycoming - NTSB case key (mKey): 61680 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DFW05CA157 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/61680/pdf - Page: https://openairdocs.org/ntsb/DFW05CA157 ## Probable cause The partial loss of engine power for undetermined reasons during takeoff resulting in an overrun. A factor was the high density altitude. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - nonmechanical, takeoff - aborted - reason for occurrence undetermined - Overrun, takeoff - aborted - weather condition - high density altitude (contributing factor) - object - tree(s) - On ground/water encounter with terrain/water, takeoff - aborted - terrain condition - ground - Nose over, takeoff - aborted ## Analysis The 204-hour pilot picked up a passenger at Llano Municipal Airport (AQO), and prior to departure, he filled the left tank with fuel and that the right tank had approximately 7 gallons of fuel in it. The pilot also reported that it was a "hot-muggy" afternoon. The pilot departed runway 17 and after reaching 50-75 feet into the air, he reported that the engine "started to lose power and settle back to the ground". The airplane came to rest inverted, off the end of the runway. The density altitude was calculated by the NTSB investigator-in-charge to be 3,967 feet and that the aircraft was with in a few pounds (+/-) of it's maximum take-off weight of 1,560 pounds. Examination of the airplane's engine was conducted on July 13, 2005, by the engine manufacturer's representative under the supervision of the NTSB investigator-in-charge. The engine was successfully run for approximately 5 minutes at various power settings. The engine was run to full throttle, which resulted in a reading of approximately 2,200 rpm. An additional 150 rpm was gained by leaning the engine. Per the Type Certificate Data Sheet the minimum static rpm should be 2150 at full power. ## Factual narrative On July 5, 2005, at 1845 central daylight time, a single-engine Grumman AA-1B airplane, N1466R, was substantially damaged during an overrun when it impacted terrain following a reported loss of engine power during takeoff near Llano, Texas. The airplane was owned and operated by a private individual. The private pilot received serious injuries and his passenger received minor injuries. Visual meteorological conditions prevailed and a flight plan was not filed for the 14 Code of Federal Regulations Part 91 flight. The local flight was departing from the Llano Municipal Airport (AQO), near Llano, Texas, at the time of the accident, and was destined for the Eldorado Airport (27R). The 204-hour private pilot reported in the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2) that he picked up a passenger at AQO, and prior to departure he filled the left tank with fuel. He also stated that the right tank contained approximately 7 gallons of fuel. The pilot added that it was a "hot and muggy" afternoon. The pilot departed runway 17 (4,202 foot by 75-foot asphalt), and after reaching 50-75 feet above the ground, he reported that the engine "started to lose power and settled back to the ground". At that point, the pilot elected to abort the take-off. The airplane overran the departure end of the runway, coming to rest in the inverted position in a wooded area, off the departure end of the runway. An FAA inspector examined the airplane at the accident site and reported the right wing and nose gear had been sheared-off. Additionally, the airplane had extensive damage to the canopy, fuselage, and empennage. The density altitude was calculated by the NTSB investigator-in-charge to be 3,967 feet. A review of the weight and balance calculations revealed the aircraft was within a few pounds (+/-) of it's maximum take-off weight of 1,560 pounds. Examination of the airplane was conducted on July 13, 2005, at the facilities of Air Salvage of Dallas, near Lancaster, Texas, by a representative from Lycoming, under the supervision of the NTSB investigator-in-charge. The Lycoming engine was successfully run for approximately 5 minutes at various power settings. The engine was run to full throttle, which resulted in an rpm reading of approximately 2,200. An additional 150 rpm was gained by leaning the engine. Per the Type Certificate Data Sheet the minimum static rpm should be 2150 rpm at the maximum throttle setting (McCauley 1A105/SCM-7157 propeller). At 1905, the automated weather observing system at AQO, reported calm wind, 5 miles visibility in haze, sky clear, temperature 97 degrees Fahrenheit, dew point 64 degrees Fahrenheit, and an altimeter setting of 29.95 inches of Mercury. ## Aircraft - Registration: [N1466R](https://openairdocs.org/deregistered/N1466R-2013-08-15), registration cancelled 2013-08-15, S/N AA1B-0566, built 1975 (OpenAirDocs) - Reported make and model: Grumman AA1B - Registry model: [Grumman American Avn. AA-1B](https://openairdocs.org/model/grumman-american-avn-aa-1b) (registry code 3960103) (OpenAirDocs) - Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs) - Category: Airplane - Serial number: AA1B-0566 - Airframe hours: 3111 - Engines: Lycoming O-235-C2C reciprocating - Damage: Substantial damage - Fire: On-Ground - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 1, 2004, 104 hours before - Departed: 6R9, Llano, TX - Destination: 27R, ELDORADO, TX - Airport: 6R9, Llano Muni, runway 17, 4,202 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 46; injuries: serious; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review November 1, 2003; seat: left; flight hours: 204 total, 170 in this make and model, 25 in the last 90 days, 10 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 0° at 0 knots - Visibility: 5 statute miles - Lowest ceiling: none - Temperature: 97 °F, dew point 64 °F - Altimeter: 29.95 inHg - Observed at: AQO ## 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 20050705015439A](https://openairdocs.org/incident/20050705015439A), Jul 5, 2005: Amrgen AA1B, Llano, TX, Destroyed. (-23) Pilot had flown from el dorado TX to Llano TX to pick up a passenger and return to el dorado to look at some cattle. They fueled the aircraft at Llano.… 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.