Piper PA-31-350 Navajo Chieftain | Bureau of Aircraft Accidents Archives

At 1817 Central Daylight Time, the Keystone Air Service Ltd. Piper PA-31-350 (registration C-FXLO, serial number 31-8052022) departed Runway 06 at Thompson Airport, Manitoba, on an instrument flight rules flight to Winnipeg/James Armstrong Richardson International Airport, Manitoba, with 2 pilots and 6 passengers on board. Shortly after rotation, both engines began to lose power. The crew attempted to return to the airport, but the aircraft was unable to maintain altitude. The landing gear was extended in preparation for a forced landing on a highway southwest of the airport. Due to oncoming traffic, the forced landing was conducted in a forested area adjacent to the highway, approximately 700 metres south of the threshold of Runway 06. The occupants sustained varying serious injuries but were able to assist each other and exit the aircraft. The emergency locator transmitter activated, and there was no fire. Emergency services were activated by a 911 call and by the Thompson flight service station. Initial assistance was provided by sheriffs of the Manitoba Department of Justice after a crew member flagged down their vehicle on the highway.

Probable cause:

Findings as to causes and contributing factors:
1. Delivery of the incorrect type of aircraft fuel caused loss of power from both engines, necessitating a forced landing.
2. The fueling operation was not adequately supervised by the flight crew.
3. A reduced-diameter spout was installed that enabled the delivery of Jet-A1 fuel into the AVGAS fuel filler openings.
4. The fuel slip indicating that Jet-A1 fuel had been delivered was not available for scrutiny by the crew.

Findings as to risk:
1. If administrative and physical defences against errors in aviation fuel operations are circumvented or disabled, there is a risk that the incorrect type of fuel will be delivered.
2. If a reduced-diameter spout is available to accommodate non-standard fuel filler openings, there is an increased risk that Jet-A1 fuel can be dispensed into an aircraft that requires AVGAS.

Other findings:
1. Aircraft that were manufactured prior to the current airworthiness standards, or that have been modified by the installation of turbine engines, may have fuel filler openings that do not meet the dimension requirements.
2. The airworthiness standards for rotorcraft do not specify the size of fuel filler openings.
3. The use of all of the available restraint systems in the aircraft contributed to the survival of the occupants.
4. There was no post-crash fire, likely due to the separation of the battery from the aircraft and to the rain-saturated crash site.
5. The absence of a post-impact fire contributed to the survival of all of the aircraft's occupants.

Final Report:

Crash of a Piper PA-31-350 Navajo Chieftain in Mariquita: 10 killed

Date & Time: Dec 3, 2014 at 0931 LT

Type of aircraft:

Piper PA-31-350 Navajo Chieftain

Operator:

Registration:

HK-4464

Flight Phase:

Landing (descent or approach)

Flight Type:

Charter/Taxi (Non Scheduled Revenue Flight)

Survivors:

Site:

Airport (less than 10 km from airport)

Schedule:

Bogotá-Guaymaral – Bahía Solano

MSN:

31-7952229

YOM:

1979

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Captain / Total flying hours:

2190

Captain / Total hours on type:

392.00

Copilot / Total flying hours:

302

Copilot / Total hours on type:

302

Aircraft flight hours:

10091

Circumstances:

The twin engine aircraft departed Bogotá-Guaymaral Airport on a charter flight to Bahía Solano, carrying eight passengers and two pilots. En route, while in cruising altitude, the crew contacted ATC and reported engine trouble. He was then cleared to divert to Mariquita-José Celestino Mutis Airport for an emergency landing. On final approach to runway 19, the aircraft stalled and crashed on hilly and wooded terrain, bursting into flames. The aircraft was totally destroyed by impact forces and a post crash fire and all 10 occupants were killed.

Probable cause:

The accident was the consequence of the malfunction of the right engine in flight, causing a loss of speed and a subsequent stall.
The following contributing factors were identified:
- Limited operation of the aircraft due to an inoperative engine,
- Low speed,
- When the aircraft stalled, the distance with the ground was insufficient to expect recovery,
- The maintenance services were not performed according to the manufacturer when the aircraft was parked for almost six months.

Final Report:

Crash of a Piper PA-31-350 Navajo Chieftain off Nassau: 1 killed

Date & Time: Dec 2, 2014 at 0845 LT

Type of aircraft:

Piper PA-31-350 Navajo Chieftain

Operator:

Registration:

C6-REV

Flight Phase:

Flight

Flight Type:

Charter/Taxi (Non Scheduled Revenue Flight)

Survivors:

Yes

Site:

Lake, Sea, Ocean, River

Schedule:

Governor’s Harbour – Nassau

MSN:

31-7652062

YOM:

1976

Flight number:

302

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Captain / Total flying hours:

7650

Aircraft flight hours:

11744

Circumstances:

On Tuesday December 2nd, 2014 at approximately 8:45 am (1345Z) a Ferg’s Air Limited, Piper PA-31-350 Navajo aircraft, registration C6-REV, operated as Southern Air Limited Flight 302, ditched in waters approximately 6nm from shore in the southwestern district of New Providence. The flight originated at Governor’s Harbour, Eleuthera (MYEM) with 10+1 persons on board at approximately 8:15 am in Visual Meteorological Conditions (VMC). At around 8:30am, the aircraft 15 nautical miles east of Lynden Pindling International Airport at 4,500 feet contacted Nassau Air Traffic Control Tower. The aircraft was instructed that runway 09 was in use and they can expect a landing on that runway. Upon final approach to runway 09, with the landing gears selected to the “EXTEND” position, only the nose and right main landing gear lights indicated the “down and locked” position. The left main landing gear light did not illuminate to indicate the “down and locked” position, so the landing was aborted and the pilot requested to go around so he could recycle and troubleshoot the landing gear issue. The pilot made a left turn, flew over the north western shoreline and recycled the landing gears a few times and also tried the emergency hand pump in an attempt to extend the gear. Despite all efforts, the left main landing gear light still did not illuminate to indicated the gear was in the safe “down and locked” position. At this time the aircraft was allowed to fly by the tower so that the controller may make a visual check of the landing gears to see if they were in the extended position. The controller advised the pilot that all gears “appeared to be extended”. Once again the pilot proceeded outbound to make another attempt for landing. For this approach the pilot made a right turn over the southwestern shoreline and proceeded downwind to runway 09. While on the downwind to runway 09 the pilot stated he began to experience problems with the right engine. The engine eventually stopped and all attempts to restart were unsuccessful. As a result of single engine operation, level flight could not be maintained even after retracting the gears and cleaning up the airplane. The decision was made by the pilot to ditch in the water vs. attempting to make the airport where numerous trees and obstacles would make the landing more difficult if the runway could not be made. After touching down on the water the most of the occupants were able to evacuate the aircraft through the normal and emergency exits before the aircraft sank into the ocean. One passenger died during the process. Witness stated that “the plane skipped across the water three times before rotating and hitting with a severe impact. The port (left) tail section received the bulk of the impact as did the port side of the plane.” Eye witness further stated that the passenger that died and “luggage from the baggage compartment were ejected from the rear of the plane on the port side.” “Multiple passengers could not swim or were extremely limited in their ability to swim.” Despite the plane having the full complement of survival equipment (life vests), only two were taken out of the aircraft. Passengers were holding on to bags and other debris that floated out of the aircraft as it submerged. Passengers helped each other until rescuers arrived to assist. Estimates from eye witness were that “the entire plane disappeared under water from 30 to 60 seconds after impact.” The depth where the aircraft came to rest on the water was reported as in excess of 6,500 feet. Once the aircraft settled, it submerged and was not able to be recovered. Safety concerns raised by eye witness could not be confirmed as the plane was never recovered.

Probable cause:

The AAIPU determines that the probable causes of this accident as:
- Engine failure and the inability of the aircraft to maintain a safe altitude.
Contributing Factors includes:
- Failure of the left main landing gear.
The following findings were identified:
1. Weather was not a factor in the accident.
2. Air Traffic Services were proper and did not contribute to the cause of the accident.
3. The pilot was properly certified, trained and qualified for the flight.
4. The loss of power on the right engine resulted in the aircraft inability to maintain a safe altitude.
5. The Police and other emergency services response were timely and effective.
6. The depth of the water where the aircraft came to rest made it impossible for the aircraft to be recovered.
7. The aircraft was properly maintained in accordance with Bahamas and United States regulations and maintenance practices.

Final Report:

Crash of a Piper PA-31-350 Navajo Chieftain in Araracuara: 10 killed

Date & Time: Sep 6, 2014 at 1505 LT

Type of aircraft:

Piper PA-31-350 Navajo Chieftain

Operator:

Registration:

HK-4755

Flight Phase:

Takeoff (climb)

Flight Type:

Charter/Taxi (Non Scheduled Revenue Flight)

Survivors:

Site:

Airport (less than 10 km from airport)

Schedule:

Araracuara – Florencia

MSN:

31-7952044

YOM:

1979

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Captain / Total flying hours:

792

Captain / Total hours on type:

523.00

Copilot / Total flying hours:

211

Aircraft flight hours:

14601

Circumstances:

The twin engine aircraft departed Araracuara Airport runway 09 at 1503LT on a charter flight to Florencia, carrying eight passengers and two pilots. During initial climb, the right engine failed. The crew lost control of the airplane that stalled and crashed in a wooded area. The wreckage was found 8,2 km from the airport. The airplane disintegrated on impact and all 10 occupants were killed, among them a Swiss citizen.

Probable cause:

Loss of control during initial climb following the failure of the right engine for undetermined reasons.
The following contributing factors were identified:
- The crew failed to follow the published procedures when the right engine failed,
- The aircraft was likely operated with a total weight above MTOW,
- A poor risk assessment while performing an operation outside of the aircraft's performance limits.

Final Report:

N257SH

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N257SH

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N748CE

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N257SH

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N36BM

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Crash of a Piper PA-31-350 Navajo Chieftain in Stonehaven

Date & Time: Apr 9, 2014 at 1447 LT

Type of aircraft:

Piper PA-31-350 Navajo Chieftain

Operator:

Registration:

N66886

Flight Phase:

Flight Type:

Survivors:

Site:

Schedule:

Wick – Le Touquet

MSN:

31-7405188

YOM:

1974

Location:

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Captain / Total flying hours:

3188

Captain / Total hours on type:

19.00

Circumstances:

The aircraft was on a ferry flight from Seattle in the USA to Thailand via Canada, Greenland, Iceland, Scotland and across Europe. However the flight crew abandoned the aircraft in Greenland late in December 2013 after experiencing low oil pressure indications on both engines. This may have been due to the use of an incorrect grade of oil for cold weather operations. The aircraft remained in Greenland until 28 February 2014, when a replacement ferry pilot was engaged. Although the engine oil was not changed prior to departing Greenland, the flight continued uneventfully to Wick, in Scotland. Following some maintenance activity on the right engine, the aircraft departed for Le Touquet in France. However, approximately 25 minutes after takeoff, the engines successively lost power and the pilot carried out a forced landing in a ploughed field. Examination of the engines revealed that one piston in each engine had suffered severe heat damage, consistent with combustion gases being forced past the piston and into the crankcase.

Probable cause:

The aircraft began experiencing engine problems, leading to the forced landing, approximately 25 minutes after departing Wick, in Scotland. However, it is possible that these problems may have originated prior to the aircraft arriving in the UK. The low oil pressures in both engines, reported by the crew on the flight leg to Greenland, may have been due to the wrong grade of oil, W100, being used in what would have been very low temperatures experienced in December in Canada and Greenland. Despite supplies of multigrade oil being sent to Greenland, the engine oil was not changed. This was due to the fact that the pilot noted normal engine indications combined with the lack of maintenance facilities. Thus the aircraft continued its journey with the same oil in the engines with which it left Seattle; this was confirmed by the subsequent analysis of the oil. No further oil pressure problems were observed, although it is likely the aircraft would have been operating in warmer temperatures at the end of February in comparison with those in December. The engine manufacturer suggested that engine damage could have occurred as a result of operating the engines at low temperatures with the wrong grade of oil. Whilst this may have been the case, it is surprising that any damage did not progress to the point where it became readily apparent during the subsequent flights, via Iceland, to Wick. In fact the pilot did report rough running of the right-hand engine, but the investigation revealed a problem only with the No 4 cylinder compression, which led to replacement of this cylinder. Since the compressions in all the cylinders were presumably assessed during the diagnosis, it must be concluded that any damage in the No 3 cylinder of the right engine was not, at that stage, significant. Ultimately, it was not possible to establish why pistons in both engines had suffered virtually identical types of damage, although it is likely to have been a ‘common mode’ failure, which could include wrong fuel, incorrect mixture settings (running too lean) and existing damage arising from the use of incorrect oil in cold temperatures. The oil analysis excluded the possibility of the aircraft having been mis-fuelled with Jet A-1 at Wick. No conclusion can be drawn regarding the possibility of one of the pilots having leaned the mixtures to an excessive degree, although this would require that either high cylinder head temperature indications were ignored, or that the temperature gauges (or sensors) on both engines were defective. The engines would have begun to fail when the combustion gases started to ‘blow by’ the pistons, causing progressive damage to the piston crowns, skirts and rings. This would have also caused pressurisation of the crankcases, which in turn would have tended to blow oil out of the crankcase breathers. In the case of the left engine, the pressurisation was such that the dipstick was blown out of its tube, resulting in more oil being lost overboard. This may have accounted for the more severe damage to the left engine, having lost more oil than the right. The detached No 1 cylinder base jet oil nozzle in the left engine may have contributed to a slight reduction in the oil pressure, but is otherwise considered to have played no part in the engine failure.

Final Report:

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