Crash of a Boeing 737-3B7(SF) in Honiara

Date & Time: Jan 26, 2014 at 1259 LT
Type of aircraft:
Operator:
Registration:
ZK-TLC
Flight Type:
Survivors:
Yes
Schedule:
Brisbane – Honiara
MSN:
23705/1497
YOM:
1988
Flight number:
PAQ523
Region:
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
Following an uneventful flight from Brisbane, the crew completed the approach and landing at Honiara-Henderson Airport. After touchdown on runway 24, the right main gear collapsed and punctured the right wing. The aircraft veered slightly to the right and came to a halt on the runway. All three occupants evacuated safely and the aircraft was damaged beyond repair.
Probable cause:
The failure of the right main gear was the consequence of an inappropriate rework (ie, machining and re-threading) of the tee-bolt fitting and the associated installation of a reduced size nut and washer, during the last overhaul in 2004.

Crash of a Piper PA-31 Cheyenne in Bankstown: 2 killed

Date & Time: Jun 15, 2010 at 0805 LT
Type of aircraft:
Operator:
Registration:
VH-PGW
Flight Phase:
Flight Type:
Survivors:
No
Site:
Schedule:
Bankstown - Brisbane - Albury
MSN:
31-8414036
YOM:
1984
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
1
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
2435
Captain / Total hours on type:
779.00
Aircraft flight hours:
6266
Circumstances:
The twin engine aircraft, with a pilot and a flight nurse on board, was being operated by Skymaster Air Services under the instrument flight rules (IFR) on a flight from Bankstown Airport, New South Wales (NSW) to Archerfield Airport, Queensland. The aircraft was being positioned to Archerfield for a medical patient transfer flight from Archerfield to Albury, NSW. The aircraft departed Bankstown at 0740 Eastern Standard Time. At 0752, the pilot reported to air traffic control (ATC) that he was turning the aircraft around as he was having ‘a few problems. At about 0806, the aircraft collided with a powerline support pole located on the eastern side of the intersection of Sackville Street and Canley Vale Road, Canley Vale, NSW. The pilot and flight nurse sustained fatal injuries and the aircraft was destroyed by impact damage and a post-impact fire.
Probable cause:
Contributing safety factors:
• While the aircraft was climbing to 9,000 feet the right engine sustained a power problem and the pilot subsequently shut down that engine.
• Following the shutdown of the right engine, the aircraft's descent profile was not optimized for one engine inoperative flight.
• The pilot conducted a descent towards Bankstown Airport that was consistent with a normal arrival profile without first verifying that the aircraft was capable of achieving adequate performance with one engine inoperative.
• Following the engine problem, the aircraft's flightpath and the pilot’s communication with air traffic control indicated that the pilot's situation awareness was less than optimal.
• The aircraft collided with a powerline support pole on the eastern side of the intersection of Sackville Street and Canley Vale Road, Canley Vale, about 6 km north-west of Bankstown Airport.
Other safety factors:
• The pilot did not broadcast a PAN following the engine shutdown and did not provide air traffic control with further information about the nature of the problem in order for the controller to positively establish the severity of the situation.
• Section 4 of Civil Aviation Advisory Publication (CAAP) 5.23-2(0), Multi-engine Aeroplane Operations and Training of July 2007 did not contain sufficient guidance material to support the flight standard in Appendix A subsection 1.2 of the CAAP relating to Engine Failure in the Cruise. [Minor safety issue]
Other key finding:
• Given the pilot’s extensive experience and testing in the PA-31 aircraft type, and subsequent endorsement training on a high performance turboprop multi-engine aircraft since the issue by CASA in 2008 of a safety alert in respect of the pilot’s PA-31 endorsement, it was unlikely that any deficiencies in that endorsement training contributed to the accident.
Final Report:

Crash of a Swearingen SA227AC Metro III off Sydney: 1 killed

Date & Time: Apr 9, 2008 at 2327 LT
Type of aircraft:
Operator:
Registration:
VH-OZA
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Sydney – Brisbane
MSN:
AC-600
YOM:
1984
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Captain / Total flying hours:
4873
Captain / Total hours on type:
175.00
Aircraft flight hours:
32339
Aircraft flight cycles:
46710
Circumstances:
On 9 April 2008, at 2325 Eastern Standard Time, a Fairchild Industries Inc. SA227-AC (Metro III) aircraft, registered VH-OZA, departed Sydney Airport, New South Wales on a freight charter flight to Brisbane, Queensland with one pilot on board. The aircraft was subsequently observed on radar to be turning right, contrary to air traffic control instructions to turn left to an easterly heading. The pilot reported that he had a ‘slight technical fault’ and no other transmissions were heard from the pilot. Recorded radar data showed the aircraft turning right and then left, followed by a descent and climb, a second right turn and a second descent before radar returns were lost when the aircraft was at an altitude of 3,740 ft above mean sea level and descending at over 10,000 ft/min. Air traffic control initiated search actions and search vessels later recovered a small amount of aircraft wreckage floating in the ocean, south of the last recorded radar position. The pilot was presumed to be fatally injured and the aircraft was destroyed. Both of the aircraft’s on-board flight recorders were subsequently recovered from the ocean floor. They contained data from a number of previous flights, but not for the accident flight. There was no evidence of a midair breakup of the aircraft.
Probable cause:
Contributing Safety Factors:
- It was very likely that the aircraft’s alternating current electrical power system was not energised at any time during the flight.
- It was very likely that the aircraft became airborne without a functioning primary attitude reference or autopilot that, combined with the added workload of managing the ‘slight technical fault’, led to pilot spatial disorientation and subsequent loss of control.
Other Safety Factors:
- The pilot’s Metro III endorsement training was not conducted in accordance with the operator’s approved training and checking manual, with the result that the pilot’s competence and ultimately, safety of the operation could not be assured. [Significant safety issue].
- The chief pilot was performing the duties and responsibilities of several key positions in the operator’s organisational structure, increasing the risk of omissions in the operator’s training and checking requirements.
- The conduct of the flight single-pilot increased the risk of errors of omission, such as not turning on or noticing the failure of aircraft items and systems, or complying with directions.
Final Report:

Crash of a Piper PA-31-350 Navajo Chieftain near Condobolin: 4 killed

Date & Time: Dec 2, 2005 at 1350 LT
Registration:
VH-PYN
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Brisbane – Swan Hill
MSN:
31-8252075
YOM:
1982
Country:
Region:
Crew on board:
2
Crew fatalities:
Pax on board:
2
Pax fatalities:
Other fatalities:
Total fatalities:
4
Captain / Total flying hours:
4600
Captain / Total hours on type:
1000.00
Aircraft flight hours:
2900
Circumstances:
On 2 December 2005, at 1122 Eastern Daylight-saving Time, a Piper Aircraft Corporation PA-31-350 Chieftain aircraft, registered VH-PYN (PYN), departed Archerfield, Qld, on a private flight to Griffith, NSW. The flight was planned under the instrument flight rules (IFR). On board the aircraft were the pilot, two passengers and an observer-pilot who was on the flight to gain knowledge of the aircraft operation. The aircraft tracked direct to Moree and then Coonamble at 10,000 ft, in accordance with the flight plan. At 1303, the pilot amended the destination to Swan Hill, Vic, tracking via Hillston, NSW. At 1314, the pilot advised air traffic control that the aircraft had passed overhead Coonamble at 1312 maintaining 10,000 ft, and was estimating Hillston at 1418. At 1316, the pilot reported that he was tracking 5 NM (9 km) left of track due to weather. At 1337, the pilot advised that he was diverting up to 20 NM (37 km) left of track due to weather. At 1348, the pilot reported that he was diverting 29 NM (54 km) left of track, again due to weather. No further radio transmission from the pilot was heard. At about 1400, police received a report that an aircraft had crashed on a property approximately 28 km north of Condobolin, NSW. The extensively burned wreckage was subsequently confirmed as PYN. Other wreckage, spread along a trail up to 4 km from the main wreckage, was located the following day. Examination of air traffic control recorded radar data indicated that the aircraft entered radar coverage about 50 km north of Condobolin at 1346:34. The last valid radar data from the secondary surveillance radar located on Mount Bobbara was at 1349:53. During that 3 minute 19 second period, the recorded aircraft track was approximately 56 km left of the Coonamble to Hillston track and showed a change in direction from southerly to south-westerly. The aircraft’s groundspeed was in the range between 200 and 220 kts. The aircraft’s altitude remained steady at 10,000 ft. The last recorded radar position of the aircraft was approaching the limit of predicted radar coverage and was within 10 km of the location of the main aircraft wreckage. Earlier that day, the aircraft had departed Bendigo, Vic, at 0602 and arrived at Archerfield at 1034. The pilot and the observer-pilot were on board. The aircraft was refuelled to full tanks with 314 litres of aviation gasoline at Archerfield. The refuelling agent reported that the main and auxiliary tanks were full at the completion of refuelling. He also reported that the pilots had commented that the forecast for their return flight indicated that weather conditions would be ‘patchy’.
Probable cause:
Contributing factors:
• A line of thunderstorms crossed the aircraft’s intended track.
• The aircraft was operating in the vicinity of thunderstorm cells.
• In circumstances that could not be determined, the aircraft’s load limits were exceeded, causing structural failure of the airframe.
Other safety factors:
• Air traffic control procedures, did not require the SIGMET information to be passed to the aircraft.
• There were shortcomings in the Airservices Australia Hazard Alert procedures and guidelines for assessing SIGMET information.
• Air traffic control procedures for the dissemination of SIGMET information contained in the Aeronautical Information Publication were inconsistent with procedures contained in International Civil Aviation Organization (ICAO) Doc. 4444 and ICAO Doc. 7030.
Other key findings:
• The aircraft was not equipped with weather radar or lightning strike detection systems.
• The pilot did not make any request for additional information regarding the weather to air traffic services.
• The pilot in command was occupying the right cockpit seat and the observer- pilot the left cockpit seat at the time of the breakup, but that arrangement was not considered to have influenced the development of the accident.
Final Report:

Crash of an Antonov AN-12BP in Honiara

Date & Time: Oct 16, 2001
Type of aircraft:
Operator:
Registration:
ER-ADT
Flight Type:
Survivors:
Yes
Schedule:
Brisbane - Honiara
MSN:
2 3 406 05
YOM:
1962
Region:
Crew on board:
6
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
Following an uneventful cargo flight from Brisbane, the crew started the approach to Honiara-Henderson Airport. On final approach, the four engine airplane was too low when the right main gear struck the sea and was torn off. The crew increased engine power, continued the approach and completed the landing on runway 24. After touchdown, the aircraft went out of control, veered off runway at high speed and came to rest. All six occupants escaped uninjured while the aircraft was damaged beyond repair.

Crash of a Piper PA-31-310 Navajo near Brisbane: 1 killed

Date & Time: Jul 20, 1993 at 1546 LT
Type of aircraft:
Operator:
Registration:
VH-UFO
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Brisbane – Caboolture
MSN:
31-7712060
YOM:
1977
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Captain / Total flying hours:
531
Captain / Total hours on type:
35.00
Circumstances:
The aircraft, with only the pilot on board, was being flown from Archerfield to Caboolture via the light aircraft lane to the west of Brisbane in company with another aircraft. About five minutes after departing Archerfield, the pilot radioed that he was experiencing problems with both engines and that he was in an emergency situation. The pilot of the other aircraft advised him that there were suitable forced landing areas in and around a nearby golf course. However, the aircraft continued and slowly lost altitude before rolling inverted and diving steeply into the ground. Ground witnesses reported hearing loud backfiring and fluctuating engine RPM from the aircraft. These sounds were accompanied by erratic rolling and yawing of the aircraft before it rolled to the left and inverted. The right wing was severed outboard of the engine as the aircraft impacted a large tree before crashing onto a road.
Probable cause:
Wreckage examination revealed that the fuel selectors for both engines were set at the auxiliary tank positions, causing fuel for each engine to be drawn from the corresponding auxiliary tank in each wing. It was established that the aircraft had been refuelled to full main tanks prior to the flight. Further, the pilot had advised in a telephone conversation with an engineer before the flight that the contents of both auxiliary tanks was 60 litres or less. All fuel tanks except the left auxiliary tank were ruptured during the impact sequence. About one litre of fuel was recovered from this
tank. Examination of the aircraft engines indicated that the right engine was under power at impact while the left engine was not. The mechanical condition of the engines indicated that they were capable of normal operation.
The following factors are considered relevant to the development of the accident:
- The pilot did not use a written checklist.
- The pilot operated the aircraft with the auxiliary tanks selected when the fuel contents of these tanks was low.
- The pilot failed to conduct a forced landing.
Final Report:

Crash of a Cessna 402C in Bundaberg: 4 killed

Date & Time: Jun 21, 1987 at 0318 LT
Type of aircraft:
Operator:
Registration:
VH-WBQ
Flight Phase:
Flight Type:
Survivors:
Yes
Schedule:
Bundaberg - Brisbane
MSN:
402C-0627
YOM:
1982
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
4
Pax fatalities:
Other fatalities:
Total fatalities:
4
Circumstances:
The flight had been arranged to transport a critically injured patient to hospital in Brisbane. The pilot evidently experienced some difficulty in starting one of the engines. However, witnesses reported that the engines sounded normal as the aircraft commenced moving from the parking area. At 0310 hours the pilot contacted Brisbane Flight Service Unit and reported that the aircraft was taxying. He advised that he was in a hurry, and indicated that he would provide details of the flight after takeoff. Two minutes later he advised that takeoff was being commenced from Runway 14. No further transmissions were received from the aircraft. The aircraft was seen to become airborne and shortly afterwards enter a fog bank. Other witnesses subsequently reported hearing the sounds of an impact. The flight had been arranged to transport a critically injured patient to hospital in Brisbane. The pilot evidently experienced some difficulty in starting one of the engines. However, witnesses reported that the engines sounded normal as the aircraft commenced moving from the parking area. At 0310 hours the pilot contacted Brisbane Flight Service Unit and reported that the aircraft was taxying. He advised that he was in a hurry, and indicated that he would provide details of the flight after takeoff. Two minutes later he advised that takeoff was being commenced from Runway 14. No further transmissions were received from the aircraft. The aircraft was seen to become airborne and shortly afterwards enter a fog bank. Other witnesses subsequently reported hearing the sounds of an impact. The flight had been arranged to transport a critically injured patient to hospital in Brisbane. The pilot evidently experienced some difficulty in starting one of the engines. However, witnesses reported that the engines sounded normal as the aircraft commenced moving from the parking area. At 0310 hours the pilot contacted Brisbane Flight Service Unit and reported that the aircraft was taxying. He advised that he was in a hurry, and indicated that he would provide details of the flight after takeoff. Two minutes later he advised that takeoff was being commenced from Runway 14. No further transmissions were received from the aircraft. The aircraft was seen to become airborne and shortly afterwards enter a fog bank. Other witnesses subsequently reported hearing the sounds of an impact. The investigation revealed that the aircraft had collided with a tree 800 metres beyond the aerodrome boundary, while tracking about 10 degrees to the right of the extended centreline of the runway. It had then continued on the same heading until striking the ground 177 metres beyond the initial impact point. The wreckage was almost totally consumed by fire.
Probable cause:
The extensive fire damage hampered the investigation of the accident. The surviving passenger believed that the aircraft was on fire before the collision with the tree. No other evidence of an in-flight fire could be obtained, and it was considered possible that the survivor's recall of the accident sequence had been affected by the impact and the fire. Such discrepancies in recall are not uncommon among accident survivors. The elevator trim control jack was found to be in the full nose-down position, but it was not possible to establish whether the trim was in this position prior to impact. Such a pre-impact position could indicate either a runaway electric trim situation or that, in his hurry to depart, the pilot had not correctly set the trim for takeoff. The aircraft was known to have had an intermittent fault in the engine fire warning system. The fault apparently caused the fire warning light to illuminate, and the fire bell to sound, usually just after the aircraft became airborne. The pilot was aware of this fault. It was considered possible that, if the fault occurred on this occasion as the aircraft entered the fog shortly after liftoff, the pilot's attention may have been focussed temporarily on the task of cancelling the warnings. During this time he would not have been monitoring the primary flight attitude indicator, and would have had no external visual references. It was also possible that, if for some reason the pilot was not monitoring his flight instruments as the aircraft entered the fog, he suffered a form of spatial disorientation known as the somatogravic illusion. This illusion has been identified as a major factor in many similar accidents following night takeoffs. As an aircraft accelerates, the combination of the forces of acceleration and gravity induce a sensation that the aircraft is pitching nose-up. The typical reaction of the pilot is to counter this apparent pitch by gently applying forward elevator control, which can result in the aircraft descending into the ground. In this particular case, the pilot would probably have been more susceptible to disorientating effects, because he was suffering from a bronchial or influenzal infection. Although all of the above were possible explanations for the accident, there was insufficient evidence available to form a firm conclusion. The precise cause of the accident remains undetermined.
It is considered that some of the following factors may have been relevant to the development of the accident
1. The pilot was making a hurried DEPARTURE. It is possible that he did not correctly set the elevator trim and/or the engines may not have reached normal operating temperatures before the takeoff was commenced.
2. Shortly after liftoff the aircraft entered a fog bank, which would have deprived the pilot of external visual references.
3. The aircraft had a defective engine fire warning system. Had the system activated it may have distracted the pilot at a critical stage of flight.
4. The aircraft might have suffered an electric elevator trim malfunction, or an internal fire, leading to loss of control of the aircraft.
5. The pilot may have experienced the somatogravic illusion and inadvertently flown the aircraft into the ground. The chances of such an illusion occurring would have been increased because the pilot was evidently suffering from an infection.
Final Report:

Crash of an IAI 1124 Westwind off Sydney: 2 killed

Date & Time: Oct 10, 1985 at 0059 LT
Type of aircraft:
Operator:
Registration:
VH-IWJ
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Sydney – Brisbane – Cairns
MSN:
371
YOM:
1982
Flight number:
QH474
Country:
Region:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
9881
Captain / Total hours on type:
3101.00
Copilot / Total flying hours:
8091
Copilot / Total hours on type:
500
Aircraft flight hours:
3105
Circumstances:
IAI 1124 Westwind aircraft, registered VH-IWJ, was operating under a current Certificate of Registration, the holder of which was Pel-Air Aviation Pty Ltd (Pe1-Air). The aircraft was operated by Pel-Air and, at the time of the accident, it was engaged on a regularly scheduled cargo service. This service was operated under the terms of a current Charter and Aerial Work Licence, and was flown on behalf of Ansett Air Freight, a subsidiary of Ansett Transport Industries Pty Ltd. The particular flight, designated Flight 474, was operated on 4 nights each week from Sydney to Brisbane and Cairns, Queensland. The aircraft had departed Cairns earlier in the evening and had flown via Brisbane to Sydney, arriving at 2336 hours. The arriving crew reported that the aircraft was performing normally. A total of 1,350 litres of fuel was added to the aircraft tanks and loading of general cargo was carried out by Ansett Air Freight personnel. The flight plan submitted to Air Traffic Control (ATC) indicated that the flight would follow the normal Instrument Flight Rules (IFR) procedures. The estimated time interval to Brisbane was 70 minutes at planned Flight Level 370 (approximate altitude of 37,000 feet). The aircraft carried sufficient fuel for 164 minutes of flight, and refuelling was planned to take place at Brisbane prior to departure for Cairns. Pel-Air intended to use the flight to assess the performance of the rostered co-pilot, who was being considered for upgrading to command status. He was to occupy the left hand control seat, while the right hand seat occupant was the Chief Pilot of the company. At 0033 hours the crew established radio contact on the Sydney ATC Clearance Delivery frequency, and were given a "16 West Maitland One" Standard Instrument Departure (SID). The flight pattern associated with this clearance requires the aircraft to maintain heading after take-off on Runway 16 until reaching a height of 500 feet, when a left turn is made to intercept the 126 radial of the Sydney VOR (Very High Frequency Omnidirectional Range). At a position of 6 nautical miles by Distance Measuring Equipment (DME) from the aerodrome, a left turn onto 357 degrees is made in order to continue tracking with reference to the West Haiti and VOR. A copy of the applicable SID chart is shown at Appendix A. Shortly before 0049 hours the crew contacted Sydney Control Tower, and the aircraft was directed to taxi for a departure from Runway 16. At the time the wind was light and variable. After receiving the appropriate clearance, an evidently normal take-off was made, and at 0056 hours contact was established with Sydney Departures Control. The pilot in command advised that the aircraft was on climb to Flight Level 370 , and requested the direct track to Brisbane. This was a standard request, to allow the aircraft to proceed directly to the destination rather than follow the various radio navigation aids along the route. Such a request was normally granted by ATC if the general traffic situation permitted use of the direct track, and provided the aircraft was equipped with a suitable navigation system. VH-IWJ was fitted with a VLF/Omega navigation system which was capable of direct tracking. After ascertaining this, the Departures controller advised the aircraft that the direct track to Brisbane would probably be available. The acknowledgment of this comment was the last recorded transmission from the aircraft. Shortly before 0059 hours the Departures controller broadcast the clearance for the aircraft to track direct to Brisbane at the planned cruising level. No response was received from the aircraft, although the controller noted that radar returns were still visible on his screen. Shortly afterwards, these returns faded, and the Distress Phase of Search and Rescue procedures was Instituted at 0100 hours. At about this time, a number of persons observed what appeared to be the lights of an aircraft descending rapidly towards the sea. The lights maintained their position relative to each other, indicating that the aircraft was not rotating as it descended. The aircraft had faded from the radar screen at a point about 11 kilometres south-east of Sydney Airport. A search of the area was commenced using helicopters and boats. Wreckage Identified as being from the aircraft was sighted by a helicopter at 0245 hours. Recovery of pieces of the aircraft structure, freight and human remains was effected by Police and Department of Aviation launches. The degree of destruction indicated that the aircraft had struck the water while travelling at high speed. The bulk of the wreckage was presumed to be lying in about 85 metres of water about 5 kilometres out to sea from Botany Bay. An Intensive search was carried out by vessels from the Royal Australian Navy, later assisted by a vessel from the NSW Department of Fisheries and Agriculture. Use was made of various underwater detection devices. Search efforts were hampered by persistent unfavourable sea conditions and no trace was found of the wreckage. Operations were finally suspended towards the end of November 1985. An Internationally recognised underwater location and salvage expert was then employed, and the wreckage was ultimately located and identified in 92 metres of water on 20 January 1986. Recovery of the Flight Data and Cockpit Voice Recorders, the major portions of both engines, and sundry other pieces of the aircraft structure, was effected the following month.
Probable cause:
The following findings were reported:
1.There was a known malfunction of the rate of turn indicator.
2. The pilot in command possibly simulated simultaneous failures of all three flight attitude indicators.
3. There were no external references by which the crew could assess the attitude of the aircraft.
4. A loss of control of the aircraft occurred at a height of about 5000 feet.
5. The crew did not recover control of the aircraft prior to impact with the sea.
Final Report:

Crash of a Douglas DC-4-1009 in Brisbane: 2 killed

Date & Time: May 24, 1961 at 0435 LT
Type of aircraft:
Operator:
Registration:
VH-TAA
Flight Type:
Survivors:
No
Schedule:
Sydney – Brisbane
MSN:
43065
YOM:
1946
Flight number:
TN1902
Country:
Region:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
13019
Captain / Total hours on type:
378.00
Aircraft flight hours:
46006
Circumstances:
The crew was completing a cargo flight from Sydney to Brisbane. On short final in good weather conditions, the four engine aircraft crashed in unknown circumstances. The wreckage was found few hours later at Bulwer Island, about 1,5 km southeast of runway 01 threshold. The aircraft was destroyed by impact forces and a post crash fire and both pilots were killed.
Probable cause:
The accident occurred during the pre-landing circuit when the captain tried to leave his seat under the influence of a disordered cardiac function and, in the course of so doing, collapsed across the engine control console in such a way as to bring all four throttle levers to the closed position depriving the first officer of the throttle movement necessary to avoid a crash-landing off the airport.
Final Report:

Crash of an Avro 694 Lincoln 31 on Mt Superbus: 6 killed

Date & Time: Apr 9, 1955 at 0414 LT
Type of aircraft:
Operator:
Registration:
A73-64
Flight Phase:
Flight Type:
Survivors:
No
Site:
Schedule:
Townsville – Brisbane
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
2
Pax fatalities:
Other fatalities:
Total fatalities:
6
Circumstances:
10 Squadron RAAF had received a telephone call late on Good Friday night from the Townsville hospital seeking an emergency evacuation to Brisbane of a critically jaundiced 2 day old baby, Robyn Huxley. As most of the Squadron's air crew were on leave or stand-down over Easter, the Commanding Officer of 10 Squadron, Wing Commander John Costello decided to pilot the Squadron's only serviceable aircraft, A73-64, for the evacuation flight. The crew consisted of the new Commanding Officer Wing Commander Costello who had flown Sunderlands during the war against the German U Boats in the Atlantic, the Senior Navigation Officer, Squadron Leader Finlay, who was a wartime Pathfinder navigator, the squadron Chief Signaler, Flight Lieutenant Cater, and the squadron Senior Engineering Officer, Squadron Leader Mason. The baby girl and nurse Mafalda Gray were positioned in the long-nosed section of the Lincoln bomber. The aircraft took off from Garbutt airfield at 00.30 am on Saturday 9 April 1955. The aircraft encountered some cloud and rain as it approached southern Queensland. The aircraft had to fly at a relatively low altitude to ensure the baby had a comfortable flight. At 4.05 am the aircraft contacted Brisbane Air Traffic Control to advise that they were flying in cloud at 6,000 feet. They advised that they would arrive in Brisbane in about 10 minutes time and sought a clearance to reduce altitude to 5,000 feet. Brisbane Air Traffic Control advised that they were cleared to drop to 5,000 feet and if they wished they could drop to 4,000 feet for the approach to Eagle Farm airfield. A short time later Brisbane Air Traffic Control contacted them with weather information and asked them to confirm when they had obtained a visual fix on the town of Caboolture. No further reports were heard from the Lincoln bomber. There were no low clouds in the Brisbane area at that time. Some time later, reports came in that an aircraft, later confirmed as a Lincoln, was heard to circle over the town of Bell at about 3.30 am. Bell is located about 18 miles north east of Dalby. Clearly A73-64 was well off course. The weather south of Bell was overcast with scattered rain. At 4.14 am some members of the Brisbane Bushwalking Club heard a large aircraft fly overhead followed by the noise of an impact and some large explosions. By their estimation it had slammed into a nearby mountain in the Main Range region of the Border Ranges near Emu Vale. This was later confirmed to be Mount Superbus, the highest mountain (1,375 meters) in southern Queensland. A small group from the Bushwalking club was dispatched immediately to Emu Vale to notify the relevant authorities. Five hours later a Canberra bomber from Amberley airbase was able to confirm the location of the still burning wreckage of Lincoln, A73-64 just below the summit of Mount Superbus. Ground rescue crews were dispatched to the site. They quickly confirmed that there were no survivors.
Crew (10th Squadron):
W/Cdr John Peter Costello, pilot,
S/Ldr Charles Surtees Mason, copilot,
S/Ldr John Watson Finlay, navigator,
F/Lt William George Stanley Cater, signaler.
Passengers:
Baby Robyn Huxley,
Sister Mafalda Gray.
Source: http://www.ozatwar.com/ozcrashes/superbus.htm