Crash of a Piper PA-31-310 Navajo near Atlanta: 3 killed

Date & Time: Mar 12, 2002 at 1437 LT
Type of aircraft:
Registration:
N2336V
Flight Phase:
Flight Type:
Survivors:
No
Site:
Schedule:
Idaho Falls - Boise
MSN:
31-135
YOM:
1968
Location:
Crew on board:
1
Crew fatalities:
Pax on board:
2
Pax fatalities:
Other fatalities:
Total fatalities:
3
Captain / Total flying hours:
20647
Captain / Total hours on type:
338.00
Aircraft flight hours:
7940
Circumstances:
The aircraft was cleared direct and to climb to 14,000 feet. During the climb out, the controller inquired several times as to the flights altitude. The pilot's response to the controllers queries were exactly 10,000 feet lower than what the controller was indicating on radar. Eventually the controller instructed the pilot to stop altitude squawk, which he did. During the last communication with the pilot, he reported that he was level at 14,000 feet. During the next approximately 45 minutes, the aircraft was observed proceeding generally in the direction of its destination. When the controller observed the flight track turn approximately 45 degrees to the right and headed generally northwest, he attempted to contact the pilot without a response. The tracking then turned about 90 degrees to the left for a few minutes, then turned 180 degrees to the right. The aircraft dropped from radar coverage shortly thereafter. On site investigation revealed that the aircraft broke-up in flight as the wreckage was scattered generally east-to-west over the mountainous terrain for approximately .3 nautical miles. Further investigation revealed that the right wing separated at the wing root in an upward direction. Separation points indicated features typical of overload. The right side horizontal stabilizer separated upward and aft. The left side horizontal stabilizer remained attached however, it was twisted down and aft. The aft fuselage was twisted to the left. Both engines separated in flight from the wings. Post-crash examinations of the airframe and engines did not reveal evidence of a mechanical failure or malfunction. Both altimeters were too badly damaged to test. Autopsy and toxicology results indicated that the pilot had severe coronary artery disease with greater than 95% narrowing of the left anterior descending coronary artery by atherosclerotic plaque. The coroner also reported that superimposed upon this severe narrowing was complete occlusion of the lumen by brown thrombus. Toxicology results indicated a moderate level of diabetes. The pilot's actions leading up to the accident were consistent with an incapacitation due to hypoxia. The role of a possible heart attack was unclear, since it is possible that it occurred as a result of the hypoxia.
Probable cause:
The pilot's failure to maintain aircraft control while in cruise flight which resulted in the in-flight separation due to overload of the spar at the right wing root. Hypoxia was a factor.
Final Report:

Crash of a Mitsubishi MU-2B-60 Marquise in Lewiston: 1 killed

Date & Time: Feb 11, 2000 at 0815 LT
Type of aircraft:
Registration:
N152BK
Flight Type:
Survivors:
No
Schedule:
Boise – Lewiston
MSN:
1537
YOM:
1982
Flight number:
BKJ152
Location:
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Captain / Total flying hours:
21000
Captain / Total hours on type:
1500.00
Aircraft flight hours:
5460
Circumstances:
The airplane impacted a ridgeline about 1.5 miles from the runway and approximately 7 to 14 seconds after the pilot reported a dual engine flameout. The airplane's altitude was about 400 feet agl when the pilot reported the flameout. The inspection of the airplane revealed no preexisting anomalies. Icing conditions were forecast and PIREPS indicated that light to moderate rime/mixed icing conditions existed along the route of flight. The Continuous Ignition switches were found in the OFF position. The Approach procedures listed in the Airplane's Flight Manual stated, 'CONTINUOUS IGNITION SHALL BE SELECTED TO ON DURING APPROACH AND LANDING WHILE IN OR SHORTLY FOLLOWING FLIGHT IN ACTUAL OR POTENTIAL ICING CONDITIONS.' The aircraft manufacturer had issued a Service Bulletin in 1995 for the installation of an auto-ignition system to '... reduce the possibility of engine flame-out when icing conditions are encountered and the continuous ignition is not selected.' The operator had not installed the non-mandatory service bulletin. On May 5, 2000, the FAA issued an Airworthiness Directive that required the installation of an auto-ignition system. The toxicology test detected extremely high levels of dihydrocodeine in the pilot's blood. The pilot received a special issuance second-class medical certificate on August 22, 1995, after receiving treatment for a self disclosed history of drug abuse. The drug testing that this pilot underwent as a consequence of his previous self disclosed history of drug abuse would not have detected these substances.
Probable cause:
The pilot failed to follow the flight manual procedures and did not engage the Continuous Ignition system resulting in both engines flaming out when the air induction system was blocked with ice. Additional factors to the accident included the hilly terrain, the icing conditions, and the operator not complying with a Service Bulletin for the installation of an auto-ignition system.
Final Report:

Crash of a Dassault Falcon 20DC in Boise

Date & Time: Nov 27, 1999 at 0134 LT
Type of aircraft:
Operator:
Registration:
N216SA
Flight Type:
Survivors:
Yes
Schedule:
Omaha - Boise
MSN:
16
YOM:
1966
Location:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
19519
Captain / Total hours on type:
341.00
Aircraft flight hours:
28855
Circumstances:
After extending the gear for landing, the down-and-locked indication (green light) for the left main gear was not illuminated. The crew performed the emergency checklist procedures for abnormal gear extension with no success. The aircraft subsequently landed with the left main landing gear retracted. Inspection of the landing gear revealed that the pin (part number MY20248-001), which is part of the forward gear door lock, was corroded and cracked at the point of rotation, preventing proper movement of the gear door uplock.
Probable cause:
Failure of the forward gear door lock pin. An inoperative landing gear door and inadequate maintenance inspection of the aircraft were factors.
Final Report:

Crash of a Cessna T303 Crusader in Midvale: 6 killed

Date & Time: Mar 2, 1998 at 1805 LT
Type of aircraft:
Registration:
N727RT
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Boise - Boise
MSN:
303-00090
YOM:
1981
Location:
Crew on board:
1
Crew fatalities:
Pax on board:
5
Pax fatalities:
Other fatalities:
Total fatalities:
6
Captain / Total flying hours:
7743
Captain / Total hours on type:
319.00
Aircraft flight hours:
1675
Circumstances:
Radar data indicated that the aircraft completed a figure-eight maneuver at about 3,000 feet AGL, with an estimated airspeed of 140 knots and approximate 40 degree bank angle before leveling out at the completion of the maneuver. The radar data then indicated level flight before a rapid descent. A witness reported observing the aircraft in visual conditions and flying at a high altitude and that it 'appeared fast.' The witness stated that he observed the aircraft make a wide, shallow left turn, then turn back the other way. The nose of the aircraft then started to gradually lower, and the airplane eventually came straight down and started to spin. The witness lost sight of the airplane behind hilly terrain and he did not see the impact. Postaccident examination of the wreckage indicated that the aircraft collided with the terrain in a slight nose-down attitude, located in a gully with approximate 30 degree bank angle. The aircraft then slid downhill to the right and came to rest with the fuselage upright and the empennage was twisted to the right and inverted. No evidence was found to indicate a mechanical failure or malfunction.
Probable cause:
The pilot's failure to maintain aircraft control.
Final Report:

Crash of a Douglas C-47A-1-DL in Boise: 2 killed

Date & Time: Dec 9, 1996 at 1803 LT
Operator:
Registration:
N75142
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Boise – Salt Lake City
MSN:
9173
YOM:
1943
Location:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
15447
Captain / Total hours on type:
5502.00
Aircraft flight hours:
34124
Circumstances:
The DC-3C took off on runway 10L and immediately executed a right turn followed by a left turn back toward the airport declaring a fire aboard. Dark night visual meteorological conditions existed. Witnesses observed 'flames' or an 'orange glow' coming from the right engine. A small number of aluminum fragments identified from the aft edge of the right engine accessory cowling were found along the ground just short of the ground impact site. These fragments displayed signs of heat distress but no significant melting. An examination of the right engine and accessory section revealed no evidence of a preimpact fire, and sooting and metal splatter on the leading edge of the right horizontal stabilizer was minimal. Spectral analysis of radio transmissions revealed no evidence of significant divergence of engine RPM between the two engines. Postcrash propeller examination revealed approximate blade pitch angles of 18-19° and 30-32° for the right and left propellers respectively upon impact. Propeller slash mark dimensions associated with the right propeller resulted in propeller RPM of approximately 1,750 to 2,570 over a range of 68 to 100 knots respectively. The first officer advised the PIC (broadcasting over the tower frequency) 'we're gonna stall' approximately 10 seconds before the impact. The aircraft was in a left turn back toward runways 28 left and right when the right wing struck the ground and the aircraft cartwheeled to a stop. A postcrash fire destroyed the cockpit area and inboard right wing.
Probable cause:
A fire within the right engine compartment of undetermined cause and the pilot-in-command's failure to maintain airspeed above the aircraft's minimum control speed. A factor contributing to the accident was the dark night environmental conditions.
Final Report:

Crash of a Lockheed C-130E Hercules near Bliss: 6 killed

Date & Time: May 13, 1995
Type of aircraft:
Operator:
Registration:
62-1838
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Boise - Colorado Springs
MSN:
3801
YOM:
1963
Flight number:
Sumit 38
Location:
Crew on board:
6
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
6
Circumstances:
After departure from Boise-Gowen Field, en route to Peterson AFB in Colorado Springs, the crew encountered technical problems with the engine n°2. The crew declared an emergency and elected to divert to Mountain Home AFB. About 20 minutes into the flight, the engine n°2 compressor disintegrated. The aircraft entered an uncontrolled descent and crashed 12 miles north of Bliss. All six crew members were killed.
Crew:
Lt Col Robert Buckout, Commander
1st Lt Lance Daugherty, pilot,
Cpt Geoffery Boyd, navigator,
CMSgt Jimmy Vail, flight engineer,
M/Sgt Jay Kemp, loadmaster,
S/Sgt Michael Scheideman, loadmaster.
Probable cause:
The cause of the crash was that the number 2 (inside left wing) engine had a buggy undertemp sensor, causing the crew to enrich the fuel mixture, leading to an actual engine overtemp. One of the fuel lines ruptured or melted, causing the fire, and one of the crewmen hit the fire carts, but the fire re-erupted moments later, and there were no more extinguishers available for that engine. One of the pins that was supposed to melt in an engine fire, releasing the engine from the AC, failed to release the engine properly, while another worked properly. Still half connected to the wing hard point, the engine torqued at an awkward angle, causing severe wing and fuselage damage, which led to the crash.

Crash of a Piper PA-46-310P Malibu in Mountain Home: 1 killed

Date & Time: Nov 22, 1993 at 0111 LT
Registration:
N84PM
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Twin Falls - Boise
MSN:
46-8408004
YOM:
1984
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Captain / Total flying hours:
1915
Captain / Total hours on type:
457.00
Circumstances:
The pilot had been charged with 'lewd and lascivious conduct with a minor.' He was jailed on Friday and released on bond on Saturday. During a meeting with a friend in the pilot's car on Sunday evening, he was drinking beer. The friend said the pilot made comments referring to intentionally crashing the aircraft and that 'he didn't want to die, but didn't know of any other way.' He had a gun in the car and told the friend 'don't call the police or I'll kill myself sooner.' The pilot departed Twin Falls at about 2230 on Sunday night in his PA-46. He flew to Boise, ID (via Ely, NV) before turning back toward Twin Falls. After passing over Boise, intermittent radio contact was made between the airplane and approach control. Radar vectors and descent were issued. Radar contact was lost during descent and pilot announced descending thru 11,000 feet; 38 seconds later, he reported at 6,000 feet. Ground impact was at 4,650 feet. Toxicology tests of the pilot's lung and muscle tissue showed an alcohol level of 175 & 117 mg/dl (0.175% & 0.117%). No preimpact failure of the aircraft was found.
Probable cause:
The pilot's intentional suicide and impairment from consumption of alcohol.
Final Report:

Crash of a Convair CV-240 in Boise

Date & Time: Jul 27, 1993 at 1317 LT
Type of aircraft:
Registration:
N156PA
Flight Type:
Survivors:
Yes
Schedule:
Boise - Boise
MSN:
324
YOM:
1953
Location:
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Captain / Total flying hours:
2128
Captain / Total hours on type:
1400.00
Copilot / Total hours on type:
1
Circumstances:
Left seat pilot was receiving a flight check for ATP and CV-240 type rating; right seat pilot was FAA OPS inspector. Following a simulated single-engine approach the airplane landed wheels up. Left seat pilot had received a total of 1.4 hrs left seat training in CV-240 prior to this flight; log book not endorsed.
Probable cause:
The pilot's failure to extend the landing gear, and the check pilot's inadequate supervision. A factor in the accident was the pilot's inadequate upgrade training by the company.
Final Report:

Crash of a Cessna 402B in Boise: 2 killed

Date & Time: Nov 16, 1991 at 0256 LT
Type of aircraft:
Registration:
N29517
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Boise - Pocatello
MSN:
402B-0031
YOM:
1970
Location:
Crew on board:
1
Crew fatalities:
Pax on board:
1
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
3864
Captain / Total hours on type:
450.00
Aircraft flight hours:
6994
Circumstances:
The pilot announced he had an engine failure during initial climb at 300-400 feet agl after takeoff on a VFR night cargo flight. The tower controller cleared the flight to return to the airport and land on any runway. The aircraft entered a right descending turn, impacted the ground one mile from the airport, and ignited in flames. Evidence indicated the right engine was not operating at impact. The landing gear was down and the right propeller was in the high pitch position. Exam of the right engine revealed blocked fuel injectors, incorrect size fuel injectors, fuel pump out of adjustment, and burned/pitted breaker points in a magneto. Both occupants were killed.
Probable cause:
The loss of power on the right engine during initial climb after takeoff due to inadequate maintenance inspection and adjustment of the engine by company maintenance personnel, and the loss of control by the pilot due to his failure to properly configure the aircraft and perform a proper single engine climb maneuver, and his failure to maintain single engine climb airspeed. A factor relating to the accident was the dark night light conditions.
Final Report:

Crash of a Douglas DC-9-14 in Denver: 28 killed

Date & Time: Nov 15, 1987 at 1415 LT
Type of aircraft:
Operator:
Registration:
N626TX
Flight Phase:
Survivors:
No
Schedule:
Denver - Boisé
MSN:
45726
YOM:
1966
Flight number:
CO1713
Crew on board:
5
Crew fatalities:
Pax on board:
77
Pax fatalities:
Other fatalities:
Total fatalities:
28
Captain / Total flying hours:
12125
Captain / Total hours on type:
133.00
Copilot / Total flying hours:
3186
Copilot / Total hours on type:
36
Aircraft flight hours:
42184
Aircraft flight cycles:
54759
Circumstances:
Weather conditions were moderate snow and freezing temperatures. Following a 27 minute delay between deicing and departure, on takeoff the aircraft was over-rotated by the first officer. Aircraft control was lost, the aircraft stalled and impacted off the right side of the runway. Company procedures called for repeat deicing when in icing conditions if a delay exceeds 20 minutes. Confusion between the tower and the flight crew due to procedural errors resulted in the delayed takeoff clearance. Both pilots were inexperienced in their respective crew positions. The captain had 33 hours experience as a DC-9 captain. The first officer had 36 hours jet experience, all in the DC-9. First officer demonstrated weak scan in training and had pilot performance problems with previous employers. First officer was on reserve, and had not flown for 24 days. The trip was assigned to the first officer for proficiency. Flight was first officer's 2nd trip as DC-9 first officer. Wing vortices from a landing aircraft on a parallel runway were not a factor in the accident.
Probable cause:
The captain's failure to have the airplane de-iced a second time after delay before take-off that led to upper wing surface contamination and a loss of control during rapid take-off rotation by the first officer.
Contributing was the absence of regulatory or management controls governing operations by newly qualified flight crew members and the confusion that existed between the flight crew and air traffic controllers that led to the delay in departure.
Final Report: