# NTSB investigations, AZ: Loss of engine power(partial) - mech failure/malf NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports. ## Latest cases - [NTSB LAX08LA009](https://openairdocs.org/ntsb/LAX08LA009.md): Cessna 172L · Prescott, AZ · Accident · Minor injuries · Limited investigation · Final report · Oct 10, 2007 · N9897G · Substantial damage > The failure of maintenance personnel to detect fatigue cracks in the number 3 exhaust rocker arm, which lead to a partial loss of engine power. - [NTSB SEA08LA001](https://openairdocs.org/ntsb/SEA08LA001.md): Cessna 172N · Green Valley, AZ · Accident · No injuries · Limited investigation · Final report · Oct 2, 2007 · N6291D · Substantial damage > The loss of engine power due to the separation of the number three cylinder exhaust rocker arm. - [NTSB LAX07LA153](https://openairdocs.org/ntsb/LAX07LA153.md): Piper PA-28-140 · Tucson, AZ · Accident · No injuries · Limited investigation · Final report · May 8, 2007 · N5895U · Substantial damage > A loss of engine power while maneuvering due to a broken exhaust valve. Contributing to the accident was the rough terrain. - [NTSB LAX06LA164](https://openairdocs.org/ntsb/LAX06LA164.md): Boeing Stearman E75 · Show Low, AZ · Accident · No injuries · Limited investigation · Final report · May 7, 2006 · N5263N · Substantial damage > the collapse of the air intake duct resulted in a loss of engine power. A factor was the uneven terrain in the landing area. - [NTSB LAX05LA214](https://openairdocs.org/ntsb/LAX05LA214.md): Piper PA-28R-200 · Happy Jack, AZ · Accident · No injuries · Limited investigation · Final report · Jun 16, 2005 · N5229T · Substantial damage > The fracture/separation of an engine intake valve during cruise flight, which resulted in a partial loss of engine power and a forced landing. - [NTSB LAX05LA025](https://openairdocs.org/ntsb/LAX05LA025.md): Eurocopter AS350B3 · Sierra Vista, AZ · Accident · No injuries · Limited investigation · Final report · Nov 2, 2004 · N106LN · Substantial damage > An inconsistency between the engines' two N2 sensor signals caused the fuel control to enter a fixed mode, which limited the power available. Contributing to the accident was the lack of altitude and airspeed available to give the pilot time to select a… - [NTSB LAX05LA002](https://openairdocs.org/ntsb/LAX05LA002.md): Classic Waco YMF · Sedona, AZ · Accident · No injuries · Limited investigation · Final report · Oct 2, 2004 · N43064 · Substantial damage > a loss of engine power due to the fatigue fracture of the number 7 cylinder exhaust rocker arm as a result of a grinding operation during manufacture. - [NTSB LAX03LA260](https://openairdocs.org/ntsb/LAX03LA260.md): Ercoupe 415-C · Saint Johns, AZ · Accident · No injuries · Limited investigation · Final report · Aug 22, 2003 · N3182H · Substantial damage > The failure of the exhaust valve on the number two engine cylinder, which resulted in a partial loss of engine power during the final approach to land, and an on ground collision with a ditch during the subsequent off-airport landing roll. - [NTSB LAX03LA050](https://openairdocs.org/ntsb/LAX03LA050.md): Anderson Rotorway Exec 162F · Phoenix, AZ · Accident · No injuries · Limited investigation · Final report · Dec 16, 2002 · N30545 · Substantial damage > The separation of the exhaust valve stem in the number 1 cylinder, which resulted in a partial loss of engine power during the landing flare and a hard landing. - [NTSB LAX02LA096](https://openairdocs.org/ntsb/LAX02LA096.md): Rotorway Rotorway Exec 90 · Phoenix, AZ · Accident · No injuries · Limited investigation · Final report · Feb 25, 2002 · N9876D · Substantial damage > The student's inadvertent over control of the throttle mechanism, which resulted in the bending of the throttle mechanical stop and binding the linkage in the idle position. Also causal was the CFI's inadequate supervision. A factor in the accident was the… - [NTSB LAX01LA140](https://openairdocs.org/ntsb/LAX01LA140.md): Cessna 210B · Camp Verde, AZ · Accident · No injuries · Limited investigation · Final report · Apr 6, 2001 · N126RA · Substantial damage > The throttle linkage disconnection resulting in the engine producing idle power. A factor was the lack of suitable terrain for a forced landing. - [NTSB LAX01IA118](https://openairdocs.org/ntsb/LAX01IA118.md): McDonnell Douglas MD-88 · Tucson, AZ · Incident · No injuries · Incident investigation · Final report · Mar 15, 2001 · N996DL · Minor damage > the failure of 4th stage turbine blades during takeoff roll, which resulted in a dynamic imbalance in the engine. - [NTSB LAX00FA347](https://openairdocs.org/ntsb/LAX00FA347.md): Cessna 207A · Valle, AZ · Accident · Minor injuries · Field investigation · Final report · Sep 23, 2000 · N9439M · Substantial damage > Improper maintenance and adjustment of the engine magnetos resulting in a loss of optimum performance during a critical takeoff that required peak engine performance. - [NTSB LAX98LA139](https://openairdocs.org/ntsb/LAX98LA139.md): Bell 206B · Grand Canyon, AZ · Accident · No injuries · Limited investigation · Final report · Apr 20, 1998 · N8533F · Substantial damage > The malfunction and erratic speed control of the engine's governor, and the flight instructor's delayed remedial action. - [NTSB LAX97LA261](https://openairdocs.org/ntsb/LAX97LA261.md): Classic Waco YMF · Sedona, AZ · Accident · No injuries · Limited investigation · Final report · Jul 26, 1997 · N369BP · Substantial damage > A partial loss of engine power due to a loose rocker arm adjustment nut on the number 6 cylinder. The loose adjustment nut was due to inadequate maintenance adjustment performed by the engine manufacturer. - [NTSB LAX97LA163](https://openairdocs.org/ntsb/LAX97LA163.md): Piper PA-28R-201T · Tucson, AZ · Accident · No injuries · Limited investigation · Final report · Apr 18, 1997 · N2847F · Substantial damage > The partial blockage of the No. 2 cylinder injection line/nozzle by a transient contaminant, which induced an excessively lean mixture in that cylinder, and the subsequent overheating of the cylinder and intake valve. The engine power loss was due to the open… - [NTSB LAX96LA210](https://openairdocs.org/ntsb/LAX96LA210.md): Rotorway Exec 9 · Chandler, AZ · Accident · No injuries · Limited investigation · Final report · May 22, 1996 · N89678 · Substantial damage > a loss of engine power due to a failed piston and piston ring in a critical phase of flight. - [NTSB LAX96LA167](https://openairdocs.org/ntsb/LAX96LA167.md): Maule M-5-235C · Lake Havasu Cty, AZ · Accident · No injuries · Limited investigation · Final report · Apr 14, 1996 · N9177E · Substantial damage > the pilot-owner's inadequate engine maintenance which resulted in a progressive ignition failure. Factors which contributed to the accident were the dark nighttime light condition and the presence of hidden obstructions in the forced landing area. - [NTSB LAX96LA023](https://openairdocs.org/ntsb/LAX96LA023.md): Great Lakes 2T-1A-2 · Chandler, AZ · Accident · No injuries · Limited investigation · Final report · Oct 26, 1995 · N3808F · Substantial damage > the improper installation of an intake manifold tube assembly during engine overhaul which permitted leakage into the induction system resulting in detonation and piston failure in the associated cylinder. - [NTSB LAX95LA290](https://openairdocs.org/ntsb/LAX95LA290.md): Piper PA-30-B · Wickenberg, AZ · Accident · Serious injuries · Limited investigation · Final report · Aug 12, 1995 · N8113Y · Substantial damage > the pilot's improper emergency procedures. The pilot's diverted attention, and the magnetos clearance and timing were factors in this accident. - [NTSB LAX95LA253](https://openairdocs.org/ntsb/LAX95LA253.md): Piper PA-25-235 · Maricopa, AZ · Accident · No injuries · Limited investigation · Final report · Jul 6, 1995 · N9188T · Substantial damage > an undetermined internal failure of the carburetor. - [NTSB LAX95LA149](https://openairdocs.org/ntsb/LAX95LA149.md): Bulsky Skybolt · Goodyear, AZ · Accident · No injuries · Limited investigation · Final report · Mar 31, 1995 · N94BV · Destroyed > fuel starvation due to the partial failure of the fuel pump caused by the broken crankshaft idler gear attachment screw lockplate. The unsuitable terrain and trees were factors in this accident. - [NTSB LAX95LA064](https://openairdocs.org/ntsb/LAX95LA064.md): Rockwell S2R Thrush Cmdr · Yuma, AZ · Accident · No injuries · Limited investigation · Final report · Dec 29, 1994 · N8455V · Substantial damage > a forced landing due to an engine failure of the no.1 cylinder. - [NTSB LAX94LA225](https://openairdocs.org/ntsb/LAX94LA225.md): Staudacher 300S · Chandler, AZ · Accident · Serious injuries · Limited investigation · Final report · May 28, 1994 · N791S · Substantial damage > The operation of the engine at an RPM setting that exceeded the original design specifications and resulted in the failure of the no. 5 connecting rod bearing. - [NTSB LAX93LA150](https://openairdocs.org/ntsb/LAX93LA150.md): Cessna 172 · Gila Bend, AZ · Accident · Minor injuries · Limited investigation · Final report · Mar 14, 1993 · N4070F · Substantial damage > The failure of maintenance personnel to perform mandatory service bulletins during the annual inspection 20 flying hours prior to the accident which resulted in the carburetor's primary venturi becoming loose. - [NTSB LAX93LA040](https://openairdocs.org/ntsb/LAX93LA040.md): Cessna 172G · Williams, AZ · Accident · Serious injuries · Limited investigation · Final report · Nov 15, 1992 · N6060R · Substantial damage > The partial loss of engine power due to a stuck exhaust valve on the number two cylinder and the pilot's inability to climb the aircraft above the trees surrounding the airport. A factor in the accident was the effects of the high density altitude on the… - [NTSB LAX92FA092](https://openairdocs.org/ntsb/LAX92FA092.md): Cessna T210L · Temple Bar, AZ · Accident · 2 fatal · Field investigation · Final report · Jan 13, 1992 · N22592 · Destroyed > Fatigue failure of the turbocharger's turbine shaft due to inadequate maintenance, and the pilot's improper in-flight planning/decision after experiencing a turbocharger failure. A factor related to the accident was: the lack of information in the pilot… - [NTSB LAX92LA045](https://openairdocs.org/ntsb/LAX92LA045.md): Cessna 152 · Maricopa, AZ · Accident · No injuries · Limited investigation · Final report · Nov 14, 1991 · N5552M · Substantial damage > The cfi's inadequate supervision and his delayed remedial action. A factor was carburetor icing conditions. - [NTSB LAX92LA020](https://openairdocs.org/ntsb/LAX92LA020.md): Piper PA28-161 · Chandler, AZ · Accident · No injuries · Limited investigation · Final report · Oct 20, 1991 · N8092A · Substantial damage > An engine malfunction produced by exhaust valves stuck in the open position. Contributing to the accident was an unsuitable landing area and a sign adjacent to the landing area. - [NTSB LAX91LA413](https://openairdocs.org/ntsb/LAX91LA413.md): Grumman G164A-450 · Queen Creek, AZ · Accident · Minor injuries · Limited investigation · Final report · Sep 29, 1991 · N16SS · Substantial damage > Failure of the engine cylinder, producing a loss of power. Contributing to the accident was the location of an irrigation ditch next to the landing area and a dark night light condition. - [NTSB LAX91LA129](https://openairdocs.org/ntsb/LAX91LA129.md): Cessna 421B · Tucson, AZ · Accident · Serious injuries · Limited investigation · Final report · Mar 12, 1991 · N924MD · Substantial damage > The fatigue failure of the right engine turbo exhaust clamp, and, the failure of the flying pilot to complete the single engine emergency procedures in a timely manner. A factor in the accident was the failure of the pilot in command to adequately supervise… - [NTSB LAX91LA033](https://openairdocs.org/ntsb/LAX91LA033.md): Mooney M20E · Tuba City, AZ · Accident · Minor injuries · Limited investigation · Final report · Nov 17, 1990 · N5703Q · Substantial damage > Failure of the piston rings which reduced the available engine power, and the pilot's continued operation of his airplane with a known engine deficiency during the relatively high density altitude conditions. - [NTSB LAX91DUJ03](https://openairdocs.org/ntsb/LAX91DUJ03.md): Air Tractor AT-302 · Somerton, AZ · Accident · No injuries · Final report · Nov 16, 1990 · N4441S · Substantial damage > The failure of the number 3 exhaust valve which led to an engine failure and subsequent crash landing. - [NTSB LAX90LA175](https://openairdocs.org/ntsb/LAX90LA175.md): Piper PA23-160 · Flagstaff, AZ · Accident · No injuries · Limited investigation · Final report · May 15, 1990 · N4232P · Substantial damage > The failure of the pilot to maintain directional control and to feather the propeller. A factor was erratic power from the left engine due to the jamming of the fuel selector valve in an intermediate position. - [NTSB LAX89LA273](https://openairdocs.org/ntsb/LAX89LA273.md): Cessna 172N · Seligman, AZ · Accident · Minor injuries · Limited investigation · Final report · Aug 13, 1989 · N5961J · Substantial damage > A loss of engine power due to a failure of the number 3 cylinder exhaust valve rocker arm pivot stud, which was in turn caused by a stuck exhaust valve. - [NTSB LAX89LA217](https://openairdocs.org/ntsb/LAX89LA217.md): Cessna 421 · Picacho, AZ · Accident · Minor injuries · Limited investigation · Final report · Jun 17, 1989 · N421S · Destroyed > Failure of the number three exhaust valve on the left engine. A major factor was the high density altitude where the airplane would not operate on single engine. - [NTSB LAX88DUJ06](https://openairdocs.org/ntsb/LAX88DUJ06.md): Grumman G-164B · Chandler, AZ · Accident · No injuries · Final report · Jul 22, 1988 · N66890 · Substantial damage > During an aerial application flight, the engine experienced a loss of power. A forced landing was made in an open field and during the landing roll the airplane nosed over. Inspection of the engine revealed that the number five cylinder dome separated from… - [NTSB LAX88LA266](https://openairdocs.org/ntsb/LAX88LA266.md): Bellanca 17-30A · Springerville, AZ · Accident · No injuries · Limited investigation · Final report · Jul 18, 1988 · N14683 · Substantial damage > Shortly after takeoff, the engine experienced a loss of power. The pilot made a forced landing where during the landing roll, the airplane collided with the terrain. During the engine inspection, it was found that the left magneto fired only one sparkplug.… - [NTSB LAX87LA312](https://openairdocs.org/ntsb/LAX87LA312.md): Gulfstream American AA-5A · Tucson, AZ · Accident · Minor injuries · Limited investigation · Final report · Aug 23, 1987 · N26250 · Substantial damage > The plt reported that just after takeoff, the engine lost partial power & he was unable to land back at the airport. During an emergency landing, the aircraft collided with a utility line & pole. An exam of the engine revealed that a rocker arm on the #4… - [NTSB LAX87FA151](https://openairdocs.org/ntsb/LAX87FA151.md): Cessna T210K · Prescott, AZ · Accident · Serious injuries · Field investigation · Final report · Mar 20, 1987 · N8105G · Destroyed > After overloading the aircraft with 5 pax and baggage, the pilot departed on a personal cross country flight to phoenix, AZ. He climbed the acft to and maintained an altitude of 14,500 feet MSL until reaching salt lake city, UT. The aircraft was then… - [NTSB LAX87LA113](https://openairdocs.org/ntsb/LAX87LA113.md): Cessna 152 · Tucson, AZ · Accident · No injuries · Limited investigation · Final report · Feb 8, 1987 · N24317 · Substantial damage > During a local dual instructional flight, the pilot reported that the aircraft developed a vibration and a substantial power loss. The acft was forced to land off the arpt in the high vegetation. Examination of the aircraft revealed that the #3 cylinder was… - [NTSB LAX84LA291](https://openairdocs.org/ntsb/LAX84LA291.md): Taylorcraft F21 · Payson, AZ · Accident · No injuries · Limited investigation · Final report · May 13, 1984 · N2005U · Substantial damage > The acft was landed 200 ft short of the rwy in bushes after the engine hesitated during the plts application of throttle in an attempt to reach the rwy. An FAA inspector found the magneto timing set to 23 plus degrees rather than the prescribed 20 degrees. - [NTSB LAX84LA162](https://openairdocs.org/ntsb/LAX84LA162.md): Beech K35 · Flagstaff, AZ · Accident · No injuries · Limited investigation · Final report · Jan 20, 1984 · N9510R · Substantial damage > Cruising at 10,500 ft the number 5 cylinder separated from the engine ass'y causing the loss of power. During the forced ldg roll the acft collided with a snow covered log collapsing the nose gear. The engine was overhauled in 1980. 1,239 hrs of operation had… - [NTSB LAX83LA177](https://openairdocs.org/ntsb/LAX83LA177.md): Cessna T188C · Soloman, AZ · Accident · Serious injuries · Limited investigation · Final report · Apr 2, 1983 · N2074J · Substantial damage > The acft experienced a partial power loss and made an emergency landing in the field it was spraying. The acft had only made one spraying pass since being serviced with a full load of fuel and 140 gallons of chemical before the power loss occurred. As the… - [NTSB LAX82FA196](https://openairdocs.org/ntsb/LAX82FA196.md): Cessna 320D · Chandler, AZ · Accident · 8 fatal · Field investigation · Final report · May 27, 1982 · N4167T · Destroyed > Shortly after the aircraft took off from stellar airpark, several witnesses saw it flying northbound with smoke trailing from the left engine. One witness, a student pilot, stated that the gear was down and the plane was lower than normal, about 500 ft AGL.… - [NTSB LAX82DA121](https://openairdocs.org/ntsb/LAX82DA121.md): Cessna 150G · Tucson, AZ · Accident · No injuries · Final report · Mar 28, 1982 · N4816X · Substantial damage > During flight, the student pilot heard a loud noise from the engine and landed at a nearby airport. He reported that during the landing, a gust of wind was encountered, the left wing came up and the nose veered left. At that time, the right spindle attachment… ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1 WHERE c."eventStateOrRegion" = 'AZ' AND c."eventCountry" = 'USA' AND c."mKey" IN (SELECT o.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o."occurrenceNumber" = 1 AND o."occurrenceCode" = 352) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?occurrence=352&state=AZ --- 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.